| Exploration and evaluation assets [member] | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| This member stands for exploration and evaluation expenditures recognised as assets in accordance with the entity's accounting policy. Exploration and evaluation expenditures are expenditures incurred by an entity in connection with the exploration for, and evaluation of, mineral resources before the technical feasibility and commercial viability of extracting a mineral resource are demonstrable. | en | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |
| Sócmhainní taiscéalaíochta agus meastóireachta [member] | ga | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Seasann an ball seo do chaiteachas taiscéalaíochta agus meastóireachta a aithnítear mar shócmhainní i gcomhréir le beartas cuntasaíochta an eintitis. Is éard atá i gceist le caiteachas taiscéalaíochta agus meastóireachta caiteachas a thabhaíonn eintiteas i ndáil le taiscéalaíocht agus meastóireacht a dhéanamh ar acmhainní mianracha sular féidir an fhéidearthacht theicniúil agus an inmharthanacht tráchtála a bhaineann le hastarraingt acmhainne mianraí a léiriú. | ga | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |