| 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, Condensed semi-annual consolidated financial statements (IFRS) [text block] | 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、要約中間連結財務諸表(IFRS) [テキストブロック] | ja | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |