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LEASES (Tables)
 12 Months Ended
Dec. 31, 2021
Leases [Abstract]  
Lease, Cost
The components of the Company’s leases presented in the Consolidated Balance Sheets were as follows (in thousands):
December 31,
20212020   
Finance lease right-of-use assets, net (included in Mineral properties, plant and equipment, net)
$
114,882 
$
112,808 
Operating lease right-of-use assets (included in Other non-current assets)
7,530 9,362 
Total lease right-of-use-assets
$122,412 $122,170 
 
    
Short-term finance lease liabilities (included in Finance lease liabilities)
$
12,439 
$
3,568 
Short-term operating lease liabilities (included in Accrued liabilities and other)
2,238 1,954 
Long-term finance lease liabilities (included in Finance Lease liabilities)
 105,965  109,544 
Long-term operating lease liabilities (included in Other non-current liabilities)
 5,525  7,530 
Total lease liabilities
$126,167 $122,596 
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):
Years Ended December 31,
20212020   2019
Operating leases$2,986 $1,260 $521 
     
Finance leases:
Amortization of lease cost
 
2,517 
 
92 
 
70 
Interest expense on lease liabilities
274 12 14 
Variable and short-term leases 10,661  3,615 — 
Total$16,438 $4,979 $605 
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):
Years Ended December 31,
20212020   2019
Operating leases within cash flows from operating activities
$
2,986 $1,260 $521 
Finance leases within cash flows from financing activities
$
10,441 $3,623 $554 
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:
Years Ended December 31,
20212020   
Weighted-average remaining lease term - operating leases (in years)5.55.9
Weighted-average remaining lease term - finance leases (in years)19.120.7
Weighted-average discount rate - operating leases8.6 %9.4 %
Weighted-average discount rate - finance leases4.5 %4.6 %
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, 2021 (in thousands):
Operating LeasesFinance Leases
2022
$
2,950 
$
16,907 
2023
1,520 8,532 
2024
1,374 8,532 
2025
1,218 8,532 
2026
1,234 8,532 
Thereafter1,548 122,023 
Total minimum lease payments
$
9,844 
$
173,058 
Less: amounts representing interest
2,081 54,654 
Present value of net minimum lease payments
7,763 118,404 
Less: current portion of lease liabilities
2,238 12,439 
Long-term lease liabilities  
$
5,525 
$
105,965 
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, 2021 (in thousands):
Operating LeasesFinance Leases
2022
$
2,950 
$
16,907 
2023
1,520 8,532 
2024
1,374 8,532 
2025
1,218 8,532 
2026
1,234 8,532 
Thereafter1,548 122,023 
Total minimum lease payments
$
9,844 
$
173,058 
Less: amounts representing interest
2,081 54,654 
Present value of net minimum lease payments
7,763 118,404 
Less: current portion of lease liabilities
2,238 12,439 
Long-term lease liabilities  
$
5,525 
$
105,965