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Revenue
9 Months Ended
Sep. 30, 2021
Revenue  
Revenue

4. Revenue

The Company derives its revenue from the sale of doré and concentrates. The following table presents the Company’s net sales for each period presented, disaggregated by source:

For the three months ended September 30, 

For the nine months ended September 30, 

2021

2020

2021

2020

(in thousands)

(in thousands)

Doré sales, net

Gold

$

1,634

$

1,495

$

6,816

$

5,155

Silver

38

878

643

2,232

Less: Refining charges

(21)

(67)

(112)

(212)

Total doré sales, net

1,651

2,306

7,347

7,175

Concentrate sales

Gold

8,709

5,211

22,904

13,894

Silver

6,179

6,857

19,443

14,638

Copper

2,447

2,911

9,547

6,470

Lead

3,641

3,501

8,641

8,730

Zinc

9,187

10,894

27,193

25,110

Less: Treatment and refining charges

(2,307)

(5,795)

(8,098)

(14,930)

Total concentrate sales, net

27,856

23,579

79,630

53,912

Realized (loss) gain embedded derivative, net

(246)

653

204

250

Unrealized (loss) gain embedded derivative, net

(232)

(103)

(48)

(232)

Total sales, net

$

29,029

$

26,435

$

87,133

$

61,105