Note 11 - Derivative Instruments (Tables)

6 Months Ended

Jun. 30, 2019

Notes Tables

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

June 30, 2019	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
2019 settlements		—		—		15,047		3,329		N/A		N/A	$	1.19	$	0.89
Contracts on forecasted sales
2019 settlements		—		—		25,629		1,653		N/A		N/A	$	1.25	$	0.96
2020 settlements		—		—		12,125		1,102		N/A		N/A	$	1.27	$	0.96

December 31, 2018

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

2019 settlements

842

4

18,450

2,700

$

14.69

$

1,260

$

1.15

$

0.89

June 30, 2019	Ounces under contract (in 000's)				Average price per ounce
	Silver		Gold		Silver		Gold
	(ounces)		(ounces)		(ounces)		(ounces)
Contracts on forecasted sales
2019 settlements		3,059		106	$	14.56	$	1,317