Derivative Average Price.

No definition available.

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- Definition

Derivative instruments Settlement.

+ References

No definition available.

+ Details

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- Definition

Outstanding provisionally priced sales consists of Gold.

+ References

No definition available.

+ Details

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- Definition

Outstanding provisionally priced sales consists of silver.

+ References

No definition available.

+ Details

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- Definition

Price per ounce under agreement

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	instant

- Definition

Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

+ Details

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Period Type:	instant

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

+ Details

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Namespace Prefix:	invest_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5618551-113959

+ Details

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- Details

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- Details

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- Details

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- Details

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Derivative Financial Instruments (Details)	3 Months Ended		9 Months Ended
Derivative Financial Instruments (Details)	Sep. 30, 2016 USD ($) oz $ / oz	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) oz $ / oz	Sep. 30, 2015 USD ($)
Derivative [Line Items]
Gain (loss) on derivative instruments	$ (961,000)	$ 5,786,000	$ (13,235,000)	$ 3,657,000
Derivative instruments Settlement
Price per ounce under agreement	416		416
Silver concentrate sales agreements [Member] \| 2016 [Member]
Derivative instruments Settlement
Derivative, notional amount	$ 5,349,000		$ 5,349,000
Derivative average price \| $ / oz	19.35		19.35
Outstanding Provisionally Priced Sales Consists of Silver \| oz	276,448		276,448
Silver concentrate sales agreements [Member] \| Thereafter [Member]
Derivative instruments Settlement
Derivative, notional amount	$ 0		$ 0
Derivative average price \| $ / oz	0		0
Notional ounces \| oz	0		0
Gold concentrates sales agreements [Member] \| 2016 [Member]
Derivative instruments Settlement
Derivative, notional amount	$ 32,150,000		$ 32,150,000
Derivative average price \| $ / oz	1,315		1,315
Outstanding Provisionally Priced Sales Consists of Gold \| oz	24,449		24,449
Gold concentrates sales agreements [Member] \| Thereafter [Member]
Derivative instruments Settlement
Derivative, notional amount	$ 0		$ 0
Derivative average price \| $ / oz	0		0
Notional ounces \| oz	0		0