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TitreReport on the composition and assemblage of minerals associated with the porphyry Cu-Mo mineralization at the Gibraltar deposit, south central British Columbia, Canada
TéléchargerTéléchargements
AuteurKobylinski, C H; Hattori, K; Smith, S; Plouffe, A
SourceCommission géologique du Canada, Dossier public 8025, 2016, 30 pages, https://doi.org/10.4095/298804
Année2016
ÉditeurRessources naturelles Canada
Documentdossier public
Lang.anglais
DOIhttps://doi.org/10.4095/298804
Mediaen ligne; numérique
Formatspdf
ProvinceColombie-Britannique
SNRC93B/07; 93B/08; 93B/09; 93B/10
Lat/Long OENS-122.5833 -122.0833 52.6667 52.4167
Sujetsminéralisation; cuivre; gisements porphyriques; or; molybdène; gîtes minéralogiques; tills; altération; altération hydrothermale; minéralogie; géologie économique; Cénozoïque; Quaternaire
Illustrationslocation maps; photographs; photomicrographs; tables; plots
ProgrammeÉtude des gîtes porphyriques, Initiative géoscientifique ciblée (IGC-4)
Diffusé2016 06 29
Résumé(disponible en anglais seulement)
Glacial sediments commonly contain resistate heavy minerals, such as zircon, rutile and epidote. To identify the sources of these minerals and use them as a vectoring tool for mineral deposits, it is critical to understand the compositional variations and assemblages of these minerals in mineral deposits and whether they are distinct from those in barren rocks. This paper reports the occurrence and assemblages of igneous and alteration minerals in the Gibraltar porphyry Cu deposit, southcentral British Columbia. The Gibraltar deposit is the largest of three porphyry-Cu deposits in the region, the others being the Mount Polley mine and the Woodjam prospect. The Gibraltar deposit is hosted by the Granite Mountain batholith and has reserves of over 749 million tons at 0.249% Cu and 0.008% Mo. The batholith is mostly tonalite, with minor variation in modal abundances of felsic and mafic minerals. Igneous minerals are plagioclase, quartz, biotite, hornblende, titanite, zircon and apatite. The mineralization is accompanied by extensive phyllic alteration in the tonalite, which produced illite, quartz, rutile, titanite, magnetite, apatite, chlorite and epidote. Hydrothermal titanite is distinctly different from igneous titanite in crystal habits, optical properties and chemical compositions. Epidote shows a large compositional variation even within one sample from Al-rich (high clinozoisite component) to Fe-rich epidote. Some epidote grains contain significant La and Ce (allanite component), which could be diagnostic of the porphyry mineralization. Preliminary observations suggest the presence of a potassic alteration zone forming hydrothermal biotite, but is now replaced by chlorite.
Résumé(Résumé en langage clair et simple, non publié)
La composition de minéraux spécifiques de la roche en place a été determinée dans le but d'identifier les mêmes minéraux avec la même composition dans les sédiments glaciaires. En d'autres mots, certains minéraux dans les sediments ayant une composition spécifique peuvent être reliés à une source précise dans la roche en place. Les résultats de ces travaux ont une implication directe pour la prospection minérale.
GEOSCAN ID298804