| Notes - Exploration for and evaluation of mineral resources | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Notes - Exploration for and evaluation of mineral resources, Consolidated financial statements (IFRS) [heading] | en | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |
| 注記事項-鉱物資源の探査及び評価 | ja | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| 注記事項-鉱物資源の探査及び評価、連結財務諸表(IFRS) [目次項目] | ja | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |