| Titre | Stream sediment indicator mineral signatures of the Casino porphyry Cu-Au-Mo deposit, Yukon, Canada |
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| Auteur | McClenaghan, M B ;
Beckett-Brown, C E; McCurdy, M W; Casselman, S G |
| Source | Economic Geology vol. 118, no. 2, 2023 p. 411-431, https://doi.org/10.5382/econgeo.4970  Accès ouvert |
| Image |  |
| Année | 2023 |
| Séries alt. | Ressources naturelles Canada, Contribution externe 20210144 |
| Éditeur | Society of Economic Geologists |
| Document | publication en série |
| Lang. | anglais |
| DOI | https://doi.org/10.5382/econgeo.4970 |
| Media | papier; en ligne; numérique |
| Formats | pdf |
| Province | Yukon |
| SNRC | 115I; 115J; 115K; 115N; 115O; 115P |
| Région | Casino |
| Lat/Long OENS | -142.0000 -136.0000 64.0000 62.0000 |
| Sujets | géochimie des sédiments de cours d'eau; échantillons de sédiment de cours d'eau; minéraux; gisements porphyriques; éléments d'indice; sédimentologie; géochimie |
| Illustrations | tableaux; cartes de localisation; photographies |
| Programme | Initiative géoscientifique ciblée (IGC-5) Systèmes minéralisés intrusions/porphyriques - systèmes porphyriques liés aux arcs - temps et
espace |
| Diffusé | 2023 02 15 |
| Résumé | (disponible en anglais seulement)
Case studies around porphyry Cu deposits in the glaciated regions of the Canadian Cordillera have identified the indicator mineral signatures of these deposits
in till samples and demonstrated that these are useful methods for porphyry Cu exploration. This study applies the same indicator methods to stream sediment samples around the Casino calc-alkaline porphyry Cu-Au-Mo deposit in the unglaciated terrain
of west-central Yukon, Canada. It is one of the largest porphyry Cu-Au-Mo deposits in Canada and is hosted in Late Cretaceous quartz monzonite and associated breccias. Bulk (8-16 kg) coarse-grained stream sediment samples were collected in creeks
around the deposit, nearby porphyry Cu occurrences and background areas. The Casino deposit has an obvious indicator mineral signature in the <2-mm heavy (>3.2-specific gravity [SG]) and mid-density (2.8- to 3.2-SG) fractions of stream sediments that
is detectable at least 18 km downstream and includes gold, chalcopyrite, tourmaline, molybdenite, sphalerite, jarosite, goethite, and pyrite. In contrast, not all of these mineralogically anomalous samples have corresponding anomalous geochemical
signatures in the fine fraction. The porphyry indicator minerals identified in this study are similar to those reported for glaciated terrain with the addition of molybdenite and secondary minerals. Indicator mineral methods provide physical evidence
of nearby mineralization and can be chemically analyzed to provide insights about the nature of the mineralizing system. Government and exploration surveys could benefit from the addition of indicator mineral methods to routine stream sediment
sampling protocols in unglaciated regions of the Yukon and elsewhere globally where porphyry Cu exploration is conducted. |
| Sommaire | (Résumé en langage clair et simple, non publié)
Cet article de revue décrit les résultats de la recherche en géochimie de surface autour du gisement de cuivre Casino au Yukon. Il décrit les
schémas géochimiques des sédiments fluviaux autour de ce grand gisement et formule des recommandations sur les meilleures pratiques d'exploration minérale. |
| GEOSCAN ID | 328556 |
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