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Investments (Tables)
6 Months Ended
Jun. 30, 2019
Investment in Marketable Securities [Abstract]  
Investments
The Company makes strategic investments in equity and debt securities of silver and gold exploration and development companies.
 
At June 30, 2019
In thousands
Cost
 
Gross
Unrealized
Losses
 
Gross
Unrealized
Gains
 
Estimated
Fair Value
Equity Securities
 
 
 
 
 
 
 
Metalla Royalty & Streaming Ltd.
$
10,985

 
$

 
$
6,528

 
$
17,513

Rockhaven Resources, Ltd.
2,064

 
(502
)
 

 
1,562

Other
1,305

 
(923
)
 

 
382

Equity securities
$
14,354

 
$
(1,425
)
 
$
6,528

 
$
19,457




 
At December 31, 2018
In thousands
Cost
 
Gross
Unrealized
Losses
 
Gross
Unrealized
Gains
 
Estimated
Fair Value
Equity Securities
 
 
 
 
 
 
 
Metalla Royalty & Streaming Ltd.
$
10,695

 
$

 
$
2,852

 
$
13,547

Rockhaven Resources, Ltd.
2,064

 
(452
)
 

 
1,612

Other
1,376

 
(946
)
 

 
430

Equity securities
$
14,135

 
$
(1,398
)
 
$
2,852

 
$
15,589

 
 
 
 
 
 
 
 
Debt Securities
 
 
 
 
 
 
 
Metalla Royalty & Streaming Ltd.
$
2,271

 
$
(54
)
 
$

 
$
2,217

 
 
 
 
 
 
 
 
Equity and debt securities
$
16,406

 
$
(1,452
)
 
$
2,852

 
$
17,806