Note 11 - Derivative Instruments (Tables)

9 Months Ended

Sep. 30, 2016

Notes Tables

Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block]

September 30, 2016	Ounces/pounds under contract (in 000's)								Average price per ounce/pound
	Silver		Gold		Zinc		Lead		Silver		Gold		Zinc		Lead
	(ounces)		(ounces)		(pounds)		(pounds)		(ounces)		(ounces)		(pounds)		(pounds)
Contracts on provisional sales
2016 settlements		1,124		2		25,739		13,117	$	19.65	$	1,338	$	1.03	$	0.92
2017 settlements		—		—		3,858		—	$	—	$	—	$	1.08	$	—

December 31, 2015

Ounces/pounds under contract (in 000's)

Average price per ounce/pound

Silver

Gold

Zinc

Lead

Silver

Gold

Zinc

Lead

(ounces)

(ounces)

(pounds)

(pounds)

(ounces)

(ounces)

(pounds)

(pounds)

Contracts on provisional sales

2016 settlements

1,368

5

23,755

8,433

$

14.12

$

1,076

$

0.71

$

0.77