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TitlePlatinum-group mineralogy of the Giant Mascot Ni-Cu-PGE deposit, Hope, B.C.
AuthorManor, M J; Scoates, J S; Nixon, G T; Ames, D E
SourceBritish Columbia Geological Survey Geological Fieldwork Paper no. 2014-1, 2014 p. 141-156 (Open Access)
LinksOnline - En ligne
Alt SeriesEarth Sciences Sector, Contribution Series 20130343
PublisherBritish Columbia Ministry of Energy and Mines, British Columbia Geological Survey
MeetingMineral Exploration Roundup 2014; Vancouver; CA; January 27-30, 2014
File formatpdf
ProvinceBritish Columbia
Lat/Long WENS-121.5000 -121.0000 49.5000 49.2500
Subjectsmineralogy; economic geology; platinum; nickel; copper; mineralization; mineral occurrences; mineral deposits; igneous rocks; ultramafic rocks; sulphides; plutonic rocks; electron probe analyses; Giant Mascot Ni-Cu-PGE Deposit; platinum group elements
Illustrationslocation maps; photographs; photomicrographs; tables; ternary diagrams; histograms
ProgramTargeted Geoscience Initiative (TGI-4), Mafic-Ultramafic Ore Systems
AbstractThe Giant Mascot Ni-Cu-PGE deposit is British Columbia's only past-producing nickel mine (1958-1974), having yielded ~ 4.2 Mt of ore grading 0.77% Ni and 0.34% Cu with minor Co, Ag and Au. Intrusive ultramafi c rocks (olivine-orthopyroxene ± hornblende ± clinopyroxene cumulates) host the Ni-Cu sulphide mineralization. Field mapping and petrographic study have revealed primary magmatic cumulus textures and minimal alteration of the ultramafi c rocks. Platinum-group minerals (PGM) determined by microbeam techniques are predominantly bismuthotellurides, primarily moncheite [(Pt,Pd)(Te,Bi)2], merenskyite [Pd(Te,Bi)2], and palladian melonite [(Ni,Pd)(Te,Bi)2]. Other precious-metal minerals include sperrylite (PtAs2), hessite (Ag2Te) and altaite (PbTe). Pt-, Pd- and Ni-bismuthotellurides are in or at the margins of base metal sulphides, predominantly pentlandite, or in fractures; precious-metal minerals are mostly along fractures in silicate minerals. Textures are consistent with an orthomagmatic origin for sulphides and PGM involving exsolution from base metal sulphides during cooling. Locally abundant fractures fi lled by chalcopyrite and platinum-rich moncheite are evidence for relatively late-stage mobilization of residual Cu-rich sulphide melts. PGEenriched sulphides containing identifi able PGM and associated precious-metal minerals in the Giant Mascot intrusion indicate that 'orogenic' Ni-Cu mineralization in the Canadian Cordillera and elsewhere may provide signifi cant exploration targets for economic Ni-Cu-PGE deposits.
Summary(Plain Language Summary, not published)
The Targeted Geoscience Initiative (TGI-4) is a collaborative federal geoscience program that provides industry with the next generation of geoscience knowledge and innovative techniques to better detect buried mineral deposits, thereby reducing some of the risks of exploration. The Giant Mascot Ni-Cu-PGE deposit is British Columbia¿s only past-producing nickel mine that operated during 1958-1974. This TGI4 activity reports on the 2012 and 2013 field seasons work and reports on the platinum group minerals (platinum, palladium etc)identified for the first time. The presence of significant identifiable PGM in sulphide ores from Giant Mascot indicates that orogenic Ni-Cu deposits in the Canadian Cordillera and elsewhere , such as the Grenville province and other orogenic belts globally, can be associated with significant PGE mineralization.