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Inventories, net (Tables)
9 Months Ended
Sep. 30, 2021
Inventories, net  
Summary of Inventories

As of

As of

September 30, 

December 31, 

2021

2020

(Unaudited)

(in thousands)

Stockpiles - underground mine

$

796

$

648

Stockpiles - open pit mine

-

41

Concentrates

1,745

1,919

Doré, net (1)

602

459

Subtotal - product inventories

3,143

3,067

Materials and supplies (2)

7,733

6,928

Total

$

10,876

$

9,995

(1)Net of reserve of nil and $368 at September 30, 2021 and December 31, 2020, respectively.
(2)Net of reserve for obsolescence of $209 both as of September 30, 2021 and December 31, 2020.