EX-99.1 2 exhibit99-1.htm TECHNICAL REPORT ON THE TOPA MINE Great Panther Silver Limited - Exhibit 99.1 - Filed by newsfilecorp.com

GREAT PANTHER SILVER LIMITED

TECHNICAL REPORT ON THE
TOPIA MINE, STATE OF DURANGO,
MEXICO

NI 43-101 Report

 

Author:
David W. Rennie, P.Eng.

March 28, 2011
ROSCOE POSTLE ASSOCIATES INC.




Report Control Form  
   
Document Title Technical Report on the Topia Mine, State of Durango, Mexico
   
Client Name & Address


Great Panther Silver Limited
Suite 2100, 1177 West Hastings Street
Vancouver, British Columbia
V6E 2K3

Document Reference

Project # 1583
Status &
Issue No.
Final
Version
       
Issue Date March 28, 2011    

Lead Author

David W. Rennie

 

  (Signed)
       
Peer Reviewer

Deborah A. McCombe

 

  (Signed)
       
Project Manager Approval

Richard J. Lambert

 

  (Signed)
       
Project Director Approval


(name)



(signature & date)

Report Distribution Name No. of Copies
     
Client  
   
RPA Filing 1 (project box)

Roscoe Postle Associates Inc.
1130 West Pender Street, Suite 388
Vancouver, British Columbia V6E 4A4
Canada
Tel: +1 604 602 6767
Fax: +1 604 602 0235
mining@rpacan.com


 
  www.rpacan.com

TABLE OF CONTENTS

  PAGE
1   SUMMARY 1-1
      Executive Summary 1-1
      Technical Summary 1-5
2   INTRODUCTION 2-1
3   RELIANCE ON OTHER EXPERTS 3-1
4   PROPERTY DESCRIPTION AND LOCATION 4-1
5   ACCESSIBILITY, CLIMATE, LOCAL RESOURCES, INFRASTRUCTURE AND PHYSIOGRAPHY 5-1
6   HISTORY 6-1
7   GEOLOGICAL SETTING 7-1
      Regional Geology 7-1
      Local Geology 7-1
      Property Geology 7-3
8   DEPOSIT TYPES 8-1
9   MINERALIZATION 9-1
10 EXPLORATION 10-1
11 DRILLING 11-1
12 SAMPLING METHOD AND APPROACH 12-1
13 SAMPLE PREPARATION, ANALYSES AND SECURITY 13-1
14 DATA VERIFICATION 14-1
15 ADJACENT PROPERTIES 15-1
16 MINERAL PROCESSING AND METALLURGICAL TESTING 16-1
17 MINERAL RESOURCE AND MINERAL RESERVE ESTIMATES 17-1
      Mineral Resources 17-1
      Mineral Reserves 17-21
18 OTHER RELEVANT DATA AND INFORMATION 18-1
19 INTERPRETATION AND CONCLUSIONS 19-1
20 RECOMMENDATIONS 20-1
21 REFERENCES 21-1
22 DATE AND SIGNATURE PAGE 22-1
23 CERTIFICATE OF QUALIFIED PERSON 23-1
24 APPENDIX 1 24-1
      List of Mineral Tenures 24-1

Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page i



  www.rpacan.com

25 APPENDIX 2 25- 1
  Sample Statistics 25- 1
26 APPENDIX 3 26- 1
  Mineral Resource Tables By Zone 26- 1
27 APPENDIX 4 27- 1
  Modeled Variogram Results 27- 1

LIST OF TABLES

LIST OF FIGURES

  PAGE
   
Figure 4- 1     Location Map 4-2
Figure 4- 2     Property Tenures 4-3
Figure 7- 1     Regional Geology 7-2
Figure 7- 2     Property Geology 7-4
Figure 11- 1   Drill Plan 11- 3
Figure 16- 1   Mill Flow Sheet 16-3
Figure 17- 1   Cutting Curve For Silver – San Miguel Vein 17-9
Figure 17- 2   Example Longitudinal Projection – Argentina West 17-20

Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page ii



  www.rpacan.com

LIST OF APPENDIX FIGURES & TABLES

  PAGE
   
Table A 24- 1   List of Topia Mineral Tenures 24- 2
Table A 25- 1   Chip Sample Statistics - Silver 25- 2
Table A 25- 2   Chip Sample Statistics - Gold 25- 2
Table A25- 3   Chip Sample Statistics - Lead 25- 3
Table A 25- 4   Chip Sample Statistics - Zinc 25- 3
Table A 26- 1   Measured Mineral Resources 26- 2
Table A 26- 2   Indicated Mineral Resources 26- 3
Table A 26- 3   Inferred Mineral Resources 26- 4
Figure A 27-1   Correlogram For Ag X L – Horiz. Dir. 27- 2
Figure A 27-2   Correlogram For Ag X L – Vert. Dir 27- 2
Figure A 27-3   Correlogram For Au X L – Horiz. DIr 27- 3
Figure A 27-4   Correlogram For Au X L – Vert. DIr 27- 3
Figure A 27-5   Correlogram For Pb X L – Horiz. Dir. 27- 4
Figure A 27-6   Correlogram For Pb X L – Vert. Dir 27- 4
Figure A 27-7   Correlogram For Zn X L – Horiz. Dir. 27- 5
Figure A 27-8   Correlogram For Zn X L – Vert. Dir. 27- 5
Figure A 27-9   Correlogram For True Width – Horiz. Dir. 27- 6
Figure A 27-10 Correlogram For True Width – Vert. Dir 27- 6

Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page iii



  www.rpacan.com

1 SUMMARY

EXECUTIVE SUMMARY

Roscoe Postle Associates Inc. (RPA) was retained by Great Panther Silver Limited (GPR) to prepare an estimate of Mineral Resources and an independent Technical Report on the Topia property (the Property), in Durango State, Mexico. The purpose of this Technical Report is to support GPR’s public disclosure related to the ongoing Topia mining and milling operations. This Technical Report conforms to National Instrument 43-101 Standards of Disclosure for Mineral Projects (NI 43-101). Scott Wilson RPA visited the Property on September 23 to 25, 2010.

GPR is engaged in the exploration, development, and production of mineral properties, primarily silver. It is a junior silver producing company with operating silver mines in Mexico. In addition to the Property, GPR owns and operates the Guanajuato silver mine and mill complex located in the Guanajuato, Mexico.

The Property encompasses several small underground silver-gold-lead-zinc mines along with a 200 tonnes per day (tpd) processing plant located in and around the town of Topia, Mexico. The deposits in the Topia area have been mined intermittently since the 16th century. GPR purchased the Property in 2005, refurbished and recommissioned the mill, rehabilitated underground workings, and resumed operations. GPR has carried out exploration and continues to explore the Property. At the time of the visit, the mill was operating seven days per week at a rate of 175 tpd, treating ores from GPR’s mines as well as from other independent operators.

Currently, the major assets and facilities associated with the Property are:

 

Measured and Indicated Mineral Resources estimated to contain 171,000 tonnes grading 864 g/t Ag, 1.56 g/t Au, 7.53% Pb, and 4.37% Zn plus Inferred Mineral Resources estimated to contain 285,000 tonnes grading 868 g/t Ag, 1.5 g/t Au, 6.5% Pb, and 3.7% Zn.

   

 

An underground mining operation producing approximately 135 tpd from up to fourteen mines on 11 separate veins using conventional and mechanized mining methods, including resuing.

   

 

The resource estimate has been prepared for seven of the 11 veins being exploited plus the La Prieta vein where a new development is planned.


Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page 1-1



  www.rpacan.com

 

A flotation concentrator, which at the time of the site visit was operating at an average rate of approximately 175 tpd, to produce two separate concentrates: a silver-rich lead concentrate and a zinc concentrate. RPA has been informed that modifications have been made to the concentrator since the visit such that it is now capable of 275 tpd.

   

 

Extensive underground workings including adits for access, as well as raises, sub-levels, and ramps.

Mineral Resources have been estimated for the following zones:

 

Argentina

       
 

o

Central

       
 

o

East

       
 

o

Footwall

       
 

o

Santa Cruz

       
 

o

West

       
 

Hormiguera (Cantarranas)

       
 

Don Benito

       
 

o

La Dura North

       
 

o

La Dura South

       
 

o

La Dura West

       
 

La Prieta

       
 

Recompensa

       
 

El Rosario

       
 

San Gregorio

       
 

San Jorge

CONCLUSIONS

RPA has carried out an estimate of the Mineral Resources for the Topia property. The estimate is summarized in Table 1-1.

RPA concludes that:

  • The sampling conducted by GPR is appropriate for the deposit type and mineralization style. Reasonable and practical steps are taken to ensure security of the samples. RPA notes, however, that some channel sample widths are unreasonably low and that a practical minimum sampling width should be maintained.

Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page 1-2


  www.rpacan.com
  • Diamond drilling, logging, and core handling are being carried out in a reasonable fashion, consistent with industry best practice.

  • Assaying is being conducted using conventional methods, in facilities that are properly configured and managed. Performance of the laboratory is being monitored by both internal quality assurance/quality control (QA/QC) protocols and comparison with an external laboratory.

  • Some of the duplicate results indicate that there may be biases for analyses in the lower grade ranges for gold and silver. The evidence is somewhat ambiguous, however, as it is not consistent between core and pulp duplicates. Continued monitoring of the laboratory, in accordance with current industry best practice guidelines, should be maintained.

  • The sample database is observed to contain several errors of low severity. Improved validation is required for the data capture process.

  • Appropriate safeguards are in place to ensure that the database is reasonably secure.

  • The grade estimate for zinc is conservatively biased owing to a lack of assay data in many areas.

  • There is potential for discovery of additional Mineral Resources at Topia through exploration and development.

TABLE 1-1 TOPIA MINERAL RESOURCES - OCTOBER 31, 2010
Great Panther Silver Limited - Topia Mine

Class Tonnage Ag Au Pb Zn
  (t) (g/t) (g/t) (%) (%)
Measured 57,700 825 1.67 7.57 4.97
Indicated 113,000 883 1.50 7.50 4.06
           
M & I 171,000 864 1.56 7.53 4.37
           
Inferred 285,000 868 1.5 6.5 3.7

Notes:

  1.

CIM definitions were followed for Mineral Resources.

  2.

The Qualified Person for this Mineral Resource estimate is David W. Rennie, P.Eng.

  3.

Mineral Resources are estimated at an NSR cut-off of US$130/t.

  4.

Mineral Resources are estimated using metal prices of US$1,200/oz Au, US$21.00/oz Ag, US$1.00/lb Pb, and US$1.10/lb Zn.

  5.

A minimum mining width of 0.30 metres was used.

  6.

Numbers may not add due to rounding.

RECOMMENDATIONS

RPA makes the following recommendations:

  • GPR should continue mining operations at Topia.

Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page 1-3


  www.rpacan.com
  • Exploration should continue in order to expand the resource base.

  • Assay QA/QC protocols should be maintained to ensure that the results produced by the Topia laboratory are accurate and unbiased. This should include regular and prompt review of QA/QC results. RPA notes that an independent review of the laboratory has been initiated and considers this to be good practice. RPA recommends that some level of independent monitoring be maintained.

  • The data capture for the channel sampling should be standardized and validation protocols should be enhanced to reduce the number of errors in the database.

  • A reasonable minimum sample width for the channels should be established and maintained.

RPA notes that GPR plans to continue surface drilling on a number of the vein systems at Topia. A total of 7,210 m in 55 holes are planned for the immediate Topia area, as well as 350 m of drilling in five holes at La Cuñita, which is a prospect located 15 km from Topia. A budget for this drilling is provided in Table 1-2 below. In RPA’s opinion, this work is warranted, and RPA recommends that it be carried out.

TABLE 1-2 EXPLORATION BUDGET
Great Panther Silver Limited - Topia Mine

Budget Item     Amount (US$)
Drilling Topia 7,210 m @ $100/m 721,000
  La Cuñita 350 m @ $100/m 35,000
       
Geology   $25,000/mo @ 5 months 125,000
       
Assays   700 @ $15 ea 10,500
       
Supervision     10,000
       
Subtotal     901,500
Contingency (15%)     135,225
Total     1,036,725
       
Say     1,000,000

Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page 1-4



  www.rpacan.com

TECHNICAL SUMMARY

PROPERTY DESCRIPTION AND LOCATION

The Property is situated in and surrounding the town of Topia, Durango State, Mexico, approximately 235 km northwest of Durango and 100 km northeast of Culiacán. The Topia mill and office complex is located at approximately 25° 12' 54" N latitude and 106° 34' 20" W longitude.

LAND TENURE

The Property encompasses 53 contiguous concessions that cover approximately 6,258 ha in area. GPR holds a 100% interest in the Property through its wholly owned Mexican subsidiary, Minera Mexicana El Rosario, S.A. de C.V. (MMR).

SITE INFRASTRUCTURE

The surface and underground infrastructure at the Property includes the following:

  • Multiple adits from surface as well as ramps, raises, drifts, cross-cuts, and sub- levels

  • Conventional and mechanized underground mining equipment

  • Mine ventilation, dewatering, and compressed air facilities

  • Mine, geology, processing, and administrative offices

  • A nominal 275 tpd flotation concentrator with surface bins and crushing facilities

  • A tailings impoundment facility

  • Connection to the national grid for the supply of electric power

HISTORY

Mining was first reported in the area in 1538, and continued more or less continuously into the 20th century. Compania Minera Peñoles, S.A. (Peñoles) acquired the mines in the district in 1944 and completed the construction of a flotation plant in 1951. Peñoles operated at Topia from 1951 to 1990 when the operations were shut down due to low metal prices and labour pressures. Compania Minera de Canelas y Topia acquired and operated the mine until 1999. GPR acquired the Property in 2005, refurbished mill, rehabilitated the mines, conducted exploration programs, and resumed production.

Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page 1-5


  www.rpacan.com

GEOLOGY

The Topia district lies within the Sierra Madre Occidental (SMO), a north-northwest-trending belt of Eocene to Miocene age flows and tuffs of basaltic to rhyolitic composition with related intrusive bodies. The Property is underlain by a kilometre-thick package of Cretaceous and Tertiary andesite lavas and pyroclastic rocks which are, in turn, overlain by younger rhyolitic flows and pyroclastics. The volcanic sequence is transected by numerous faults, some of which host the mineralized veins in the district. There are two sets of faults: one striking 320° to 340° and dipping northeast and the other striking 50° to 70° and dipping steeply southeast to vertically. The northeast-trending faults are the principal host structures for precious and base metal mineralization.

The mineral deposits at Topia are adularia-sericite-type, silver-rich, polymetallic epithermal veins. Silver-gold-lead-zinc mineralization is found in fissure-filling veins along sub-parallel faults. Mineralization within the veins consists mainly of massive galena, sphalerite, and tetrahedrite in a gangue quartz, barite, and calcite. The vein constituents often include adularia and sericite, and the wider fault zones contain significant proportions of clay as both gouge and alteration products.

MINERAL RESOURCES

The estimate was prepared using a combination of polygons and 2D block models. The block models comprised vertical 2D arrays of blocks measuring 2.5 m x 2.5 m in size, oriented roughly parallel to the strike of the veins. Values for accumulated metal for Ag, Au, Pb, and Zn, as well as true width were estimated into each block. The block grades were calculated by dividing the estimated accumulated metal “grade” by the estimated true width. Volumes were derived from the area of each block multiplied by the estimated width, and tonnages were calculated from the product of the volume and the estimated bulk density.

Resource “panels” were manually drawn on the longitudinal projections based on the sample grades, resource class, and the interpolated block grades. The panels were configured to encompass contiguous sections of material with net smelter return (NSR) values of US$130/t or greater. Panel grades were estimated by averaging the blocks within the panel outlines.

The effective date of the estimate is October 31, 2010.

Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page 1-6


  www.rpacan.com

The Mineral Resources reside within 14 individual zones on eight separate vein systems located throughout the Topia area. These zones are listed below:

 

Argentina

       
 

o

Central

       
 

o

East

       
 

o

Footwall

       
 

o

Santa Cruz

       
 

o

West

       
 

Hormiguera (Cantarranas)

       
 

Don Benito

       
 

o

La Dura North

     
 

o

La Dura South

       
 

o

La Dura West

       
 

La Prieta

       
 

Recompensa

       
 

El Rosario

       
 

San Gregorio

       
 

San Jorge

The Mineral Resource estimate is summarized in Table 1-1. There are no Mineral Reserves estimates for the Topia property.

MINING OPERATIONS

For the narrower veins at Topia, mining is by conventional cut and fill stoping with resuing to selectively mine the ore and leave the waste for backfill. Drilling is done with jackleg drills and ore is typically hand mucked in the stope and dropped down timber crib muck passes which are carried upwards as the stoping advances. Ore is hand sorted at the face to leave as much of the waste material as possible in the stope as backfill. From the muck passes the ore is pulled via manual chutes, loaded into small rail cars and hand trammed to a dump at the portal. At the surface ore dump, the ore may again be hand sorted to upgrade the ore before being transported to the processing plant..

In wider areas of the veins, mining is by mechanized cut and fill mining with small 2.0 yd3 load haul dump trucks (LHDs) for development and 1.0 yd3 and 0.7 yd3 LHDs for mucking in the stopes. Development access is via decline. Lifts in the mechanized cut

Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page 1-7


  www.rpacan.com

and fill stope are taken with horizontal holes (breasting). Ore is hauled from the stope by LHD and then loaded into a truck for haulage to the mill.

MINERAL PROCESSING

The mill employs conventional crushing, grinding, and flotation to produce lead and zinc sulphide concentrates. At the date of the visit, the mill was operating at 175 tpd on GPR ore plus custom milling of ore from other mines in the district. The operation runs seven days a week, 24 hours per day, with Sunday day-shift reserved for maintenance. The average head grade processed by the mill from all of 2010 was 458 g/t Ag, 0.61 g/t Au, 3.0% Pb, and 3.9% Zn. The grade of lead concentrate was 8.0 kg/t Ag, 8.0 g/t Au, and 57.5% Pb, while the grade of zinc concentrate was 0.52 kg/t Ag and 52.9% Zn. Overall metal recoveries, determined from the metallurgical balance, were 92% for Ag, 80% for Au, 94% for Pb, and 92% for Zn in the two concentrates.

Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page 1-8


  www.rpacan.com

2 INTRODUCTION

Roscoe Postle Associates Inc. (RPA) was retained by Robert Brown, P. Eng., Vice President Exploration of Great Panther Silver Limited (GPR), to prepare an estimate of Mineral Resources and an independent Technical Report on the Topia property (the Property), near Topia, Durango, Mexico. This Technical Report conforms to National Instrument 43-101 Standards of Disclosure for Mineral Projects (NI 43-101).

GPR is a Canadian-based mining and exploration company active in Mexico. The company has two mining and processing operations, the Topia silver-gold-lead-zinc property in west-central Durango State and the Guanajuato silver-gold mine in Guanajuato State. GPR also has the San Antonio gold-copper project in Chihuahua State, but is not actively exploring it at this time. Total metal production in 2010 from GPR’s operations was 1.53 million oz Ag, 7,216 oz Au, 1,092 t Pb, and 1,358 t Zn (GPR, personal communication, 2011). The Topia operation is the subject of this report.

The Topia mine and mill complex comprises several small-scale operating mines along with a conventional flotation concentrator. Mining in the district dates back to the early 16th century. GPR acquired the property in 2005 and owns a 100% interest through Minera Mexicana El Rosario, S.A. de C.V. (MMR). The principal metals of interest are gold, silver, lead, and zinc. Mineralization occurs in narrow, near-vertical fissure veins, and comprises lead and zinc sulphides with accessory pyrite, in a gangue of predominately quartz, carbonates, and barite. In 2010, Topia produced 515,000 oz Ag, 597 oz Au, 1,092 t Pb, and 1,358 t Zn.

Ore is milled from several localities within GPR’s holdings in the area, as well as on a toll basis for an independent local operator. At the time of the visit to the operations, the plant was running at a rate of 175 tpd. RPA has been informed that modifications have been made to the plant such that it is now capable of 275 tpd. Mining is by conventional and mechanized cut and fill methods, and includes resuing in narrow sections. Ore is often hand sorted before shipment to the mill.

Currently, the major assets and facilities associated with the Topia operation are:

  • Silver-gold- lead-zinc deposits within the known vein systems .

Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page 2-1


  www.rpacan.com
  • The physical plant site including crushing, grinding, flotation and dewatering, the tailings storage facility, mine workings and associated facilities, coarse ore bin, main ventilation fan, workshops, warehouses, administration buildings, and dry facilities.

  • Facilities providing basic infrastructure to the mine, including electric power from the national power grid, heat, water supply from artesian springs, and sewage treatment.

  • Underground infrastructure including drifts, sub-levels, ramps, raises, and mobile equipment fleet.

  • Access by roads to the mill and tailings facility.

RPA has had no prior involvement with GPR or the Topia property. The author of this report is independent of GPR as defined by NI 43-101.

SOURCES OF INFORMATION

David W. Rennie, P.Eng., Principal Geologist with RPA, and R. Dennis Bergen, P.Eng., Associate Principal Mining Engineer with RPA, carried out a site visit on September 23 to 25, 2010. In writing this report, RPA has relied on information provided by GPR in the form of technical reports, production records, financial reports, land tenure documents, drawings, assays, and drilling data.

Discussions were held with personnel from GPR:

  • Robert Brown, P. Eng., Vice President Exploration
  • Charles Brown, Chief Operating Officer
  • Craig Mackay, V.P. Technical Services
  • Adrian Bray, P. Geo., Project Geologist
  • Javier M. Ramirez, Topia General Manager
  • Pedro Reyna Luna, Mine Superintendent
  • Claudio Santiago Canseco, Topia Chief Mine Geologist
  • Ramon Roberto Cruz Felix, Topia Laboratory Manager

The documentation reviewed, and other sources of information, are listed at the end of this report in Section 21, References.

David Rennie is responsible for all sections of this report.

Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page 2-2


  www.rpacan.com

LIST OF ABBREVIATIONS

Units of measurement used in this report conform to the SI (metric) system. All currency in this report is US dollars (US$) unless otherwise noted.

µ micron   kPa kilopascal
°C degree Celsius   kVA kilovolt-amperes
°F degree Fahrenheit   kW kilowatt
µg microgram   kWh kilowatt-hour
A ampere   L litre
a annum   L/s litres per second
bbl barrels   m metre
Btu British thermal units   M mega (million)
C$ Canadian dollars   m2 square metre
cal calorie   m3 cubic metre
cfm cubic feet per minute   min minute
cm centimetre   MASL metres above sea level
cm2 square centimetre   mm millimetre
d day   mph miles per hour
dia. diameter   MVA megavolt-amperes
dmt dry metric tonne   MW megawatt
dwt dead-weight ton   MWh megawatt-hour
ft foot   m3/h cubic metres per hour
ft/s foot per second   opt, oz/st ounce per short ton
ft2 square foot   oz Troy ounce (31.1035g)
ft3 cubic foot   oz/dmt ounce per dry metric tonne
g gram   ppm part per million
G giga (billion)   psia pound per square inch absolute
Gal Imperial gallon   psig pound per square inch gauge
g/L gram per litre   RL relative elevation
g/t gram per tonne   s second
gpm Imperial gallons per minute   st short ton
gr/ft3 grain per cubic foot   stpa short ton per year
gr/m3 grain per cubic metre   stpd short ton per day
hr hour   t metric tonne
ha hectare   tpa metric tonne per year
hp horsepower   tpd metric tonne per day
in inch   US$ United States dollar
in2 square inch   USg United States gallon
J joule   USgpm US gallon per minute
k kilo (thousand)   V volt
kcal kilocalorie   W watt
kg kilogram   wmt wet metric tonne
km kilometre   yd3 cubic yard
km/h kilometre per hour   yr year
km2 square kilometre      

Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page 2-3



  www.rpacan.com

3 RELIANCE ON OTHER EXPERTS

This report has been prepared by Roscoe Postle Associates Inc. (RPA) for Great Panther Silver Limited (GPR). The information, conclusions, opinions, and estimates contained herein are based on:

  • Information available to RPA at the time of preparation of this report,

  • Assumptions, conditions, and qualifications as set forth in this report, and

  • Data, reports, and other information supplied by GPR and other third party sources.

For the purpose of this report, RPA has relied on ownership information provided by GPR. GPR provided a legal opinion on the land tenure. The mineral claims legal opinion was prepared by Jose Enrique Rodriguez del Bosque, RB Abogados, Mexico City, Mexico dated March 10, 2011 and addressed to KPMG, Vancouver, B.C., Canada and Great Panther Silver Ltd. This information is used in Section 4 of this technical report.

RPA has not researched property title or mineral rights for the Topia property and expresses no opinion as to the ownership status of the property.

RPA has relied on GPR for guidance on applicable taxes, royalties, and other government levies or interests, applicable to revenue or income from the Project.

Except for the purposes legislated under provincial securities laws, any use of this report by any third party is at that party’s sole risk.

Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page 3-1


  www.rpacan.com

4 PROPERTY DESCRIPTION AND LOCATION

The Property is situated in and surrounding the town of Topia, Durango State, Mexico, approximately 235 km northwest of Durango and 100 km northeast of Culiacán (Figure 4-1). The Property encompasses 53 contiguous concessions that cover approximately 6,258 ha in area (Figure 4-2). The Topia mill and office complex is located at approximately 25° 12' 54" N latitude and 106° 34' 20" W longitude.

LAND TENURE

GPR holds a 100% interest in the Property through its wholly owned Mexican subsidiary, Minera Mexicana El Rosario, S.A. de C.V. (MMR). The concessions that comprise the GPR holdings at Topia are shown in Figure 4-2 and a list of the tenures is provided in Appendix 1. In February 2005, GPR exercised its option to acquire a 100% interest in the Topia exploitation concessions. Upon signing of the formal purchase agreement on June 30, 2005, GPR made payments totalling approximately US$540,000 to Minera de Canelas y Topia S.A. de C.V., the Vendor, and to two divisions of Compania Minera Peñoles, S.A. (Peñoles), these latter payments being part of the assumed debt. A further payment of US$300,000 was made to the Vendor in August 2006 and regular payments are made to Peñoles with each shipment of concentrate in order to pay down the debt. The balance (approximately US$1 million) of the US$2.65 million purchase price was paid out of the proceeds of production. In addition to the claims, the option to purchase agreement included the mill, buildings, offices, houses, and workers’ quarters, as well as some underground mining equipment and surface vehicles. There is no underlying royalty on the Property.

Environmental protection regulations in Mexico are described as similar to those in North America. Permits are required for new mine operations, specifically, in order to operate a concentration plant as well as for the hydraulic discharge of tailings and changes to grandfathered projects. There are four government departments that deal with and regulate such affairs.

All permits are in place for the Topia Mine operation. RPA has not reviewed the environmental permits at Topia, and have relied on information provided by GPR.

Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page 4-1






  www.rpacan.com

5 ACCESSIBILITY, CLIMATE, LOCAL RESOURCES, INFRASTRUCTURE AND PHYSIOGRAPHY

ACCESSIBILITY

Topia is situated in the Sierra Madre Mountains in the State of Durango, Mexico. Ground access is via 350 km of paved and gravel road from the city of Durango. Travel is north from Durango via Highway 23 to Santiago Papasquiaro, and west to Topia. Total travel time is reported to be eight hours. Small aircraft flights from Culiacán service the town of Topia on a daily basis.

CLIMATE

The climate is generally dry for most of the year, with a wet season from June to September, during which time 200 mm to 500 mm of rain may fall. The annual mean temperature is 16.8°C, but winters can be cool with frosts and light snow, particularly at higher elevations. Exploration and mining work can be conducted year-round uninterrupted by weather.

LOCAL RESOURCES

Topia is a relatively small town of approximately 3,500 people, however, many have worked in the mines and there is a good local source of labour. The town is serviced by road, air service, power grid, and telephone. There are restaurants, hotels, and medical services but no bank or ATMs. GPR maintains a satellite telecommunication system for telephone and the Internet. Water is available from numerous springs, streams, and adits.

INFRASTRUCTURE

The surface and underground infrastructure at the Topia Mine includes the following:

  • Extensive underground workings

  • Multiple adits from surface as well as raises, drifts, cross-cuts, sub-levels, and ramps

Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page 5-1


  www.rpacan.com
  • Mine ventilation, dewatering, and compressed air facilities

  • Conventional and mechanized underground mining equipment

  • Mine, geology, processing, and administrative offices

  • A nominal 275 tpd flotation concentrator with surface bins, crushing facilities, grinding mills, flotation cells, and concentrate dewatering circuit

  • A tailings storage facility

  • Connection to the national grid for the supply of electric power

PHYSIOGRAPHY

The Topia area lies within the Sierra Madre Occidental, in a remote region of rugged terrain. Hillsides are quite steep with elevations ranging from 600 MASL up to over 2,000 MASL.

Vegetation consists of thickly intergrown bush, comprising mesquite, prickly pear, napal, and agave, giving way to pine and oak forest at higher elevations.

Land use in the area is predominantly mining, forestry, and agriculture.

Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page 5-2


  www.rpacan.com

6 HISTORY

The following was taken from a technical report by Orequest, dated November 2003.

Mining in the region predates European colonization, and was first reported in the Topia area in 1538. Orequest (2003) reports that the Spanish first visited the area in 1569, although the website http://www.e-local.gob.mx states that explorers had visited as early as 1532. The first mineral concessions were granted at Topia in the early 1600s. The village was twice destroyed by attacks from indigenous tribes: in 1616 by the Tepehuanos and in 1776 by the Cocoyames.

Production from Topia during the period spanning the latter portion of the 19th century until the Mexican Revolution in 1910 was reportedly between $10 million and $20 million (Loucks, 1988; quoted by Orequest, 2003). This is estimated to have been the equivalent of between 15 million and 30 million oz silver and 25 million to 50 million oz gold.

Peñoles acquired the mines in the district in 1944 and completed the construction of a flotation plant in 1951. Peñoles operated at Topia from 1951 to 1990 when the operations were shut down due to low metal prices and labour difficulties. Mario Macias, then the mine manager for Peñoles, acquired the Topia property and formed Compania Minera de Canelas y Topia to carry on operations. Production for the period 1952 to 1999 totalled 15.4 million oz of silver and 18,500 oz of gold.

The Topia Mine was recently put back into production after a six year hiatus. Up until mid-March 2005, the mill was operating at roughly 25% capacity (50 tpd), processing ore grading 710 g/t Ag, 5.5% Pb, and 6.0% Zn from three levels of the 1522 area of the mine. During the second half of 2005, GPR refurbished and recommissioned the mill and has gradually increased the throughput at the plant to the current 275 tpd. Production from the Property mines (not including third party tolling) in 2010 was 38,281 tonnes with a head grade of 458 g/t Ag, 0.61g/t Au, 3.0% Pb, and 3.9% Zn.

During 2005 and up to present, many of the Property mines have been rehabilitated to re-access the Argentina, La Dura, El Rosario, San Gregorio, San Miguel, San Jorge,

Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page 6-1


  www.rpacan.com

Veta Madre, Cantarranas, Animas, Oliva, and Recompensa veins and resample parts of the veins as part of a due diligence on sampling carried out by Peñoles. This resampling, combined with the sampling carried out by Peñoles, forms a partial basis for the current Mineral Resource estimate.

Since 2006, underground exploration and production channel samples have been collected by GPR from all stopes and development drifts. This work includes much new development along the San Gregorio, El Rosario, Cantarranas, Don Benito, and Recompensa veins. Exploration diamond drilling has been carried out on the various vein systems. This exploration and development work forms the foundation for the resource estimate presented in this report.

Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page 6-2


  www.rpacan.com

7 GEOLOGICAL SETTING

REGIONAL GEOLOGY

The Topia district lies within the Sierra Madre Occidental (SMO), a north-northwest-trending belt of Cenozoic-age rocks extending from the US border southwards to approximately 21° N latitude. The belt measures roughly 1,200 km long by 200 km to 300 km wide. Rocks within the SMO comprise Eocene to Miocene age flows and tuffs of basaltic to rhyolitic composition with related intrusive bodies. The volcanism was associated with subduction of the Farallon Plate and resulted in accumulations of lava and tuffs in the order of one kilometre thickness. Later Basin and Range extensional tectonism related to the opening of the Gulf of California has resulted in block faulting, uplift, and erosion. Strata within the belt occupy a broad antiform, longitudinally transected by regional scale faults.

LOCAL GEOLOGY

The Topia area is underlain by a kilometre-thick package of Cretaceous and Tertiary andesite lavas and pyroclastic rocks which are, in turn, overlain by younger rhyolitic flows and pyroclastics (Figure 7-1). The andesitic rocks are described as dark purple-grey augite andesite tuffs, agglomerates and flows, striking southeast and dipping at 25° to the southwest. This sequence has been divided into three members, which are, from oldest to youngest, the Santa Ana, El Carmen, and Los Hornos (Figure 7-1). Unconformably overlying these rocks is a 600 m thick carapace of flat-lying rhyolite flows and ignimbrites. These felsic rocks form high cliffs to the north of the town of Topia.

A granodiorite stock of Eocene age is exposed five kilometres southwest of Topia. It is accompanied by a propylitic aureole extending outwards for a distance of four kilometres, however, it is not considered to be related to the mineralization in the region. A smaller quartz monzonite intrusive body, measuring 50 m by 100 m, is situated near the Animas vein. This body is hypothesized to be related to a larger, deeper intrusion that is responsible for the epithermal mineralization.

Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page 7-1




  www.rpacan.com

The volcanic sequence is transected by numerous faults, some of which host the mineralized veins in the district. There are two sets of faults, one striking 320° to 340° and dipping northeast and the other striking 50° to 70° and dipping steeply southeast to vertically (Figures 7-1 and 7-2). The northeast-trending faults are the principal host structures for precious and base metal mineralization. The north-northwest-striking faults are observed to disrupt the vein-bearing structures and are sometimes host to post-mineral diabase and rhyolite dikes. These dikes are thought to be feeders to the overlying rhyolitic units.

PROPERTY GEOLOGY

The mineral deposits in the Topia camp are hosted in steeply dipping east-northeast-striking fault zones (Figure 7-2). These fault zones are typically narrow, ranging in width from centimetre- to decimetre-scale. The widest faults are in the Argentina system, where they are observed to be up to three metres wide and accompanied by gouge and intense clay alteration. They are broadly curvi-planar in shape both along strike and down dip, but more or less straight over short, stope-length distances.

Displacements across these structures are thought by mine geologists to be in the order of 50 m to 100 m, in a normal sense, with some rotational component. The faults branch and anastomose in a classic brittle fracture pattern commonly seen in narrow vein settings. Shoots pinch and swell along the trends, but the host structures themselves are observed to be very continuous. The main structures have been traced for as long as four kilometres.

The principal veins systems, from north to south, are the Argentina, Cantarranas/San Jorge, Madre, Don Benito/La Dura, El Ochenta, Animas, Recompensa/Oliva, San Gregorio, and El Rosario (Figure 7-2). GPR is currently carrying out or has recently carried out exploration and development work and is mining on most of these structures.

Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page 7-3




  www.rpacan.com

8 DEPOSIT TYPES

The mineral deposits at Topia are adularia-sericite-type, silver-rich, polymetallic epithermal veins. Silver-gold-lead-zinc mineralization is found in fissure-filling veins along sub-parallel faults cutting andesitic flows, breccias, and pyroclastics. Deposits are usually characterized by multiple veins in areas measuring 10 km2 to 15 km2 with individual veins generally less than two metres in thickness but up to three to four kilometres in length.

Epithermal systems, as the name suggests, form near surface, usually in association with hot springs, and at depths in the order of a few hundred metres. These deposits are commonly formed during the later stages of igneous events and are derived from hydrothermal activity generated from intrusive bodies. Typically, epithermal vein mineralization is initiated several million years after the end of the volcanism that produced the rocks that host the hydrothermal systems and a few million years after the intrusion of the closely associated plutonic rocks. Circulating thermal waters, rising up through fissures, eventually reach the “boiling level” where the hydrostatic pressure is low enough to allow boiling to occur. This can impart a limit to the vertical extent of the mineralization as the boiling and deposition of minerals is confined to a relatively narrow band of thermal and hydrostatic conditions. Mineralization at Topia is reported to occur within a zone spanning 200 m to 300 m in elevation, which is consistent with the epithermal model. Geologists at Topia have, in many instances, been able to define the lower limit of mineralization, and this has been applied as a primary constraint to the Mineral Resource estimate.

The silver to gold ratio in these deposits is generally more than 300:1 and production from these deposit types averages about 500 g/t Ag.

Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page 8-1


  www.rpacan.com

9 MINERALIZATION

Mineralization within the veins consists mainly of massive galena, sphalerite, and tetrahedrite in a gangue of quartz, barite, and calcite. The vein constituents often include adularia and sericite, and the wider fault zones contain significant proportions of clay as both gouge and alteration products. Ore minerals occur as cavity-filling masses, comprising millimetre-scaled crystals of galena and sphalerite. No definitive metal zoning has been discerned, but the lower parts of the mines are reported to contain higher gold content than at higher elevations.

The veins range in thickness from a few centimetres to three metres. They are very continuous along strike, with the main veins extending more than four kilometres. The Madre vein has been mined for 3.5 km and the Cantarranas vein, for 2.4 km. Many of the other veins have been mined intermittently over similar strike lengths. Vertically, the veins grade downward to barren coarse-grained quartz-rich filling and upwards to barren cherty quartz-calcite-barite vein filling. The main host rock is andesite of the Lower Volcanic Series, which is usually competent, making for generally good ground conditions within the mine. In wider sections, with greater clay content and/or zones of structural complexity, ground conditions are less favourable.

Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page 9-1


  www.rpacan.com

10 EXPLORATION

Exploration work carried out at Topia by GPR has comprised diamond drilling, chip sampling, mapping, and underground development. Prior to exercising their option in 2005, GPR conducted a surface diamond drill program consisting of 7,437 m in 30 NQ-size (4.76 cm) holes. The program was carried out on five localities: Las Trancas (on the Cantarranas vein), Don Benito, Hormiguera, Argentina, and El Rosario (Figure 11-1).

Additional details on the drilling programs are provided in Section 11, Drilling of this report.

GPR carried out refurbishment and sampling of underground drifts through 2005 and 2006. A total of 779 samples were taken from the Dos Amigos, La Dura, El Rosario, Cantarranas, and Madre veins. The sampling was successful in confirming earlier sampling work carried out by Peñoles prior to GPR acquiring the Property.

In 2007, surface and underground drilling was conducted at Madre, Argentina, La Dura/Don Benito, Animas, Cantarranas, Oliva, and Recompensa. Total drilling was reportedly 8,293.6 m of NQ core in 40 holes. Underground drift development was carried out on Argentina, La Dura/Don Benito, Animas, Cantarranas, Oliva, Recompensa, and San Gregorio.

Drilling and underground development continued throughout 2008, with the completion of 80 m of drifting at San Gregorio and 55 m at El Rosario. GPR also conducted development along the Argentina vein, ramping down from the 1 level to the 2 level, and driving along the vein for approximately 200 m westward to the Victoria fault (western limit of mineralization). According to GPR, drilling in 2008 totalled 3,586.9 m of NQ and A-size (3.53 cm diameter) core in 35 holes.

Drift, sub-level, and raise development was carried out at San Gregorio, El Rosario, and Don Benito in 2009. Diamond drilling was conducted from surface and underground at Don Benito, Hormiguera, San Gregorio, and Recompensa. Forty-eight NQ and A core diamond holes totalling 3,825.9 m were drilled.

Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page 10-1


  www.rpacan.com

For 2010, GPR planned on drilling 6,000 m to test the extent of the known veins at Recompensa, Cantarranas, La Prieta, Madre, San Gregorio, and El Rosario. As of the closure date of the database, a total of 10,210.3 m of drilling had been completed in 93 NQ and A core holes. By year-end, GPR had drilled 11,412.5 m in 109 holes.

Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page 10-2


  www.rpacan.com

11 DRILLING

As previously stated in Section 10 of this report, GPR has been diamond drilling more or less continuously at Topia since 2004. Table 11-1 summarizes the drilling completed up to the close of the database on October 31, 2010. Drillhole target areas are shown in Figure 11-1.

TABLE 11-1 DIAMOND DRILLING
Great Panther Silver Limited - Topia Mine

                     Surface                  Underground  
Year   Holes   Metres   Holes   Metres  
2004   30   7,437.3   0   0.0  
2005   0   0.0   0   0.0  
2006   4   649.0   10   637.3  
2007   34   7,887.1   6   406.5  
2008   7   2,234.5   28   1,352.4  
2009   23   2,680.5   25   1,145.4  
                   
2010   58   8,992.1   51   2,420.4  
Totals   156   29,880.4   120   5,962.1  

Notes:

  1.

Totals may not agree due to rounding.

Drill programs were planned and supervised by personnel employed by GPR, its subsidiaries and/or contractors. The surface drilling programs conducted from 2004 to 2009 were carried out under contract by BDW Drilling of Guadalajara, Mexico. The 2010 surface drilling was carried out by HD Drilling of San Luis de Potosi, Mexico. Underground drill programs were carried out by Topia Mine drillers. Core logging and collar surveys were carried out by GPR personnel, as well. All surface holes are NQ-size, although some surface holes were collared as HQ (6.35 cm dia.) and reduced to NQ. Underground drill holes are A core size.

Drillhole locations and collar orientations were established by the project geologists and surveyors. Downhole surveys were initially conducted using a Tropari instrument, but more recently a Flexit has been used. The present standard is for downhole surveys to be taken every 50 m. RPA notes that for some of the earlier holes (2004), the spacing

Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page 11-1


  www.rpacan.com

between surveys was significantly broader, and in some cases, only the collar and toe of the holes were surveyed.

The protocol for core handling and logging is as follows:

  • Core is delivered to the core shack daily .

  • Core boxes are laid out, labelled with from and to distances, and footage measurements are checked and converted to metres.

  • Geotechnical logging of rock quality designation (RQD) and recovery is carried out.

  • Core is logged for lithology and marked for sampling.

  • Samples are split using a rock saw and the remaining core is stored for future reference.

Logs, sample intervals, and surveys were entered into a DataShed database using a LogChief logger. The database is managed and validated by GPR mine staff, with the assistance of exploration personnel based in Vancouver.

The core logging and sampling is carried out within a fenced compound at the mill site. Access to the core is restricted to GPR employees or contractors. RPA inspected the core shack and sampling facility and considers it to be adequately equipped and reasonably secure. Core recovery in those sections reviewed by RPA appeared to be good, and the sampling looked to have been done correctly.

RPA notes that not all of the drilling data collected by GPR to date was from the veins included in the Mineral Resource estimate. The database provided to RPA contained records for 213 holes, totalling 25,861.8 m.

Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page 11-2




  www.rpacan.com

12 SAMPLING METHOD AND APPROACH

Sampling comprises both diamond drill and channel samples. Of these, the channels are most important for estimation of Mineral Resources due primarily to the total volume of samples and their spacing. In RPA’s opinion, the drill samples are too broadly spaced to provide reliable grade estimates for the veins. They are, however, very important in locating and projecting the veins, particularly in faulted areas. Drillholes provide a reliable indication of the vein locations, but drifting and raising on vein is required to fully evaluate the quantity and grade of the Mineral Resources.

The channel sampling was done either across the back or at waist height across the drift face using a hammer and moil. The protocol for sample lengths is that they are to be no longer than two metres, however, RPA noted that there were several samples in the database that were longer than that limit. It was also noted that there were a number of samples with recorded widths down to a centimetre. In RPA’s opinion, the sampling protocols should also include a minimum width constraint that reasonably reflects the minimum mining width. Sample spacing is in the order of 1.5 m to 2.5 m in the more densely sampled areas.

The veins tend to be very steeply dipping to vertical, and so these samples are reasonably close to representing the true width of the structure.

Diamond drill samples are taken using a diamond saw to split the core. Sample lengths are constrained to within a minimum of 10 cm and a maximum of two metres.

The total database encompasses three components: diamond drilling, production channel sampling, and the historical Peñoles (former operator) development channel sampling. All three datasets were used in the modelling of the Argentina, Santa Cruz, Argentina FW (footwall), Don Benito (La Dura), San Gregorio, El Rosario, Cantarranas (Hormiguera area), Recompensa, and La Prieta veins.

In RPA’s opinion, the sampling at Topia is being conducted in an appropriate fashion using techniques that are commonly used in the industry. The samples are properly located and oriented and are representative of the mineralization.

Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page 12-1


  www.rpacan.com

13 SAMPLE PREPARATION, ANALYSES AND SECURITY

Assaying of the channel samples is carried out in the mine laboratory, which is operated by GPR. The laboratory is equipped to perform fire and wet assays for a variety of sample types and elements. Samples were crushed and pulverized to 98% passing 200 mesh. A nominal 25 g to 30 g sub-sample was digested in aqua regia and assayed by atomic absorption spectroscopy (AA) for lead and zinc. Gold and silver were analyzed by fire assay (FA) with a gravimetric finish.

Samples for diamond drill programs up to 2006 were assayed at BSI Inspectorate of Mexico (BSI). This was subsequently changed to ALS Chemex in North Vancouver, British Columbia, and then again, in 2007, to GPR’s laboratory in Guanajuato (operated independently by SGS). Assays at the outside laboratories were conducted using Inductively Coupled Plasma (ICP) Spectrometry for base metals and FA with AA and gravimetric finish for gold and silver.

The Guanajuato (SGS operated) site has a Laboratory Information Management System (LIMS) in place which tracks the sample results and provides the means to merge the assays with the geological database (DataShed).

All phases of the sampling, transport, and assaying are carried out by authorized GPR personnel or contractors. The laboratory and core handling facility are enclosed within the mill compound, which is constantly supervised and reasonably secure. In RPA’s opinion, the sample preparation, analysis, and security procedures at Topia are adequate and consistent with common industry standards.

Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page 13-1


  www.rpacan.com

14 DATA VERIFICATION

Assay quality assurance/quality control (QA/QC) is jointly managed by SGS and GPR personnel. The mine laboratory continually monitors performance through the use of standards and calibration tests. In addition, SGS regularly conducts audits, which include reassay of a suite of pulps at the laboratory that they manage for GPR in Guanajuato (GTO). At the time of writing, GPR had retained an independent consultant to inspect the laboratory, and report on any deficiencies. RPA inspected both the Topia and GTO labs and found them to be orderly and properly equipped for the required analyses.

GPR regularly takes quarter-core duplicates from the drillholes and submits them for assay at both Topia and GTO. RPA reviewed the results of the core duplicate Ag, Au, Pb, and Zn analyses and noted the following:

  • There was a very high degree of scatter for all elements.

  • Topia laboratory has higher detection limits (DL) than GTO and for this reason there is very poor agreement between duplicate pairs at extremely low grades.

  • Gold core duplicates show a persistent negative bias for the Topia laboratory versus GTO (i.e., Topia reports lower values than GTO).

  • Silver duplicates show a positive bias for Topia versus SGS in lower grade samples, below a threshold of roughly 50 g/t Ag. The mean grades of duplicate pairs with an average grade below 50 g/t Ag was 12 g/t for Topia and 7 g/t for GTO.

  • Lead duplicates showed a very small positive bias for sample pairs above a threshold of 0.5% Pb. Below 0.5% Pb, the bias was proportionately larger, with Topia averaging 0.04% Pb and SGS averaging 0.03%, but RPA does not consider this to be significant.

  • Zinc core duplicates were unbiased above a threshold of 0.5% Zn and only modestly negatively biased for the lower grade range.

Pulps are sent monthly to GTO and compared to the Topia laboratory results. RPA reviewed these pulp duplicate assays and noted the following:

  • Scatter was much reduced relative to the core duplicates, in line with what is expected for pulp duplicates.

Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page 14-1


  www.rpacan.com
  • The results for gold show a positive bias for the Topia laboratory versus GTO. This bias persists through all grade ranges but is more pronounced in lower grade samples.

  • Globally, the pulp duplicate results for silver agreed reasonably well for both laboratories, however, there appears to be a negative bias (i.e., Topia lower than GTO) for low grade and a positive bias at higher grades.

  • The number of determinations performed at GTO for lead and zinc were too low to carry out a valid comparison.

In RPA’s opinion, the apparent assay biases are not significant enough to preclude the use of analyses from the Topia laboratory. To a large extent, the results of the duplicate assaying are conflicting and, therefore, inconclusive. RPA recommends that GPR continue to monitor the performance of the Topia laboratory to ensure that quality of the analytical results is assured.

The mine laboratory includes blanks and standards with every batch of samples. RPA reviewed the standards results for the 2010 calendar year for the Topia laboratory and notes that for the most part they were within an acceptable range.

Channel samples are plotted on 1:500 plan maps in the mine office. Sample locations and grades have been digitized into a database by mine personnel. This database was submitted to RPA for use in the Mineral Resource estimate. There was no practical way to exhaustively audit this data, however, RPA conducted a rigorous inspection of the channel sample database. This inspection comprised a review on cross section and plan views to check against the geological interpretations for erroneous coordinates or improper labelling. Also, the assay and width values were reviewed for extreme high and low values. Several errors were found, typically consisting of zero or negative width values, and samples labelled with the wrong vein name. These errors were corrected where possible, and where the errors could not be corrected, the samples were discarded.

RPA carried out a similar validation exercise on the diamond drill data. The checks also included running the GEMS validation utility for overlapping or missing intervals. No errors were found.

Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page 14-2


  www.rpacan.com

The database is compiled by GPR mine and exploration staff. A copy of this database is kept on site at Topia, as well as in GPR' s offices in Vancouver and Guanajuato.

In RPA' s opinion, the database is secure and reasonably free of severe or systematic errors. There are enough errors of minor severity, however, to warrant improvements to routine data verification protocols. RPA recommends that increased checking of the database be carried out on a regular basis, with particular rigour when preparing the Mineral Resource estimates.

Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page 14-3


  www.rpacan.com

15 ADJACENT PROPERTIES

There are several mines in the Topia district, however, the GPR mines and mill represent the principal operating entity in the camp and there are no adjacent properties of any relevance to this report.

Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page 15-1


  www.rpacan.com

16 MINERAL PROCESSING AND METALLURGICAL TESTING

Ores from the many mines in the Topia area are processed at the GPR facility located on the north side of town. Peñoles began operating the plant in 1952, and processed a total of 1.38 million tonnes, including some 64,000 tonnes of purchased ore. GPR refurbished the plant during the second half of 2005 and recommissioned it in December 2005. GPR has operated the Topia plant continuously since December 2005. The mill employs conventional crushing, grinding, and flotation to produce lead and zinc sulphide concentrates. At the time of the site visit, September 25-27, 2010, the processing plant was being operated with a capacity of 175 tpd. RPA has been informed that modifications have been completed since the visit such that the plant currently operates at 275 tpd. Ore is supplied to the plant from Property mines plus other mines in the district for custom milling. The operation runs seven days a week, 24 hours per day, with Sunday day shift reserved for maintenance. The average head grade processed by the mill from all of 2010 was 458 g/t Ag, 0.61 g/t Au, 3.0% Pb, and 3.9% Zn. The grade of lead concentrate was 8.0 kg/t Ag, 8.0 g/t Au, and 57.5% Pb, while the grade of zinc concentrate was 0.52 kg/t Ag and 52.9% Zn. Overall metal recoveries, determined from the metallurgical balance, were 92% for Ag, 80% for Au, 94% for Pb, and 92% for Zn in the two concentrates.

Coarse ore is placed in one of six bins, which provides a means for segregation of ore types for batch processing, or blending. Ore is passed through a grizzly to a 15” x 24” jaw crusher and then over a 6’ x 12’ vibratory screen. Oversize (>3/4 in) from the screen is sent to a secondary cone crusher, and then conveyed to a 200 t capacity fine ore bin.

Segregation of sulphide particles is achieved by means of a grinding circuit comprising three ball mills and two 10” dia. cyclones. Fine ore is fed to one of either a 6’ x 14’ or 5’ x 10’ ball mill. When the larger unit is in use, the product is passed through the cyclones, with the oversize fed back into the ball mill. If the smaller mill is used, the oversize from the cyclones goes to a 4’ x 8’ ball mill which operates in closed circuit with the cyclones. Final grind size is 80% passing 74 μm.

Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page 16-1


  www.rpacan.com

The ore stream passes to a lead flotation circuit comprising primary and secondary rougher and cleaner flotation cells, followed by a similarly configured zinc circuit. Concentrates are dried to 10% moisture content by means of disc filters and shipped via trucks to the port of Manzanillo for sale to a concentrate buyer. Tails are piped to an impoundment facility located downhill, approximately 750 m from the mill.

A process flow sheet is provided in Figure 16-1.

At the time of the site visit, GPR was in the process of upgrading the flotation circuits to provide additional capacity and adding an additional decant tower to improve reclamation of water from the tails.

In RPA' s opinion, the performance of the mill demonstrates that the gold, silver, lead and zinc in the ores at Topia can be recovered with conventional processes.

Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page 16-2




  www.rpacan.com

17 MINERAL RESOURCE AND MINERAL RESERVE ESTIMATES

MINERAL RESOURCES

SUMMARY

RPA has estimated the Mineral Resources for the Topia Mine, and this estimate is summarized in Table 17-1. The estimate was prepared by D. Rennie, P. Eng., Principal Geologist for RPA. Mr. Rennie is independent of GPR as per the criteria set out in NI 43-101.

The estimate was prepared using a combination of polygons and 2D block models. Accumulated metal values (grade x thickness) and vein width were estimated into the blocks using Inverse Distance Cubed (ID3) weighting. Block grades for Au, Ag, Pb, and Zn were calculated by dividing the estimated width into the interpolated accumulated metal value. The effective date of the estimate is October 31, 2010.

The Mineral Resources reside within 14 individual zones located throughout the Topia area. These zones are listed below:

 

Argentina

     
 

o

Central

     
 

o

East

     
 

o

Footwall

     
 

o

Santa Cruz

     
 

o

West

     
 

Hormiguera (Cantarranas)

     
 

Don Benito

     
 

o

La Dura North

     
 

o

La Dura South

     
 

o

La Dura West

     
 

La Prieta

     
 

Recompensa

     
 

El Rosario

Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page 17-1



  www.rpacan.com

  San Gregorio
     
  San Jorge

TABLE 17-1 TOPIA MINERAL RESOURCES - OCTOBER 31, 2010
 Great Panther Silver Limited - Topia Mine

Class Tonnage Ag Au Pb Zn
  (t) (g/t) (g/t) (%) (%)
Measured 57,700 825 1.67 7.57 4.97
Indicated 113,000 883 1.50 7.50 4.06
           
M & I 171,000 864 1.56 7.53 4.37
           
Inferred 285,000 868 1.5 6.5 3.7

Notes:

  1.

CIM definitions were followed for Mineral Resources.

  2.

The Qualified Person for this Mineral Resource estimate is David W. Rennie, P.Eng.

  3.

Mineral Resources are estimated at an NSR cut-off of US$130/t.

  4.

Mineral Resources are estimated using metal prices of US$1,200/oz Au, US$21.00/oz Ag, US$1.00/lb Pb, and US$1.10/lb Zn.

  5.

A minimum mining width of 0.30 metres was used.

  6.

Numbers may not add due to rounding.

Tables showing the Mineral Resource totals for individual zones are provided in Appendix 3.

PREVIOUS ESTIMATES

In 2006, GPR retained Wardrop Engineering Inc. (Wardrop) to complete a Mineral Resource estimate on the Animas, Dura, Madre, and Argentina veins. Total Measured and Indicated Mineral Resources were 165,000 t grading 480 g/t Ag, 0.867 g/t Au, 4.87% Pb, and 4.5% Zn (Wardrop, 2007). The estimate was carried out using Ordinary Kriging (OK) and was quoted for a minimum Gross Metal Value (GMV) of $60/t. The GMV included a 33% dilution factor and was based on metal prices and recoveries that were relevant for 2007.

Wardrop updated the estimate for the Argentina veins in 2009. The Argentina 2009 estimate totalled Measured and Indicated Mineral Resources of 117,000 t grading 651 g/t Ag, 0.71 g/t Au, 6.37% Pb, and 4.64% Zn, with Inferred Mineral Resources of 152,000 t at 690 g/t Ag, 0.97 g/t Au, 5.36% Pb, and 3.67% Zn (Wardrop, 2009). The estimate was carried out using OK, reported at a Net Smelter Return (NSR) cut-off of US$75/t. The estimate considered a provision for 33% dilution, plus typical plant

Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page 17-2


  www.rpacan.com

performance, and concentrate transport, smelting, and refining costs relevant to 2009. The Mineral Resources for the veins outside of Argentina were considered to have remained unchanged from 2007. The Mineral Resource estimate as of 2009, comprising the 2009 Argentina resources, as well as the 2007 resources outside of Argentina, is summarized in Table 17-2, and compared to the present estimate in Table 17-3.

TABLE 17-2 TOPIA MINERAL RESOURCES - 2007-2009
Great Panther Silver Limited - Topia Mine

Class  Zone Tonnage Ag Au Pb Zn
    (t) (g/t)   (g/t) (%) (%)
Measured Argentina 40,015 669 0.70 6.85 4.78
  Animas 7,032 309 2.73 3.07 4.96
  Dura 4,359 303 1.07 3.15 5.52
  Madre 2,639 307 0.78 1.55 4.02
  Other 2,205 629 0.44 8.94 4.58
  Total 56,250 577 0.98 5.92 4.82
             
Indicated Argentina 77,229 642 0.71 6.12 4.58
  Animas 13,983 267 2.45 3.12 4.83
  Dura 15,545 329 1.17 3.98 5.62
  Madre 6,435 346 1.12 2.22 5.70
  Other 3,662 673 0.41 10.81 5.38
  Total 116,854 540 0.99 5.41 4.84
             
             
Inferred Argentina 152,189 690 0.97 5.36 3.67
  Animas 5,163 179 2.45 2.95 4.80
  Dura 14,720 237 1.09 3.45 4.90
  Madre 2,115 372 1.06 2.40 6.01
  Other 0.38 620 0.48 8.03 4.48
  Total 174,187 633 1.03 5.09 3.84

Notes:

  1.

CIM definitions were followed for Mineral Resources.

  2.

The Mineral Resources for all but Argentina were quoted using a GMV of US$60/t.

  3.

Mineral Resources for Argentina were estimated at a NSR cut-off of US$75/t.

  4.

Tonnages for this table are quoted as reported, and not rounded off. Grades have been rounded to three significant figures.

Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page 17-3



  www.rpacan.com

TABLE 17-3 CHANGES TO MINERAL RESOURCES
Great Panther Silver Limited - Topia Mine

Class Tonnage Ag Au Pb Zn Contained Metal
  (t) (g/t) (g/t) (%) (%) (oz Ag) (oz Au) (lb Pb) (lb Zn)
2007-09                  
Measured 56,250 577 0.98 5.92 4.82 1,044,000 1,769 7,350,000 5,970,000
Indicated 116,854 540 0.99 5.41 4.84 2,030,000 3,730 13,900,000 12,460,000
Inferred 174,187 633 1.03 5.09 3.84 3,540,000 5,750 19,600,000 14,700,000
                   
2010                  
Measured 57,700 825 1.67 7.57 4.97 1,530,000 3,100 9,630,000 6,320,000
Indicated 113,000 883 1.50 7.50 4.06 3,210,000 5,450 18,700,000 10,100,000
Inferred 285,000 868 1.48 6.54 3.72 7,950,000 13,600 41,100,000 23,400,000
                   
Percent Difference            
Measured 2.6% 42.9% 70.7% 27.8% 3.2% 46.6% 75.2% 31.0% 5.9%
Indicated -3.3% 63.4% 50.9% 38.7% -16.0% 58.1% 46.1% 34.5% -18.9%
Inferred 63.6% 37.2% 44.2% 28.5% -3.0% 124.6% 136.5% 109.7% 59.2%

The total Mineral Resources increased in terms of both tonnage and grade from the previous year. The reason for the increase in tonnage is primarily due to the addition of Inferred Mineral Resources. The additional tonnage resulted from inclusion of new vein systems not included in past estimates and also in changes to the estimation methodology. Additions to the Mineral Resources since 2009 are partially offset by depletion due to mining. For the present estimate, the Inferred Mineral Resources were based on the area of remaining known vein extents, factored by the expected proportion of the vein that should produce resources. This is described in more detail in the section of this report entitled “Classification”.

The grades for silver, gold, and lead are observed to be up from the previous year, with zinc grades remaining roughly the same or dropping. In RPA’s opinion, the grade change can be due to a combination of factors, including the following:

  • Inclusion of several new veins to the estimate

  • New discoveries of high grade mineralization in the course of recent development work

  • Application of different top cuts

  • Several changes to the calculation and application of the NSR cut-off.

Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page 17-4


  www.rpacan.com

In RPA' s opinion, the addition of material from the new veins and development should have a significant effect on the grades. Gold grades in the La Dura and Recompensa zones are higher by an order of magnitude than the other vein systems. Silver grades in Hormiguera, San Gregorio, and El Rosario are comparatively high, as well. Recent development in the Argentina veins resulted in the discovery of high grade mineralization which has also had a significant impact on the global resource grades.

Zinc grade does not appear to have changed very much, which is in contrast to the trend for the other metals. RPA notes that samples for many of the veins do not have zinc assays, and in those circumstances zero grade was applied. This would have caused an understatement of zinc grades overall and a reduction in grade, rather than the increase seen for silver, gold and lead. In RPA' s opinion, the zinc grade for the entire estimate is conservatively biased by this lack of assay data.

Top cuts used in 2007 and 2009 were 2,000 g/t Ag, 6.0 g/t Au, 20% Pb, and 20% Zn. For the present estimate, Pb and Zn were not capped, and Ag and Au were capped at a range of levels depending on the zone. The top cut for Ag ranged from a low of 600 g/t Ag to a high of 5,000 g/t Ag; and for Au ranged from 0.75 g/t Au to 30 g/t Au. The actual impact of this is difficult to predict as it depends on the cumulative effect that the caps had on local areas. For most of the zones, the top cuts for Au and Ag were lower than those applied in 2007 and 2009. However, for Argentina, which comprises the single largest subset of the data, the caps for Ag in the present estimate were significantly higher. Consequently, it is likely that this resulted in an overall increase in estimated Ag grades, as well as an increase in the tonnage reporting above cut-off.

The NSR calculation has been updated with recent costs, recoveries and metal prices, as well as an increase in the estimated dilution allowance. The NSR cut-off applied for this estimate was $130/t, which is higher than both the 2007 ($37.50/t) and 2009 ($75/t) estimates. This will have the overall effect of reducing the tonnage reporting above cutoff and increasing the global resource grades. Operating costs have increased since the previous estimates, and this will result in an overall increase in the cut-off, which will also reduce the tonnage and increase grades. Metallurgical recoveries have improved, which should allow lower grade material to make the cut-off, with corresponding increase in tonnage and reduction of global resource grades.

Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page 17-5


  www.rpacan.com

Metal prices used for the 2009 estimate were US$890/oz Au, US$12.50/oz Ag, US$0.625/lb Pb, and US$0.625/lb Zn. For the present estimate, the metal prices were US$1,200/oz Au, US$21.00/oz Ag, US$1.00/lb Pb, and US$1.10/lb Zn. This represents increases of 35% for Au, 68% for Ag, 60% for Pb, and 76% for Zn. The increased metal prices will tend to reduce overall resource grades and increase tonnage.

For the NSR calculation in the 2009 estimate, a provision was made for 33% dilution at zero grade. This dilution factor has been increased to 50% for the present estimate. In addition, a minimum width constraint of 30 cm has been applied. RPA estimates that the application of the minimum width constraint resulted in an additional 10% dilution, also at zero grade. In RPA' s opinion, this will reduce the amount of material reporting above cut-off, and could also result in an increase in the global resource grades.

In RPA' s opinion, the various changes in the NSR parameters have opposing effects that will tend to cancel one another out. The principal reasons for the changes to the Mineral Resource estimate are the addition of new resources through exploration and development, the revisions to the capping, and the modification of the classification methodology.

DATABASE

The data were provided to RPA as a series of ASCII files, which were then loaded into a GEMS Project File. These data included a series of wireframe models in DXF format, which were also loaded into GEMS. The wireframe models represented the interpreted veins, with areas excised in " cookie-cutter" fashion to account for the underground development and stoping.

The samples comprised drill core and underground chips. The database contained records for 213 drillholes encompassing 2,643 sampled intervals. Of those intervals, 204 were taken from the mineralized zones included in the estimate. There were 6,816 chip samples in total, of which 4,478 were used in the estimate.

RPA tagged the samples with integer codes depending on the zone in which they were located. These codes provided a basis for sub-setting the data during the grade interpolations so that the block grades for each individual zone were estimated using only samples from that zone. The zone codes are listed in Table 17-4.

Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page 17-6


  www.rpacan.com

For the most part, the veins were narrow enough such that only a single sample was sufficient to cover the entire zone. For some drill intercepts, however, there were multiple samples in the vein, which required compositing. These samples were composited across the vein width, and then all intercepts, whether they were composites or not, were adjusted for true width. This adjustment was made using the GEMS utility that can estimate the true thickness from the vein and drillhole orientations. The chip samples were assumed to have been taken horizontally across the strike of the zones, so no adjustment for true width was deemed necessary.

TABLE 17-4 ZONE CODES
Great Panther Silver Limited - Topia Mine

Area Code Zone - RPA
Hormiguera 101 San Miguel
  102 San Jorge
     
Argentina 203 Arg - FW
  205 Arg - West
  201 Arg - Central
  202 Arg - East
  204 Santa Cruz
     
Don Benito 301 DB North
(La Dura) 302 DB South
  303 DB West
     
El Rosario 401 El Rosario
     
San Gregorio 501 San Gregorio
     
La Prieta 601 La Prieta
     
Recompensa 702 Recompensa

SAMPLE STATISTICS

RPA conducted statistical analyses of the chip sample data. Summaries of the sample statistics are provided in Appendix 2. The diamond drill samples were not numerous enough to be statistically significant and so no analysis was done for these data.

Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page 17-7


  www.rpacan.com

RPA notes that the grade distributions for all populations are weakly to moderately skewed, and that top cuts are recommended to ensure that the estimated block grades are not overly biased.

TOP CUTS

Positively skewed data will often yield block models that overestimate grade owing to the inordinately large influence that the highest grade samples exert on the global average. A commonly used method of dealing with this problem is to apply a cap or top cut to the sample grades.

In order to estimate the capping levels for each vein, RPA used Cutting Curves. The samples were subject to a range of top cuts, and the mean grades were calculated for each cut. The caps were plotted against the cut mean grade to produce a curve similar to the example in Figure 17-1. For a typical case, the resulting curve tends to be flatter near the upper cap ranges, curving downwards towards the y-axis as the cap is lowered. In RPA' s experience, a reasonable range for the top cut generally occurs on the flatter portion of the curve just before it drops off at the lower range of cap values. In the case of Figure 17-1, that range would be between 3,000 g/t Ag and 5,000 g/t Ag. The value selected in this example was 4,000 g/t Ag.

The top cuts derived by the various methods for the Topia data are summarized in Table 17-5.

The top cuts were applied to the sample grades for Au and Ag only. Capping was performed on the drill samples prior to compositing.

Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page 17-8


  www.rpacan.com

FIGURE 17-1 CUTTING CURVE FOR SILVER – SAN MIGUEL VEIN

Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page 17-9


  www.rpacan.com

TABLE 17-5 CAPPING LEVELS
Great Panther Silver Limited - Topia Mine

Zone       Au             Ag      
  Uncapped  Top Cut   No.  No. Pctile  Capped  % Change Uncapped Top Cut    No.   No. Pctile  Capped    % Change
  (g/t Au) (g/t Au)   Cut   (g/t Au)   (g/t Ag) (g/t Ag)   Cut   (g/t Ag)  
                             
Hormiguera - San Miguel 0.808 1.800 324 28 0.914 0.715 -11.5% 1,639.6 4,000.0 324 47 0.855 1,381.4 -15.7%
La Dura 0.903 2.000 164 21 0.872 0.760 -15.8% 243.9 750.0 164 10 0.939 198.0 -18.8%
La Dura - North 2.556 7.500 611 17 0.972 2.098 -17.9% 495.3 1,000.0 611 70 0.885 411.4 -16.9%
La Dura - South 2.592 4.000 216 42 0.806 2.173 -16.2% 600.5 1,250.0 216 21 0.903 525.5 -12.5%
La Dura - West 4.548 8.000 194 31 0.840 4.060 -10.7% 240.0 600.0 194 23 0.881 214.1 -10.8%
La Prieta 4.695 7.000 9 2 0.778 3.374 -28.1% 393.9 1,000.0 9 2 0.778 294.2 -25.3%
Rosario 0.207 0.750 263 12 0.954 0.178 -14.1% 859.8 2,000.0 263 31 0.882 782.0 -9.0%
San Gregorio 0.381 1.000 281 18 0.936 0.333 -12.6% 1,436.3 2,500.0 281 49 0.826 1,292.7 -10.0%
Hormiguera - San Jorge 0.749 1.500 152 12 0.921 0.669 -10.7% 1,223.3 2,500.0 152 17 0.888 1,061.6 -13.2%
Recompensa 14.588 30.000 452 33 0.927 13.437 -7.9% 283.5 1,000.0 452 20 0.956 254.3 -10.3%
                             
Argentina (All) 0.568 2.000 1977 89 0.955 0.501 -11.8% 963.9 5,000.0 1978 58 0.971 857.0 -11.1%
Argentina - Central 0.501 2.000 193 8 0.959 0.439 -12.4% 835.5 2,500.0 193 11 0.943 680.8 -18.5%
Argentina - East 0.655 2.000 762 41 0.946 0.591 -9.8% 658.7 2,500.0 762 37 0.951 598.0 -9.2%
Argentina - FW 0.778 1.250 74 8 0.892 0.578 -25.7% 2,089.6 4,000.0 74 10 0.865 1,811.9 -13.3%
Argentina - Santa Cruz 0.555 2.000 368 20 0.946 0.460 -17.1% 774.2 3,500.0 368 19 0.948 656.1 -15.3%
Argentina - West 0.458 1.750 579 20 0.965 0.402 -12.2% 1,385.9 5,000.0 580 35 0.940 1,116.1 -19.5%

Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page 17-10



  www.rpacan.com

COMPOSITING

As previously stated, where there were two or more consecutive drill samples comprising a vein intercept, the samples were composited across the zone. This tended to be a fairly rare occurrence. Once composited and adjusted for true width, the intercepts were combined with the chip samples for use in the grade interpolations. The resulting dataset, including channel samples and composited drill intercepts, comprised 4,650 samples.

GEOSTATISTICS

RPA carried out a geostatistical analysis to develop criteria for selection of estimation parameters and resource classification. The analysis was carried out using both GEMS and Sage software. Early variography generated from the original 3D data was not very definitive, partially because of the flexures in the veins. In order to try to work around this, the data points were coded according to vein system and given transformed coordinates to simulate purely planar vein structures. Each individual vein was segregated from adjacent veins to ensure that the variogram software did not match pairs of samples from different structures. Correlograms were run in Sage for the accumulated metal values (i.e., grade x width) as well as for vein true width. The results were checked using GEMS.

Note that throughout this report correlogram, semi-variogram, and variogram are used interchangeably.

The results of the variogram analysis were used to create 2D models with a major and semi-major direction in the plane of the vein, but which ignored the minor axis direction. These models are shown in Table 17-6. The variograms for these models are provided in Appendix 4.

The variography showed that for all components, the best and most easily interpretable results tended to be along the on-strike direction, generally within about 15° of horizontal. This resulted in the models all having the major axis in the on-strike direction, with the semi-major axis in the vertical direction. RPA notes that for all the variogram models, the range in the vertical direction was significantly shorter than that for the horizontal.

Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page 17-11


  www.rpacan.com

TABLE 17-6 2D VARIOGRAM MODELS
Great Panther Silver Limited - Topia Mine

Component    Direction Nugget C1 R1 C2 R2 % Nug.
Ag X L Horizontal 0.528 0.166 54.3 0.306 190.4 52.8%
  Vertical     41.0   81.4  
               
Au X L Horizontal 0.311 0.060 40.6 0.628 516.9 31.1%
  Vertical     74.5   108.6  
               
Pb X L Horizontal 0.336 0.283 6.2 0.231 53.0 39.5%
  Vertical     8.4   17.0  
               
Zn X L Horizontal 0.406 0.288 7.7 0.306 246.9 40.6%
  Vertical     7.0   71.0  
               
Width Horizontal 0.192 0.428 8.8 0.115 39.8 26.1%
  Vertical     3.3   9.5  

Most components, with the exception of AuXL, yielded coherent models with well-defined sills. The AuXL variogram did not reach a sill within a reasonable distance for the horizontal direction. Similarly, for the vertical direction, the number of pairs dropped below the minimum allowable threshold (350) at about 90 m, before the sill was reached.

Ultimate ranges in the along-strike direction varied from a high of 247 m for ZnXL to a low of 40 m for Width. The longest ranges were obtained for ZnXL and AgXL (190 m), while the range for PbXL was only 53 m. In RPA’s opinion, this is somewhat unexpected, as precious metal values are typically more variable than base metals. However, it may be due to the fact that the precious metals were capped, which would reduce the overall variance of the data.

The ranges in the vertical direction were much shorter for all components compared to the horizontal direction. This is somewhat unexpected as there are no known geological or mineralogical reasons for the grade anisotropy to be oriented in a horizontal direction. In RPA’s opinion, this may be due more to the distribution of the samples than to any underlying property of the deposit.

Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page 17-12


  www.rpacan.com

Nugget effects for all components tended to be relatively high, typically greater than 30% of the total sill and often 40% or more. The implication for this is that the close-range variability of the data is fairly high, which will negatively impact on the accuracy of local block grade interpolations. It also precludes using the variograms to define distance parameters for Measured Resources. A commonly used rule of thumb for definition of Measured Resources is to assign this category to blocks with samples within the range of the variogram at the point at which 1/3 of the total sill is achieved. In this case, most of the variogram models have reached 1/3 of the sill at zero distance.

The other principal conclusion drawn from the variography is the definition of the maximum search range to use for the grade interpolations. For estimation of multiple components in a block model, RPA recommends that the search parameters be consistent throughout so that every block receives an estimate for all components. This typically means that the search distances must be derived from the component with the shortest ranges. If this is done, all blocks in the model will receive an estimate for all components, and the quality of all estimates should be as good as or better than that of the least continuous element. RPA set the maximum search for the grade interpolations to 50 m, which is slightly greater than the maximum range for Width and roughly equal to the range of the major axis for the next most continuous component, which is PbXL.

BLOCK MODELS

The block models comprised vertical 2D arrays of blocks measuring 2.5 m x 2.5 m in size, oriented roughly parallel to the strike of the veins. Values for accumulated metal for Ag, Au, Pb, and Zn, as well as true width were estimated into each block. The block grades were calculated by dividing the estimated accumulated metal “grade” by the estimated true width. Volumes were derived from the area of each block multiplied by the estimated width, and tonnages were calculated from the product of the volume and the estimated bulk density.

Resource “panels” were manually drawn on the longitudinal projections based on the sample grades, resource class, and the interpolated block grades. The panels were configured to encompass contiguous sections of material with NSR values of US$130/t or greater. Panel grades were estimated by averaging the blocks within the panel outlines.

Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page 17-13


  www.rpacan.com

BULK DENSITY

GPR personnel continually take density measurements of core specimens, using a water immersion method. The density is derived from the ratio of the weight of the sample in air and the difference between the weights in air and submerged in water. RPA was provided with the results from 308 determinations and segregated the measurements by vein in order to derive average densities for each zone. There are highly variable density values for each of the zones owing the sulphide contents and presence or absence of barite. The average densities derived for each vein system are shown in Table 17-7.

TABLE 17-7 BULK DENSITY
Great Panther Silver Limited - Topia Mine

Area Average
  (t/m3)
Argentina 2.77
Don Benito 3.03
Durangueño 3.20
El Rosario 2.99
Hormiguera 2.49
La Prieta 2.85
Recompensa 3.06
San Gregorio 2.81
   
All 2.94

GRADE INTERPOLATIONS

The interpolations were carried out in two passes, using ID3 weighting. For the first pass, the search was configured to use a circular 50 m ellipsoid, with a minimum of one and maximum of six samples per estimate. In the second pass, the search was reduced to a 30 m radius and the minimum number of samples was increased to two. The second pass was allowed to overwrite blocks estimated in the first pass.

As previously stated, the interpolations were run for accumulated metal values and true width, and the block grades were derived by dividing the metal value by width.

BLOCK MODEL VALIDATION

The block grades were validated using the following methods:

Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page 17-14

 



  www.rpacan.com
  • Visual inspection of the block grades and comparison with data values.

  • Comparison of global block and sample means.

The block grades were observed to honour the sample grades reasonably well. There were several instances where the interpolations extended out along strike beyond the sampled interval of the drifting. These areas were deliberately excluded from the resource estimate. It was also apparent that in some areas grade smoothing has occurred, particularly in places with widely varying sample grades. An attempt was made to manually exclude areas from the resource panels where grades appeared to have been smeared out into relatively poorly informed zones.

The search parameters were deliberately configured to try to reduce smoothing. However, this appears to have had the effect of forcing a vertical “striping” to the grade distributions. The striping reflects the spatial distribution of the sampling, which is generally in a series of horizontal strings along the drifts. In RPA’s opinion, the interpolated grades may be locally inaccurate on a block by block basis, but at the panel level of support, the grades should be reasonably accurate.

An example longitudinal projection, showing block NSR grades and resource panel outlines is provided in Figure 17-2. Some of the vertical “striping” in the grades is evident in this diagram.

The sample and block grades for the 30 m Pass 1 estimation runs are presented in Table 17-8. RPA notes that there are many instances where there was a difference greater than ±15%, most notably for zinc. The instances of significant negative differences (i.e., average block grades less than the sample grades), are more numerous than the positive differences.

Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page 17-15

  www.rpacan.com

TABLE 17-8 COMPARISON OF SAMPLE AND BLOCK GRADES
Great Panther Silver Limited - Topia Mine

    Ag     Au     Pb     Zn     Width  
  Samp  Blk  Diff Samp  Blk  Diff Samp Blk Diff Samp Blk Diff Samp Blk Diff
Zone (g/t) (g/t) (%) (g/t) (g/t) (%) (%) (%) (%) (%) (%) (%) (m) (m) (%)
Arg Cen 440 528 20.1% 0.30 0.41 38.3% 3.77 5.31 40.8% 0.72 0.41 -42.2% 0.67 0.66 -0.2%
Arg East 449 312 -30.6% 0.44 0.32 -28.6% 6.57 3.77 -42.7% 0.05 0.01 -77.7% 0.77 0.70 -9.1%
Arg FW 1,207 895 -25.8% 0.39 0.32 -18.3% 11.12 8.50 -23.5% 2.03 2.45 20.7% 0.70 0.67 -3.3%
Arg SC 276 233 -15.5% 0.20 0.18 -9.8% 2.20 1.92 -12.4% 0.00 0.00 n/a 0.49 0.48 -1.6%
Arg West 506 439 -13.2% 0.18 0.19 2.8% 3.65 3.09 -15.3% 0.91 1.04 15.2% 0.49 0.48 -2.3%
Horm 318 281 -11.5% 0.15 0.15 1.3% 0.56 0.57 2.7% 1.08 0.84 -22.8% 0.32 0.32 0.2%
LD North 194 151 -21.9% 0.84 0.71 -15.9% 3.86 3.10 -19.7% 3.83 3.40 -11.2% 0.47 0.42 -11.5%
LD South 150 139 -7.1% 0.58 0.55 -5.9% 3.15 2.54 -19.3% 0.28 0.63 125.4% 0.35 0.35 0.3%
LD West 87 123 41.0% 1.66 2.24 35.2% 1.28 1.36 6.7% 1.98 2.62 32.4% 0.45 0.52 15.4%
Recompensa 78 48 -38.4% 3.71 2.82 -24.0% 1.60 0.93 -41.5% 1.95 1.23 -37.0% 0.37 0.35 -3.3%
Rosario 374 333 -10.9% 0.08 0.08 0.3% 2.16 1.92 -11.0% 2.74 2.09 -23.7% 0.49 0.48 -2.3%
San Gregorio 485 414 -14.7% 0.15 0.14 -8.5% 2.42 1.97 -18.7% 5.68 4.55 -19.9% 0.52 0.52 0.9%
San Jorge 173 280 61.6% 0.11 0.18 56.1% 0.46 0.58 27.1% 1.15 1.17 1.7% 0.33 0.42 29.8%

Notes:

1.

This comparison is for Pass 2, 30 m radius interpolations only.

2.

Average sample grades are for those samples captured in the interpolation and may not equal the global sample means.

3.

Block grades are only for those included in the Pass 2 interpolation and may or may not have been included in the Mineral Resources. Consequently, the average block grades will not necessarily agree with average resource grades.

4.

Numbers may be rounded.

   
Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page 17-16



  www.rpacan.com

RPA notes that there were three cases with significant positive biases for both gold and silver, namely, Argentina Central, La Dura West, and San Jorge (Table 17-8). In RPA’s opinion, these positively biased zones will likely be more than compensated for by the negative biases and there will likely be an overall conservative bias to the estimate. Two of the zones with positive biases have coincident positive differences for vein width, as well. In RPA’s opinion, this will also partially offset the apparent bias in the accumulated metal values, as the calculated grades for these components will be less biased than the accumulated metal values.

As a further check, RPA inspected the block grade distributions to see if there were any discernable reasons for the apparent biases. For Argentina Central and San Jorge, there were a couple of very high grade drillhole intercepts, which appeared to fill a relatively large number of blocks with uniformly high grades. These blocks had been excluded from the Mineral Resources, and will not have contributed to any bias to the estimate.

RPA could find no obvious reason for the apparent bias at La Dura West. The estimated block grades appear to agree well with the samples.

In RPA’s opinion, the block interpolations may be locally biased, but are unbiased on the panel and global levels. Apparent biases in the block grades relative to the samples appear to be due to drillhole intercepts that were allowed to disproportionately influence large numbers of blocks. These areas were not included in the Mineral Resource panels, so the bias will not be reflected in the estimate.

RESOURCE CUT-OFF

The Mineral Resources are quoted using an NSR cut-off of US$130/t. The NSR value was derived using metal prices of US$1,200/oz Au, US$21.00/oz Ag, US$1.00/lb Pb, and US$1.10/lb Zn. Provision was also made for 50% dilution, current (2010) metallurgical recoveries and concentrate grades, and offsite costs including all concentrate transport and port handling costs and smelting and refining terms applicable for 2010. NSR values were calculated from the block grades using the following factors:

  • Au: US$12.903 / g/t Au

  • Ag: US$0.2852 / g/t Ag

Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page 17-17


  www.rpacan.com
  • Pb: US$7.175 / % Pb

  • Zn: US$6.375 / % Zn

The NSR cut-off was estimated into the samples and the blocks and served as the primary guide for drawing the resource panels. Resource panels were drawn around zones of above-cut-off blocks, occasionally including lower grade material where necessary for continuity.

CLASSIFICATION

The blocks were classified in accordance with Canadian Institute of Mining, Metallurgy and Petroleum Definition Standards for Mineral Resources and Mineral Reserves (CIM definitions). The block class assignment was carried out in two steps. Initially, a provisional assignment was made using the following criteria:

  • All blocks estimated by three samples or more, with an average distance to samples of 10 m or less, were assigned Category One to designate them as eligible for the Measured classification.

  • Blocks estimated by three samples or more, with an average distance of 10 m to 30 m from samples, were assigned Category Two to designate them as eligible for the Indicated classification.

  • The rest of the known extent of the veins located above the interpreted base of the epithermal system and below a 10 m crown pillar were assigned to Category Three, to designate these areas as eligible for the Inferred classification. Blocks within 30 m above or below development headings with low grades, or no sampling at all, were disqualified from classification as Mineral Resources.

Resource panels were defined on longitudinal projections, an example of which is provided in Figure 17-2. The panels encompassed clusters of Category One and Two blocks that were equal to or above the $130/t cut-off. Panel boundaries were generally extended vertically up and down from drifts (horizontally from raises) except where it was possible to connect to panels on adjacent headings. Occasionally, Category Two panels were adjusted to honour drill results by extending or reducing the projection distance where warranted (Figure 17-2). Narrow resource panels were not extended up or down-dip beyond a distance equal to the strike-length of the zone. Pillars were excluded from the Mineral Resources.

Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page 17-18


  www.rpacan.com

Category One panels were assigned the Measured classification, and Category Two were classed as Indicated.

For the Inferred class, the areas of the known veins previously nominated as Category Three were summed and a factor applied to account for the proportion of the vein expected to yield Mineral Resources. These factors were derived from the aggregate proportion of ore or Mineral Resources exposed in development drifting versus the total amount of drifting, up to a maximum of 75%. Grades for the Inferred Mineral Resources were derived from the mean grades of the combined Measured and Indicated Mineral Resources for the given vein.

Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page 17-19




  www.rpacan.com

MINERAL RESERVES

There have been no estimates of Mineral Reserves for the Topia property.

Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page 17-21


  www.rpacan.com

18 OTHER RELEVANT DATA AND INFORMATION

Mining has been ongoing at Topia since the early 16th century, and possibly longer. GPR has been operating the Topia mill since December 2005. GPR is conducting underground mining and development on a continuous basis and is providing feed for the mill at an average rate of 130 tpd. Additional sources of mill feed from third party producers in the camp allow the mill to operate at a rate of 175 tpd.

For the narrower veins at Topia, mining is by conventional cut and fill stoping with resuing to selectively mine the ore and leave the waste for backfill. Drilling is done with jackleg drills and ore is hand mucked in the stope and dropped down timber crib muck passes which are carried upwards as the stoping advances. Ore is hand sorted at the face so that only the higher grade ore is removed from the stope. Man access and ventilation is provided in timber crib manways adjacent to the muck passes. The level interval for the stopes is typically 40 m.

The use of ground support in the small tunnels and narrow stopes is infrequent as the small headings require little support.

From the muck passes the ore is pulled via manual chutes, loaded into small rail cars, and hand trammed to a dump at the portal. At the surface ore dump, the ore may again be hand sorted to remove waste material. Waste from the hand sorting or from excess development is generally dumped over the bank at these smaller mines. Ore is then picked up by front-end loader and loaded into highway-style 10 t- to 20 t-capacity dump trucks to be hauled to the mill.

In the Argentina mine, there are significant areas with vein widths in excess of one metre. In these wider areas, the mine is planned on the basis of mechanized cut and fill mining with small 2.0 yd3 LHDs for development and 1.0 yd3 and 0.5 yd3 LHDs for mucking in the stopes. Development access is via decline. Ground support consists of rock bolts and mesh as required. Rocks include a combination of cement-grouted rebar and split set which gives initial support from the split set bolt and then longer term support from the cement grouted portion of the bolt.

Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page 18-1


  www.rpacan.com

Sublevels are 40 m apart in the mechanized cut and fill. Waste is generated from material beside the vein, which is blasted separately from the ore and then left as fill, or from the waste development in the mine.

Lifts in the cut and fill stope are taken with horizontal holes (breasting), as the use of uppers drilling (to increase productivity and production) generated a ragged back in the stope and led to problems with ground support.

Ore is hauled from the stope by LHDs and then loaded into a truck for haulage to the mill.

At the time of the site visit, ore from development and stoping was being produced at the following Property mines: Argentina (Argentina West vein), Hormiguera (Cantarranas and San Jorge veins), Descubridora (Cantarranas vein), San Miguel, Recompensa and El Rincon (Recompensa veins), 1522 (Don Benito and Madre veins), Crucero 9 Norte (Don Benito), Animas (Animas vein), San Gregorio and Durangueno (San Gregorio vein), El Rosario (El Rosario vein), Oliva (Oliva vein), and El Ochenta (Madre). Additional veins with ore grade material exposed or which represent near-term exploration and development targets include La Prieta and Las Higueras.

Milling, as described in Section 16 of this report, is by conventional crushing, grinding, and froth flotation. Tails are impounded behind a dam located 750 m south of the mill.

In RPA' s opinion, the successful mining and milling operations at Topia demonstrate that the mineralized vein material qualifies as Mineral Resources. There is significant potential for discovery of additional Mineral Resources through exploration and development along existing vein systems. In addition, there is potential for discovery of other veins in the district, as there are drill intercepts, with significant grades, that have been obtained, which have not been correlated with known structures.

Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page 18-2


  www.rpacan.com

19 INTERPRETATION AND CONCLUSIONS

RPA has carried out an estimate of the Mineral Resources for the Topia property. The estimate is summarized in Table 19-1.

TABLE 19-1 TOPIA MINERAL RESOURCES - OCTOBER 31, 2010
Great Panther Silver Limited - Topia Mine

Class Tonnage Ag Au Pb Zn
  (t) (g/t) (g/t) (%) (%)
           
Measured 57,700 825 1.67 7.57 4.97
Indicated 113,000 883 1.50 7.50 4.06
           
M & I 171,000 864 1.56 7.53 4.37
           
Inferred 285,000 868 1.5 6.5 3.7
 

Notes:

 
  1.

CIM definitions were followed for Mineral Resources.

  2.

The Qualified Person for this Mineral Resource estimate is David W. Rennie, P.Eng.

  3.

Mineral Resources are estimated at an NSR cut-off of US$130/t.

  4.

Mineral Resources are estimated using metal prices of US$1,200/oz Au, US$21.00/oz Ag, US$1.00/lb Pb, and US$1.10/lb Zn.

  5.

A minimum mining width of 0.30 metres was used.

  6.

Numbers may not add due to rounding.

RPA concludes that:

  • The sampling conducted by GPR is appropriate for the deposit type and mineralization style. Reasonable and practical steps are taken to ensure security of the samples. RPA notes, however, that some channel sample widths are unreasonably low and that a practical minimum sampling width should be maintained.

  • Diamond drilling, logging, and core handling are being carried out in a reasonable fashion, consistent with industry best practice.

  • Assaying is being conducted using conventional methods, in facilities that are properly configured and managed. Performance of the laboratory is being monitored by both internal QA/QC protocols and comparison with an external laboratory.

  • Some of the duplicate results indicate that there may be biases for analyses in the lower grade ranges for gold and silver. However, the evidence is somewhat ambiguous as it is not consistent between core and pulp duplicates. Continued monitoring of the laboratory, in accordance with current industry best practice guidelines, should be maintained.

Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page 19-1


  www.rpacan.com
  • The sample database is observed to contain several errors of low severity. Improved validation is required for the data capture process.

  • Appropriate safeguards are in place to ensure that the database is reasonably secure.

  • The grade estimate for zinc is conservatively biased owing to a lack of assay data in many areas.

  • There is potential for discovery of additional Mineral Resources at Topia through exploration and development.

Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page 19-2


  www.rpacan.com

20 RECOMMENDATIONS

RPA makes the following recommendations:

  • GPR should continue mining operations at Topia.

  • Exploration should continue in order to continue to add to the resource base.

  • Assay QA/QC protocols should be maintained to ensure that the results produced by the Topia laboratory are accurate and unbiased. This should include regular and prompt review of QA/QC results. RPA notes that an independent review of the laboratory has been initiated and considers this to be good practice. RPA recommends that some level of independent monitoring be maintained.

  • The data capture for the channel sampling should be standardized and validation protocols should be enhanced to reduce the number of errors in the database.

  • A reasonable minimum sample width for the channels should be established and maintained.

RPA notes that GPR plans to continue surface drilling on a number of the vein systems at Topia. A total of 7,210 m in 55 holes are planned for the immediate Topia area, as well as 350 m of drilling in five holes at La Cuñita, which is a prospect located 15 km from Topia. A budget for this drilling is provided in Table 20-1. In RPA’s opinion, this work is warranted, and RPA recommends that it be carried out.

Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page 20-1


  www.rpacan.com

TABLE 20-1 EXPLORATION BUDGET
Great Panther Silver Limited - Topia Mine

Budget Item     Amount (US$)
       
Drilling Topia 7,210 m @ $100/m 721,000
  La Cuñita 350 m @ $100/m 35,000
       
Geology   $25,000/mo @ 5 months 125,000
       
Assays   700 @ $15 ea 10,500
       
Supervision     10,000
       
Subtotal     901,500
Contingency (15%)     135,225
Total     1,036,725
       
Say     1,000,000

Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page 20-2



  www.rpacan.com

21 REFERENCES

Orequest, 2003, Summary Report on the Topia Project, Municipality of Topia, Durango State, Mexico, for Great Panther Resources Limited (November 2003).

Quality Analysis Consultants, 2011, Letter report to Great Panther Silver Limited (February, 2010).

Wardrop Engineering., 2007, Technical Report on the Topia Mine Property, prepared for Great Panther Resources (February 2007).

Wardrop Engineering., 2009a, Topia Mine Project Resource Estimate for the Argentina Veins, prepared for Great Panther Resources (October 14, 2009).

Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page 21-1


  www.rpacan.com

22 DATE AND SIGNATURE PAGE

This report titled “Technical Report on the Topia Mine, State of Durango, Mexico” and dated March 28, 2011, was prepared and signed by the following author:

  (Signed & Sealed) “David W. Rennie
   
   
Dated at Vancouver, BC  
March 28, 2011 David W. Rennie, P.Eng.
  Principal Geologist

Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page 22-1



  www.rpacan.com

23 CERTIFICATE OF QUALIFIED PERSON

DAVID W. RENNIE

I, David W. Rennie, P.Eng., as an author of this report entitled “Technical Report on the Topia Mine, State of Durango, Mexico” prepared for Great Panther Silver Limited and dated March 28, 2011, do hereby certify that:

1.

I am a Principal Geologist with Roscoe Postle Associates Inc. of 1130 West Pender Street, Suite 388, Vancouver, British Columbia V6E 4A4 Canada.

     
2.

I am a graduate of University of British Columbia, Vancouver, BC, Canada, in 1979 with a Bachelor of Applied Science degree in Geological Engineering.

     
3.

I am registered as a Professional Engineer in the Province of British Columbia (Reg.# 13572). I have worked as a Geological Engineer for a total of 32 years since my graduation. My relevant experience for the purpose of the Technical Report is:

     

Review and report as a consultant on numerous mining operations and projects around the world for due diligence and regulatory requirements.

Pre-Feasibility and Feasibility Study work on several projects.

Worked as a Geological Engineer at several mines and exploration projects in a number of countries.

     
4.

I have read the definition of "qualified person" set out in National Instrument 43- 101 (NI 43-101) and certify that by reason of my education, affiliation with a professional association (as defined in NI 43- 101) and past relevant work experience, I fulfill the requirements to be a "qualified person" for the purposes of NI 43-101.

     
5.

I visited the Topia Mine on September 23-25, 2010.

     
6.

I am responsible for overall preparation of all parts of the Technical Report.

     
7.

I am independent of the Issuer applying the test set out in Section 1.4 of NI 43- 101.

     
8.

I have had no prior involvement with the property that is the subject of the Technical Report.

     
9.

I have read NI 43-101, and the Technical Report has been prepared in compliance with NI 43-101 and Form 43- 101F1.

     
10.

To the best of my knowledge, information, and belief, the Technical Report contains all scientific and technical information that is required to be disclosed to make the technical report not misleading.

Dated this 28th day of March, 2011.

(Signed & Sealed) “David W. Rennie

David W. Rennie, P.Eng.

Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page 23-1


  www.rpacan.com

24 APPENDIX 1

LIST OF MINERAL TENURES

Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page 24-1


  www.rpacan.com

TABLE A24-1 LIST OF TOPIA MINERAL TENURES
Great Panther Silver Limited - Topia Mine

Concession name Title # Hectares
AMPL. DE LA MARQUESA 181018 31
AMPL. DE LAS ANIMAS 181013 5
AMPL. DE OLIVIA 180784 23
AMPL. DEL CARMEN 180793 16
ANIMAS 181167 8
ARCOIRIS 214597 100
ARGENTINA NORTE 181017 14
AUSTRALIA 180789 50
C.E. SCHAUFFLER PONIENTE 181164 6
CANTARANAS 181020 19
DON EDUARDO 180788 29
DON ENRIQUE 180799 45
DON RAFAEL 180785 94
EL CANGURO 180782 64
EL CARMEN 181166 9
EL CONDOR 125934 64
EL DURANGUENO 180790 50
EL VASCO 181015 37
JULIAN RIVERA 181165 8
LA ARGENTINA 181169 20
LA COLORADO 181014 4
LA CONCHA Y ANEXAS 180781 14
LA DURA Y ANEXAS 180794 24
LA ESPERANZA 177243 183
LA JICARA 181016 52
NUEVA ARGENTINA Y CARRIZO 180792 30
OCCIDENTAL ESTE 180795 10
PROSPERIDAD 181162 22
SALTAN RANAS 180796 14
SAN ANDRES 180791 10
SANTA BIBIANA 181163 5
SANTO NINO 185869 8
SOCAVON VICTORIAS 181019 8
TOPIA UNO 176292 221
UNIF. AMPL. DEL SALTO 184675 3
UNION DEL PUEBLO 181012 6
VALENCIANA Y OLIVA 181168 11
ZONA BUENA 180797 3
Topia II 222533 4826.27
TOPIA II - F1 222534 0.66

Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page 24-2



  www.rpacan.com

Concession name Title # Hectares
TOPIA II - F2 222535 2
TOPIA II - F3 222536 0.09
TOPIA II - F4 222537 6.52
TOPIA II - F5 222538 0.01
TOPIA II - F6 222539 0.04
TOPIA II - F7 222540 3.78
TOPIA II - F8 222541 2.41
TOPIA II - F9 222542 0.27
TOPIA II - F10 222543 0.17
TOPIA II - F11 222544 0.97
TOPIA II - F12 222545 0.47
TOPIA II - F13 222546 0.46
LA PRIETA 154137 94.09
Total   6,258

Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page 24-3



  www.rpacan.com

25 APPENDIX 2

SAMPLE STATISTICS

Tables of statistics for the sample data.

Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page 25-1


  www.rpacan.com

TABLE A25-1 CHIP SAMPLE STATISTICS - SILVER
Great Panther Silver Limited - Topia Mine

Ag              
Zone Number  Mean Median      SD CV Max  Min
Arg Cen 193 835.50 437.00 1,653.47 1.98 20,240.00 40.00
Arg East 762 658.68 328.50 918.99 1.40 9,338.00 0.00
Arg FW 74 2,089.58 1,605.50 1,862.26 0.89 7,677.00 5.00
Arg SC 368 774.21 233.99 1,407.98 1.82 11,434.00 5.00
Arg West 580 1,385.88 568.01 2,560.15 1.85 29,746.00 0.00
San Miguel 324 1,639.63 1,078.00 1,599.89 0.95 8,747.00 11.42
LD North 611 495.32 343.00 586.20 1.18 4,382.00 0.05
LD South 216 600.52 430.50 623.24 1.04 5,182.00 0.00
LD West 194 239.96 118.50 267.00 1.11 1,236.00 0.05
La Prieta 8 483.38 190.00 600.92 1.24 1,997.00 58.00
Recompensa 452 283.54 158.50 378.57 1.34 2,893.00 0.00
Rosario 263 859.79 604.00 838.81 0.98 5,055.00 0.00
San Gregorio 281 1,436.30 1,190.00 1,110.62 0.77 5,541.00 5.40
San Jorge 152 1,223.31 869.00 1,324.61 1.08 8,906.00 0.00

TABLE A25-2 CHIP SAMPLE STATISTICS - GOLD
Great Panther Silver Limited - Topia Mine

Au              
Zone Number Mean Median  SD  CV  Max Min
Arg Cen 193 0.50 0.25 0.88 1.76 10.00 0.00
Arg East 762 0.65 0.33 0.93 1.42 15.00 0.00
Arg FW 74 0.78 0.48 0.98 1.26 5.84 0.00
Arg SC 368 0.55 0.25 1.05 1.90 11.00 0.00
Arg West 580 5.63 0.25 124.57 22.11 3,003.00 0.00
San Miguel 323 0.81 0.56 0.87 1.08 7.38 0.00
LD North 611 2.56 1.57 8.94 3.50 214.00 0.00
LD South 216 2.59 1.92 2.15 0.83 13.31 0.00
LD West 194 4.55 3.96 4.09 0.90 36.28 0.00
La Prieta 8 5.78 4.69 5.42 0.94 17.39 0.15
Recompensa 452 14.59 12.29 14.81 1.02 232.00 0.00
Rosario 263 0.21 0.11 0.35 1.69 3.42 0.00
San Gregorio 281 0.38 0.26 0.46 1.22 3.40 0.00
San Jorge 152 0.75 0.35 0.66 0.88 3.88 0.00

Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page 25-2



  www.rpacan.com

TABLE A25-3 CHIP SAMPLE STATISTICS - LEAD
Great Panther Silver Limited - Topia Mine

Pb              
Zone Number Mean Median SD CV Max Min
Arg Cen 193 5.38 1.86 7.83 1.46 44.68 0.00
Arg East 762 7.96 4.40 9.21 1.16 46.50 0.00
Arg FW 73 15.88 11.34 13.26 0.83 53.42 0.00
Arg SC 368 5.13 1.70 7.55 1.47 43.00 0.00
Arg West 579 8.13 3.06 11.00 1.35 69.44 0.00
San Miguel 323 2.70 2.17 2.19 0.81 12.40 0.00
LD North 611 8.29 4.86 9.75 1.18 65.16 0.00
LD South 216 9.55 6.30 9.99 1.05 57.12 0.00
LD West 194 3.47 1.05 4.81 1.38 30.24 0.00
La Prieta 8 2.13 1.07 3.00 1.41 9.90 0.30
Recompensa 452 5.39 3.34 6.95 1.25 80.60 0.00
Rosario 263 4.53 2.86 4.68 1.03 30.58 0.00
San Gregorio 281 6.72 4.70 6.33 0.94 39.48 0.00
San Jorge 152 3.08 2.31 3.08 1.00 16.94 0.00

TABLE A25-4 CHIP SAMPLE STATISTICS - ZINC
Great Panther Silver Limited - Topia Mine

Zn              
Zone Number Mean Median SD CV Max Min
Arg Cen 193 1.27 0.00 3.52 2.77 38.58 0.00
Arg East 762 0.05 0.00 0.48 9.68 7.15 0.00
Arg FW 73 3.09 0.92 4.51 1.46 18.19 0.00
Arg SC 368 0.00 0.00 0.00 0.00 0.00 0.00
Arg West 579 1.79 0.18 3.10 1.74 26.00 0.00
San Miguel 323 5.03 4.02 4.20 0.83 18.62 0.00
LD North 610 8.34 5.66 8.70 1.04 42.88 0.00
LD South 216 9.55 6.88 9.59 0.96 39.42 0.00
LD West 194 4.81 1.54 6.39 1.33 34.08 0.00
La Prieta 8 3.36 1.66 4.20 1.25 13.30 0.00
Recompensa 452 6.46 4.06 7.02 1.09 36.32 0.00
Rosario 263 5.40 3.47 5.52 1.02 38.56 0.00
San Gregorio 281 11.82 11.70 8.24 0.70 36.56 0.04
San Jorge 152 6.93 5.51 5.96 0.86 26.64 0.00

Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page 25-3



  www.rpacan.com

26 APPENDIX 3

MINERAL RESOURCE TABLES BY ZONE

Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page 26-1


  www.rpacan.com

TABLE A26-1 MEASURED MINERAL RESOURCES
Great Panther Silver Limited - Topia Mine

Zone   Tonnage     Ag     Au     Pb     Zn  
    (t)     (g/t)     (g/t)     (%)     (%)  
Argentina Central (ARC)   2,190     1,076     0.73     9.28     1.49  
Argentina East (ARE)   9,711     713     0.73     8.54     0.00  
Argentina FW (ARFW)   3,514     1,606     0.54     14.68     3.70  
Argentina Santa Cruz (ARSC)   3,281     994     0.70     6.75     0.00  
Argentina West (ARW)   5,940     1,173     0.43     8.12     2.88  
Hormiguera (HM)   3,405     997     0.47     1.77     3.36  
La Dura North (LDN)   8,878     491     2.28     10.32     11.59  
La Dura South (LDS)   1,982     609     2.29     14.82     1.48  
La Dura West (LDW)   1,725     366     5.56     4.24     8.35  
Recompensa (REC)   4,027     163     10.31     3.64     5.27  
El Rosario (ROS)   7,393     867     0.21     4.72     5.69  
San Gregorio (SG)   5,072     1,057     0.34     5.34     11.09  
San Jorge (SJ)   611     730     0.40     1.70     4.29  
                               
Total Measured   57,700     825     1.67     7.57     4.97  

Notes:

 
1.

CIM definitions were followed for Mineral Resources.

2.

The Qualified Person for this Mineral Resource estimate is David W. Rennie, P.Eng.

3.

Mineral Resources are estimated at a cut-off of US$130/t.

4.

Mineral Resources are estimated using metal prices of US$1,200/oz Au, US$21.00/oz Ag, US$1.00/lb Pb, and US$1.10/lb Zn.

5.

A minimum mining width of 0.30 metres was used.

6.

Numbers may not add due to rounding.

Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page 26-2



  www.rpacan.com

TABLE A26-2 INDICATED MINERAL RESOURCES
Great Panther Silver Limited - Topia Mine

Zone   Tonnage     Ag     Au     Pb     Zn  
    (t)     (g/t)     (g/t)     (%)     (%)  
Argentina Central (ARC)   7,799     929     0.76     9.95     0.71  
Argentina East (ARE)   18,951     708     0.70     8.03     0.00  
Argentina FW (ARFW)   10,616     1,234     0.44     11.83     3.29  
Argentina Santa Cruz (ARSC)   10,538     1,048     0.76     8.00     0.00  
Argentina West (ARW)   12,370     1,253     0.50     9.11     2.50  
Hormiguera (HM)   9,022     1,034     0.44     2.02     2.95  
La Dura North (LDN)   8,673     457     2.19     9.37     12.37  
La Dura South (LDS)   5,541     630     2.16     11.27     1.61  
La Dura West (LDW)   2,592     344     5.29     4.17     7.61  
Recompensa (REC)   7,194     217     10.69     3.96     5.52  
El Rosario (ROS)   8,220     832     0.18     4.18     5.56  
San Gregorio (SG)   10,721     1,206     0.38     5.61     12.57  
San Jorge (SJ)   1,064     732     0.46     1.75     5.11  
                               
Total Indicated   113,000     883     1.50     7.50     4.06  

Notes:

 
1.

CIM definitions were followed for Mineral Resources.

2.

The Qualified Person for this Mineral Resource estimate is David W. Rennie, P.Eng.

3.

Mineral Resources are estimated at a cut-off of US$130/t.

4.

Mineral Resources are estimated using metal prices of US$1200/oz Au, US$21.00/oz Ag, US$1.00/lb Pb, and US$1.10/lb Zn.

5.

A minimum mining width of 0.30 metres was used.

6.

Numbers may not add due to rounding.

Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page 26-3



  www.rpacan.com

TABLE A26-3 INFERRED MINERAL RESOURCES
Great Panther Silver Limited - Topia Mine

Zone   Tonnage     Ag     Au     Pb     Zn  
    (t)     (g/t)     (g/t)     (%)     (%)  
Argentina Central (ARC)   22,221     961     0.8     9.8     0.9  
Argentina East (ARE)   52,726     710     0.7     8.2     0.0  
Argentina FW (ARFW)   18,552     1,326     0.5     12.5     3.4  
Argentina Santa Cruz (ARSC)   17,127     1,035     0.7     7.7     0.0  
Argentina West (ARW)   29,788     1,227     0.5     8.8     2.6  
Hormiguera (HM)   30,042     1,024     0.5     2.0     3.1  
La Dura North (LDN)   6,825     474     2.2     9.9     12.0  
La Dura South (LDS)   2,021     624     2.2     12.2     1.6  
La Dura West (LDW)   0     0     0.0     0.0     0.0  
Recompensa (REC)   24,769     197     10.6     3.8     5.4  
El Rosario (ROS)   32,074     849     0.2     4.4     5.6  
San Gregorio (SG)   25,992     1,158     0.4     5.5     12.1  
San Jorge (SJ)   10,615     731     0.4     1.7     4.8  
La Prieta (LP)   12,289     375     1.4     3.1     3.5  
                               
Total Inferred   285,000     868     1.5     6.5     3.7  

Notes:

 
1.

CIM definitions were followed for Mineral Resources.

2.

The Qualified Person for this Mineral Resource estimate is David W. Rennie, P.Eng.

3.

Mineral Resources are estimated at a cut-off of US$130/t.

4.

Mineral Resources are estimated using metal prices of US$1200/oz Au, US$21.00/oz Ag, US$1.00/lb Pb, and US$1.10/lb Zn.

5.

A minimum mining width of 0.30 metres was used.

6.

Numbers may not add due to rounding.

Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page 26-4



  www.rpacan.com

27 APPENDIX 4

MODELED VARIOGRAM RESULTS

Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page 27-1


  www.rpacan.com

FIGURE A27-1 CORRELOGRAM FOR AG X L – HORIZ. DIR.

FIGURE A27-2 CORRELOGRAM FOR AG X L – VERT. DIR.

Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page 27-2



  www.rpacan.com

FIGURE A27-3 CORRELOGRAM FOR AU X L – HORIZ. DIR.

FIGURE A27-4 CORRELOGRAM FOR AU X L – VERT. DIR.

Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page 27-3



  www.rpacan.com

FIGURE A27-5 CORRELOGRAM FOR PB X L – HORIZ. DIR.

FIGURE A27-6 CORRELOGRAM FOR PB X L – VERT. DIR.

Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page 27-4



  www.rpacan.com

FIGURE A27-7 CORRELOGRAM FOR ZN X L – HORIZ. DIR.

FIGURE A27-8 CORRELOGRAM FOR ZN X L – VERT. DIR.

Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page 27-5



  www.rpacan.com

FIGURE A27-9 CORRELOGRAM FOR TRUE WIDTH – HORIZ. DIR.

FIGURE A27-10 CORRELOGRAM FOR TRUE WIDTH – VERT. DIR.

Great Panther Silver Limited – Topia Mine  
Technical Report NI 43-101 – March 28, 2011 Page 27-6