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Supplemental cash flow information (Tables) | 12 Months Ended
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Dec. 31, 2019
Statement Of Cash Flows Disclosure [Abstract] |
Statements of detailed information of cash flow |
|  |  | 2019 |  |  | 2018
Changes in non-cash working capital: |  |  |  |  |
| Accounts receivable | $ | 58,488 |  | $ | (44,353)
| Inventories |  | 113,388 |  |  | 241,496
| Supplies and prepaid expenses |  | 3,612 |  |  | 52,192
| Accounts payable and accrued liabilities |  | (62,250) |  |  | (39,616)
Reclamation payments |  | (32,390) |  |  | (31,311)
Other |  | 15,630 |  |  | 4,654
Total | $ | 96,478 |  | $ | 183,062
Reconciliation of liabilities arising from financing activities |
|  |  | Long-term |  |  | Interest |  |  | Dividends |  |  | Share |  |  |
|  |  | debt(a) |  |  | payable |  |  | payable |  |  | capital |  |  | Total
Balance at January 1, 2019 | $ | 1,495,671 |  | $ | 13,539 |  | $ | - |  | $ | 1,862,652 |  | $ | 3,371,862
Changes from financing cash flows: |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Dividends paid |  | - |  |  | - |  |  | (31,613) |  |  | - |  |  | (31,613)
| Interest paid |  | - |  |  | (72,484) |  |  | - |  |  | - |  |  | (72,484)
| Shares issued, stock option plan |  | - |  |  | - |  |  | - |  |  | 81 |  |  | 81
| Repayment of long-term debt |  | (500,000) |  |  | - |  |  | - |  |  | - |  |  | (500,000)
Total cash changes |  | (500,000) |  |  | (72,484) |  |  | (31,613) |  |  | 81 |  |  | (604,016)
Non-cash changes: |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Amorization of issue costs |  | 1,047 |  |  | - |  |  | - |  |  | - |  |  | 1,047
| Dividends declared |  | - |  |  | - |  |  | 31,613 |  |  | - |  |  | 31,613
| Interest expense |  | - |  |  | 61,780 |  |  | - |  |  | - |  |  | 61,780
| Lease interest expense |  | - |  |  | 309 |  |  | - |  |  | - |  |  | 309
| Shares issued, stock option plan |  | - |  |  | - |  |  | - |  |  | 16 |  |  | 16
| Foreign exchange |  | - |  |  | (114) |  |  | - |  |  | - |  |  | (114)
Total non-cash changes |  | 1,047 |  |  | 61,975 |  |  | 31,613 |  |  | 16 |  |  | 94,651
Balance at December 31, 2019 | $ | 996,718 |  | $ | 3,030 |  | $ | - |  | $ | 1,862,749 |  | $ | 2,862,497
(a) Includes current portion of long-term debt |  |  |  |  |  |  |  |  |  |  |  |  |  |

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