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Derivatives (Tables)
9 Months Ended
Sep. 30, 2021
Derivatives  
Summary of unsettled sales contracts

Gold

Silver

Copper

Lead

Zinc

Total

(ounces)

(ounces)

(tonnes)

(tonnes)

(tonnes)

Under contract

2,579

118,576

146

740

3,148

Average forward price (per ounce or tonne)

$

1,770

$

23.07

$

9,324

$

2,261

$

2,988

Unsettled sales contracts value (in thousands)

$

4,565

$

2,736

$

1,361

$

1,673

$

9,406

$

19,741