| Intangible exploration and evaluation assets [member] | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| This member stands for a class of intangible assets representing intangible exploration and evaluation assets. [Refer: Exploration and evaluation assets [member]] | en | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |
| Immaterielle efterforsknings- og vurderingsaktiver [member] | da | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Dette element står for en kategori af immaterielle anlægsaktiver, der repræsenterer immaterielle efterforsknings- og vurderingsaktiver. [Reference: efterforsknings- og vurderingsaktiver [member]] | da | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |