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Financial risk management - Credit risk - Aging of trade and other receivables (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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AGING TRADE AND OTHER RECEIVABLES |  |
Trade and other receivables | $ 26.4 | $ 77.1
Rainy River |  |
AGING TRADE AND OTHER RECEIVABLES |  |
Trade and other receivables | 3.5 | 10.4
New Afton |  |
AGING TRADE AND OTHER RECEIVABLES |  |
Trade and other receivables | 6.1 | 9.4
Cerro San Pedro |  |
AGING TRADE AND OTHER RECEIVABLES |  |
Trade and other receivables | 2.5 | 2.3
Corporate |  |
AGING TRADE AND OTHER RECEIVABLES |  |
Trade and other receivables | 14.3 | $ 55.0
0-30 days |  |
AGING TRADE AND OTHER RECEIVABLES |  |
Trade and other receivables | 6.3 |
0-30 days | Rainy River |  |
AGING TRADE AND OTHER RECEIVABLES |  |
Trade and other receivables | 3.0 |
0-30 days | New Afton |  |
AGING TRADE AND OTHER RECEIVABLES |  |
Trade and other receivables | 1.7 |
0-30 days | Cerro San Pedro |  |
AGING TRADE AND OTHER RECEIVABLES |  |
Trade and other receivables | 0.1 |
0-30 days | Corporate |  |
AGING TRADE AND OTHER RECEIVABLES |  |
Trade and other receivables | 1.5 |
31-60 days |  |
AGING TRADE AND OTHER RECEIVABLES |  |
Trade and other receivables | 1.1 |
31-60 days | Rainy River |  |
AGING TRADE AND OTHER RECEIVABLES |  |
Trade and other receivables | 0.0 |
31-60 days | New Afton |  |
AGING TRADE AND OTHER RECEIVABLES |  |
Trade and other receivables | 1.0 |
31-60 days | Cerro San Pedro |  |
AGING TRADE AND OTHER RECEIVABLES |  |
Trade and other receivables | 0.1 |
31-60 days | Corporate |  |
AGING TRADE AND OTHER RECEIVABLES |  |
Trade and other receivables | 0.0 |
61-90 days |  |
AGING TRADE AND OTHER RECEIVABLES |  |
Trade and other receivables | 3.4 |
61-90 days | Rainy River |  |
AGING TRADE AND OTHER RECEIVABLES |  |
Trade and other receivables | 0.0 |
61-90 days | New Afton |  |
AGING TRADE AND OTHER RECEIVABLES |  |
Trade and other receivables | 3.4 |
61-90 days | Cerro San Pedro |  |
AGING TRADE AND OTHER RECEIVABLES |  |
Trade and other receivables | 0.0 |
61-90 days | Corporate |  |
AGING TRADE AND OTHER RECEIVABLES |  |
Trade and other receivables | 0.0 |
91-120 days |  |
AGING TRADE AND OTHER RECEIVABLES |  |
Trade and other receivables | 0.0 |
91-120 days | Rainy River |  |
AGING TRADE AND OTHER RECEIVABLES |  |
Trade and other receivables | 0.0 |
91-120 days | New Afton |  |
AGING TRADE AND OTHER RECEIVABLES |  |
Trade and other receivables | 0.0 |
91-120 days | Cerro San Pedro |  |
AGING TRADE AND OTHER RECEIVABLES |  |
Trade and other receivables | 0.0 |
91-120 days | Corporate |  |
AGING TRADE AND OTHER RECEIVABLES |  |
Trade and other receivables | 0.0 |
Over 120 days |  |
AGING TRADE AND OTHER RECEIVABLES |  |
Trade and other receivables | 15.6 |
Over 120 days | Rainy River |  |
AGING TRADE AND OTHER RECEIVABLES |  |
Trade and other receivables | 0.5 |
Over 120 days | New Afton |  |
AGING TRADE AND OTHER RECEIVABLES |  |
Trade and other receivables | 0.0 |
Over 120 days | Cerro San Pedro |  |
AGING TRADE AND OTHER RECEIVABLES |  |
Trade and other receivables | 2.3 |
Over 120 days | Corporate |  |
AGING TRADE AND OTHER RECEIVABLES |  |
Trade and other receivables | $ 12.8 |

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