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TitleMineral markers of porphyry copper mineralization: work in progress at the Gibraltar deposit, British Columbia
DownloadDownload (whole publication)
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorPlouffe, AORCID logo; Kobylinski, C H; Hattori, K; Wolfe, L; Ferbey, T
SourceTargeted Geoscience Initiative: 2017 report of activities, volume 1; by Rogers, N (ed.); Geological Survey of Canada, Open File 8358, 2018 p. 57-67, Open Access logo Open Access
PublisherNatural Resources Canada
Documentopen file
Mediaon-line; digital
RelatedThis publication is contained in Targeted Geoscience Initiative: 2017 report of activities, volume 1
File formatpdf
ProvinceBritish Columbia
NTS93B/07; 93B/08; 93B/09; 93B/10
AreaFraser River
Lat/Long WENS-122.5833 -122.0833 52.6667 52.4167
Subjectseconomic geology; surficial geology/geomorphology; tectonics; geochemistry; mineral deposits; mineral exploration; mineral potential; porphyry deposits; copper; molybdenum; ore mineral genesis; mineralization; ore controls; bedrock geology; lithology; igneous rocks; intrusive rocks; diorites; tonalites; trondhjemites; volcanic rocks; mafic volcanic rocks; basalts; volcano-sedimentary strata; sedimentary rocks; conglomerates; clasts; metamorphic rocks; schists; tectonic history; intrusions; oxidation; thermal history; crystallization; foliation; structural features; faults; glacial deposits; tills; rutile; epidote; zircon; cerium; neodymium; antimony; till analyses; heavy mineral samples; mineral occurrences; mass spectrometer analysis; electron probe analyses; electron microscope analyses; Gibraltar Deposit; Granite Mountain Batholith; Chilcotin Group; Gibraltar Mine; Nicola Group; Endako Group; Quesnel Terrane; Ashcroft Formation; Cache Creek Terrane; Cache Creek Complex; Burgess Creek stock; Sheridan stock; Phanerozoic; Cenozoic; Tertiary; Mesozoic; Cretaceous; Jurassic; Triassic; Paleozoic; Permian; Carboniferous
Illustrationslocation maps; geoscientific sketch maps; plots; graphs
ProgramTargeted Geoscience Initiative (TGI-5) Knowledge Management Coordination
ProgramTargeted Geoscience Initiative (TGI-5) Porphyry systems
Released2018 01 19
AbstractIndicator minerals that can persist within glacial sediments offer the potential to be tracers towards buried porphyry mineralization. This study is examining the composition of epidote, rutile and zircon in till and bedrock from the Gibraltar copper-molybdenum porphyry deposit, British Columbia, to test their utility as indicators of mineralizing system fertility. Some rutile grains in till at Gibraltar have a composition comparable to rutile from the El Teniente porphyry copper deposit in Chile. Comparison of the composition of rutile in till and bedrock at Gibraltar is in progress. Other studies have indicated that high Ce/Ce* values in magmatic zircon are indicative of oxidizing conditions that are favourable for the formation of porphyry deposits. At Gibraltar, zircon from the mineralized phase of the intrusion yields high Ce/Ce* values (average of 133) relative to the barren intrusive phases. Epidote is more abundant in till in the region of the host intrusion. Such distribution was originally interpreted to be derived from the propylitic alteration related to porphyry mineralization. Detailed analysis of the epidote shows that epidote in till could be derived from the contact zone between the Granite Mountain batholith and the Nicola volcanic rocks.
Summary(Plain Language Summary, not published)
The Targeted Geoscience Initiative (TGI) is directed towards providing next generation knowledge and methods to facilitate more effective targeting of buried mineral deposits. The program aims to enhance the effectiveness of exploration for Canada¿s major mineral systems by resolving foundational geoscience problems that constrain the geological processes responsible for the liberation metals from their source region, transportation of these ore metals and control their eventual deposition. TGI supports projects on gold, Ni-Cr-PGE, porphyry-style mineralization, uranium and volcanic- and sedimentary-hosted base metal mineralization ore systems, with each project divided into subprojects focused on resolving specific knowledge gaps by integrating data and studies from multiple sites across Canada. Herein, we present interim results and interpretations from a selection of the research activities currently being conducted under the auspices of TGI.

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