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v3.20.1

Commitments and Contingencies - Disclosure of Detailed Information about Contractual Obligations Outstanding (Detail) $ in Thousands | Dec. 31, 2019 USD ($)
--- | ---
Contractual Obligations [Line Items] |  |
Loans and borrowings and accrued interest | $ 331,720 |
Accounts payable and accrued liabilities | 67,047 |
Reclamation obligations | 38,116 | [1]
Purchase commitments | 27,638 |
Lease commitments | 1,068 |
Total | 465,589 |
Within 1 year [member] |  |
Contractual Obligations [Line Items] |  |
Loans and borrowings and accrued interest | 77,462 |
Accounts payable and accrued liabilities | 67,047 |
Reclamation obligations | 459 | [1]
Purchase commitments | 25,008 |
Lease commitments | 365 |
Total | 170,341 |
1-2 years [member] |  |
Contractual Obligations [Line Items] |  |
Loans and borrowings and accrued interest | 53,364 |
Accounts payable and accrued liabilities | 0 |
Reclamation obligations | 3,642 | [1]
Purchase commitments | 1,541 |
Lease commitments | 204 |
Total | 58,751 |
2-3 years [member] |  |
Contractual Obligations [Line Items] |  |
Loans and borrowings and accrued interest | 52,280 |
Accounts payable and accrued liabilities | 0 |
Reclamation obligations | 4,547 | [1]
Purchase commitments | 969 |
Lease commitments | 210 |
Total | 58,006 |
3-4 years [member] |  |
Contractual Obligations [Line Items] |  |
Loans and borrowings and accrued interest | 6,983 |
Accounts payable and accrued liabilities | 0 |
Reclamation obligations | 3,204 | [1]
Purchase commitments | 112 |
Lease commitments | 216 |
Total | 10,515 |
4-5 years [member] |  |
Contractual Obligations [Line Items] |  |
Loans and borrowings and accrued interest | 141,631 |
Accounts payable and accrued liabilities | 0 |
Reclamation obligations | 3,717 | [1]
Purchase commitments | 7 |
Lease commitments | 73 |
Total | 145,428 |
Thereafter [member] |  |
Contractual Obligations [Line Items] |  |
Loans and borrowings and accrued interest | 0 |
Accounts payable and accrued liabilities | 0 |
Reclamation obligations | 22,547 | [1]
Purchase commitments | 1 |
Lease commitments | 0 |
Total | $ 22,548 |
[1] | Amount represents undiscounted future cash flows.

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