SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)

12 Months Ended

Dec. 31, 2021

The major categories of plant and equipment are depreciated on a straight-line basis using the estimated lives indicated below:


Vehicles			5 years - 7 years
Mining equipment			3 years - 21 years
Mobile equipment components			2 years - 7 years
Buildings			5 years - 21 years
Mine plant equipment			3 years - 21 years
Underground infrastructure			5 years - 21 years
ROU assets - plant and equipment (1)			10 years - 21 years

(1)For ROU assets, the depreciation period indicated above represents the period from lease commencement date to the earlier of the end of the useful life of the underlying asset or the end of the lease term.

The components of Mineral properties, plant and equipment, net were as follows (in thousands):


	December 31,
	2021		2020
Plant and equipment (1)	$	1,762,833	$	1,640,705
Construction in process		36,841		40,290
Mineral properties subject to depletion		1,331,615		1,282,208
Mineral properties not yet subject to depletion		141,629		222,938
Exploration and evaluation assets		927,176		930,606
Total mineral properties, plant, and equipment		4,200,094		4,116,747
Accumulated depreciation, plant and equipment		(529,635)		(423,326)
Accumulated depreciation, mineral properties		(420,695)		(223,682)
Mineral properties, plant, and equipment, net	$	3,249,764	$	3,469,739

(1)As of December 31, 2021 and 2020, plant and equipment includes finance lease right-of-use assets with a carrying amount of $114.9 million and $112.8 million, respectively.