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Supplemental cash flow information (Tables) | 12 Months Ended
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Dec. 31, 2018
Statement Of Cash Flows Disclosure [Abstract] |
Statements of detailed information of cash flow |
|  |  | 2018 |  |  | 2017
Changes in non-cash working capital: |  |  |  |  |
| Accounts receivable | $ | (44,353) |  | $ | (174,613)
| Inventories |  | 241,496 |  |  | 299,980
| Supplies and prepaid expenses |  | 52,192 |  |  | 15,436
| Accounts payable and accrued liabilities |  | (39,616) |  |  | (64,689)
Reclamation payments |  | (31,311) |  |  | (14,334)
Other |  | 4,654 |  |  | 25,277
Total | $ | 183,062 |  | $ | 87,057
Reconciliation of liabilities arising from financing activities |
|  |  | Long-term |  |  | Interest |  |  | Dividends |  |  | Share |  |  |
|  |  | debt(a) |  |  | payable |  |  | payable |  |  | capital |  |  | Total
Balance at January 1, 2018 | $ | 1,494,471 |  | $ | 14,970 |  | $ | 39,579 |  | $ | 1,862,652 |  | $ | 3,411,672
Changes from financing cash flows: |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Dividends paid |  | - |  |  | - |  |  | (71,224) |  |  | - |  |  | (71,224)
| Interest paid |  | - |  |  | (72,976) |  |  | - |  |  | - |  |  | (72,976)
Total cash changes |  | - |  |  | (72,976) |  |  | (71,224) |  |  | - |  |  | (144,200)
Non-cash changes: |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Amorization of issue costs |  | 1,200 |  |  | - |  |  | - |  |  | - |  |  | 1,200
| Dividends declared |  | - |  |  | - |  |  | 31,645 |  |  | - |  |  | 31,645
| Interest expense |  | - |  |  | 71,839 |  |  | - |  |  | - |  |  | 71,839
| Foreign exchange |  | - |  |  | (294) |  |  | - |  |  | - |  |  | (294)
Total non-cash changes |  | 1,200 |  |  | 71,545 |  |  | 31,645 |  |  | - |  |  | 104,390
Balance at December 31, 2018 | $ | 1,495,671 |  | $ | 13,539 |  | $ | - |  | $ | 1,862,652 |  | $ | 3,371,862
(a) Includes current portion of long-term debt |  |  |  |  |  |  |  |  |  |  |  |  |  |

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