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STOCK-BASED COMPENSATION (Tables)

12 Months Ended

Dec. 31, 2021

Share-based Payment Arrangement [Abstract]

Share-based Payment Arrangement, Expensed and Capitalized, Amount

Stock-based compensation expense has been recognized as follows (in thousands):

						Years Ended December 31,
						2021									2020									2019
Production costs						$			1,105						$			2,164						$			1,451
General and administrative expense									11,867									8,500									12,814
Exploration, evaluation and reclamation expense									105									169									159
Transaction and integration expense									1,722									5,018									—
Income tax benefits recognized									—									—									—
						$			14,799						$			15,851						$			14,424

Schedule of Stock Options Roll Forward

The following table summarizes the changes in stock options outstanding during the year ended December 31, 2021 (in thousands except per share amounts):

						Number of Options						Weighted Average Exercise Price Per Share									Weighted Average Remaining Contractual Term (years)						Aggregate Intrinsic Value
Balance at January 1, 2021						1,405						$			13.54
Granted						—									—
Exercised						(818)									10.14
Forfeited						(318)									20.12
Expired						(8)									8.57
Balance at December 31, 2021						261									16.32						4.1						$			774
Vested and exercisable at December 31, 2021						200									15.59						3.9						$			677

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions

The following table includes the assumptions used and other information related to stock options during the years ended December 31:

			2021									2020									2019
Expected dividend yield (%)						N/A									—									—
Risk-free interest rate (%)						N/A									1.31									1.78
Expected life (years)						N/A									4.20									4.20
Expected volatility (%)						N/A									45.80									45.80
Weighted-average grant-date fair value (per option)						N/A						$			17.76						$			11.75
Intrinsic value of options exercised (in thousands)			$			4,814						$			9,780						$			8,382
Fair value of options vested (in thousands)			$			1,430						$			5,006						$			1,828

Share-based Payment Arrangement, Deferred Share Units, Activity

The following table summarizes the changes in DSUs and DSU Replacement Units outstanding during the year ended December 31, 2021 (in thousands except per share amounts):

						Number of Shares						Weighted Grant Date Fair Value Per Share									Aggregate Intrinsic Value
Balance at January 1, 2021						748						$			21.76
Granted						89									15.75
Exercised/Released						(165)									9.07
Canceled/Forfeited						—									—
Reinvested						10									14.51
Balance at December 31, 2021						682									23.95						$			12,072

Share-based Payment Arrangement, Restricted Stock Units, Activity

The following table summarizes the changes in RSUs and RSU Replacement Units outstanding during the year ended December 31, 2021 (in thousands except per share amounts):

						Number of Shares						Weighted Average Grant Date Fair Value									Aggregate intrinsic value
Balance at January 1, 2021						749						$			23.42
Granted						388									18.63
Exercised/Released						(197)									16.81
Canceled/Forfeited						(82)									19.82
Reinvested						11									21.34
Balance at December 31, 2021						869									23.10						$			15,370

Share-based Payment Arrangement, Performance Shares, Activity

The following table summarizes the changes in PSUs and PSU Replacement Units outstanding during the year ended December 31, 2021:

						Number of Shares						Weighted Average Grant Date Fair Value									Aggregate Intrinsic Value
Balance at January 1, 2021						1,114						$			24.69
Granted						560									20.52
Exercised/Released						(813)									21.34
Canceled/Forfeited						(71)									22.35
Reinvested						10									21.70
Balance at December 31, 2021						800									25.34						$			14,169

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Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement.

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Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year.

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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