| Tangible 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 property, plant and equipment representing tangible 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 |
| Hmotný majetok z prieskumu a vyhodnocovania [member] | sk | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Tento člen predstavuje triedu nehnuteľností, strojov a zariadení, ktorá predstavuje hmotný majetok z prieskumu a vyhodnocovania. {Odkaz: majetok z prieskumu a vyhodnocovania [member]} | sk | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |