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LEASES (Tables)
 12 Months Ended
Dec. 31, 2023
Leases [Abstract]  
Lease, Cost
The components of the Company’s leases presented in the Consolidated Balance Sheets were as follows (in thousands):
December 31,
20232022
Finance lease right-of-use assets, net (included in Mineral properties, plant and equipment, net)
$
84,689 
$
101,705 
Operating lease right-of-use assets (included in Other non-current assets)
21,038 17,946 
Total lease right-of-use-assets
$105,727 $119,651 
 
    
Short-term finance lease liabilities (included in Finance lease liabilities)
$
4,555 
$
3,872 
Short-term operating lease liabilities (included in Accrued liabilities and other)
1,545 1,976 
Long-term finance lease liabilities (included in Finance Lease liabilities)
 86,141  102,434 
Long-term operating lease liabilities (included in Other non-current liabilities)
 21,009  16,969 
Total lease liabilities
$113,250 $125,251 
The components of the Company’s leases presented in the Consolidated Statements of Operations for the years ended December 31 were as follows (in thousands):
Year Ended December 31,
202320222021
Operating leases:
Lease expense
$3,648 $4,134 $2,986 
Sublease income
(958)— — 
     
Finance leases:
Amortization of lease cost
 
5,346 
 
5,346 
 
2,517 
Interest expense on lease liabilities
4,645 4,830 274 
Variable and short-term leases 3,812  1,740 10,661 
Total$16,493 $16,050 $16,438 
The components of the Company’s leases presented in the statements of cash flows for the years ended December 31 were as follows (in thousands):
Year Ended December 31,
202320222021
Operating leases within cash flows from operating activities
$
2,690 $4,134 $2,986 
Finance leases within cash flows from financing activities
$
3,870 $10,091 $10,441 

The following is a schedule of weighted-average discount rates used to determine lease liabilities and remaining lease terms for the years ended December 31:
Year Ended December 31,
20232022
Weighted-average remaining lease term - operating leases (in years)9.98.4
Weighted-average remaining lease term - finance leases (in years)17.118.1
Weighted-average discount rate - operating leases6.6 %5.2 %
Weighted-average discount rate - finance leases4.5 %4.5 %
Lessee, Operating Lease, Liability, Maturity
The following is a schedule of future minimum lease payments under noncancellable finance and operating leases as of December 31, 2023 (in thousands):
Operating LeasesFinance Leases
2024
$
2,858 
$
8,532 
20252,808 8,532 
20263,379 8,532 
20273,315 8,532 
20282,899 8,532 
Thereafter16,006 80,611 
Total minimum lease payments
$
31,265 
$
123,271 
Less: amounts representing interest
8,711 32,575 
Present value of net minimum lease payments
22,554 90,696 
Less: current portion of lease liabilities
1,545 4,555 
Long-term lease liabilities  
$
21,009 
$
86,141 
Finance Lease, Liability, Fiscal Year Maturity
The following is a schedule of future minimum lease payments under noncancellable finance and operating leases as of December 31, 2023 (in thousands):
Operating LeasesFinance Leases
2024
$
2,858 
$
8,532 
20252,808 8,532 
20263,379 8,532 
20273,315 8,532 
20282,899 8,532 
Thereafter16,006 80,611 
Total minimum lease payments
$
31,265 
$
123,271 
Less: amounts representing interest
8,711 32,575 
Present value of net minimum lease payments
22,554 90,696 
Less: current portion of lease liabilities
1,545 4,555 
Long-term lease liabilities  
$
21,009 
$
86,141