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EQUITY (Tables)

12 Months Ended

Dec. 31, 2022

Equity [Abstract]

Share-based Payment Arrangement, Expensed and Capitalized, Amount

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

						Years Ended December 31,
						2022									2021									2020
Cost of sales (1)						$			797						$			1,105						$			2,164
General and administrative expense									5,579									11,867									8,500
Exploration, evaluation and reclamation expense									97									105									169
Other operating expenses, net									—									1,722									5,018
						$			6,473						$			14,799						$			15,851

(1)    Excludes depreciation, depletion, and amortization.

Schedule of Stock Options Roll Forward

The following table summarizes the changes in stock options outstanding during the year ended December 31, 2022 (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 as of January 1, 2022						261						$			16.32
Granted						—									—
Exercised						(180)									13.68
Forfeited						(4)									21.13
Expired						(4)									21.48
Balance as of December 31, 2022						73									18.53						4.0						$			60
Vested and exercisable at December 31, 2022						64									18.08						3.9						$			60

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:

			2022									2021									2020
Expected dividend yield (%)						N/A									N/A									—
Risk-free interest rate (%)						N/A									N/A									1.31
Expected life (years)						N/A									N/A									4.20
Expected volatility (%)						N/A									N/A									45.80
Weighted-average grant-date fair value (per option)						N/A						$			N/A						$			17.76
Intrinsic value of options exercised (in thousands)			$			840						$			4,814						$			9,780
Fair value of options vested (in thousands)			$			337						$			1,430						$			5,006

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, 2022 (in thousands except per share amounts):

						Number of Shares						Weighted Grant Date Fair Value Per Share									Aggregate Intrinsic Value
Balance as of January 1, 2022						682						$			23.95
Granted						69									17.31
Exercised/Released						(229)									15.74
Canceled/Forfeited						—									—
Reinvested						10									15.13
Balance as of December 31, 2022						532									26.46						$			8,331

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, 2022 (in thousands except per share amounts):

						Number of Shares						Weighted Average Grant Date Fair Value									Aggregate intrinsic value
Balance as of January 1, 2022						869						$			23.10
Granted						412									17.83
Exercised/Released						(650)									21.48
Canceled/Forfeited						(62)									17.63
Reinvested						10									18.18
Balance as of December 31, 2022						579									21.49						$			9,071

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, 2022:

						Number of Shares						Weighted Average Grant Date Fair Value									Aggregate Intrinsic Value
Balance as of January 1, 2022						800						$			25.34
Granted						305									18.06
Exercised/Released						(432)									21.83
Canceled/Forfeited						(36)									19.07
Reinvested						12									18.98
Balance as of December 31, 2022						649									24.49						$			10,182

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