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Deferred Consideration (Tables) | 9 Months Ended
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Sep. 30, 2021
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Summary of Assumptions Used in Valuation of Deferred Consideration | The Company determined the present value of the deferred consideration of $224,953 and $230,137 at September 30, 2021 and December 31, 2020 using the following assumptions:
|  | September 30, 2021 |  |  | December 31, 2020 |
Forward-looking gold price (low) – per ounce |  | $ | 1,756 |  |  | $ | 1,903 |
Forward-looking gold price (high) – per ounce |  | $ | 2,906 |  |  | $ | 2,662 |
Forward-looking gold price (weighted average) – per ounce |  | $ | 2,093 |  |  | $ | 2,117 |
Discount rate |  |  | 9.0 | % |  |  | 9.0 | %
Perpetual growth rate |  |  | 1.4 | % |  |  | 0.9 | %
Schedule of Deferred Consideration | During the three and nine months ended September 30, 2021 and 2020, the Company recognized the following in respect of deferred consideration:
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Contractual gold payments |  | $ | 4,250 |  |  | $ | 4,539 |  |  | $ | 12,834 |  |  | $ | 12,362 |
Contractual gold payments – gold ounces paid |  |  | 2,375 |  |  |  | 2,375 |  |  |  | 7,125 |  |  |  | 7,125 |
Gain/(loss) on revaluation of deferred consideration – gold payments (1) |  | $ | 1,737 |  |  | $ | (8,870 | ) |  | $ | 5,066 |  |  | $ | (34,436 | )
(1) | Gains on revaluation of deferred consideration – gold payments result from a decrease in spot gold prices, a decrease in the forward-looking price of gold, a decrease in the perpetual growth rate and an increase in the discount rate used to compute the present value of the annual payment obligations. Losses on revaluation of deferred consideration – gold payments result from an increase in spot gold prices, an increase in the forward-looking price of gold, an increase in the perpetual growth rate and a decrease in the discount rate used to compute the present value of the annual payment obligations.

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