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TitleIdentifying new vectors to hidden porphyry-style mineralisation
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorRogers, N; Plouffe, AORCID logo; Chapman, J BORCID logo; McClenaghan, M BORCID logo; Kellett, D AORCID logo; Anderson, R A
SourceTGI 4 - Intrusion Related Mineralisation Project: new vectors to buried porphyry-style mineralisation; by Rogers, N (ed.); Geological Survey of Canada, Open File 7843, 2015 p. 249-291, Open Access logo Open Access
LinksCanadian Database of Geochemical Surveys, downloadable files
LinksBanque de données de levés géochimiques du Canada, fichiers téléchargeables
PublisherNatural Resources Canada
Documentopen file
Mediaon-line; digital
RelatedThis publication is contained in TGI 4 - Intrusion Related Mineralisation Project: new vectors to buried porphyry-style mineralisation
File formatpdf
ProvinceBritish Columbia; New Brunswick; Newfoundland and Labrador; Nova Scotia; Ontario
NTS92I; 92P; 93A; 93B; 21A; 21G; 21H; 1M; 11D; 11E; 11P/13; 11P/14; 11P/15; 11P/16; 32D/01; 32D/02; 32D/07; 32D/08; 21G/14; 21G/15
AreaWilliams Lake; Woodjam; Gibraltar; Highland Valley; Mount Pleasant; Connaigre Peninsula; Mascarene Basin; Caledonian Highlands; Grey River; Moly Brook; Kirkland Lake; Côté Lake; Lake George; Fredericton
Lat/Long WENS -68.0000 -61.5000 46.0000 45.0000
Lat/Long WENS -56.5000 -55.0000 48.0000 47.5000
Lat/Long WENS-124.0000 -120.0000 53.0000 50.0000
Lat/Long WENS -78.4000 -78.4000 48.2833 48.2167
Subjectseconomic geology; surficial geology/geomorphology; metallic minerals; porphyry deposits; porphyry copper; mineral exploration; glacial deposits; tills; till analyses; till geochemistry; drift prospecting; drift deposits; vegetation; ice flow; ice movement directions; biogeochemical surveys; biogeochemistry; dispersal patterns; mineralization; alteration; indicator elements; tungsten; molybdenum; tin; bismuth; bulk samples; mineral deposits; structural interpretations; tectonic models; tectonic environments; tectonic elements; molybdenite; intrusive rocks; granitic rocks; fluid inclusions; quartz; metallogeny; petrographic analyses; granodiorites; petrogenesis; copper; gold; magmatic deposits; hydrothermal alteration; quartz veins; vein deposits; granophile deposits; uranium lead dates; radiometric dates; igneous rocks; Archean; hydrothermal deposits; antimony; magmatism; Gibraltar Mine; Highland Valley Mine; Sisson deposit; Mount Pleasant deposit; Northumberland till; Collins Pond till; Caledonia till; Old Woman Stock; Belleoram Granite; South Mountain Batholith; Evandale Granodiorite; Broad River Group; Woodjam deposit; Upper Beaver gold system; Cote Lake gold system; Lake George deposit; Acadian Orogeny; Devonian; Precambrian; Paleozoic
Illustrationslocation maps; photographs; cross-sections; photomicrographs
ProgramTargeted Geoscience Initiative (TGI-4) Intrusion/Porphyry Ore Systems
Released2015 06 11; 2023 03 17
AbstractIntrusion related (e.g., porphyry) deposits are the most important sources for Cu, Mo, W and Sn, along with Au, Ag, and PGEs. Porphyry deposits are large, low- to medium-grade deposits in which mineralisation is hosted within and immediately surrounding distinctive intrusive phases within larger intrusive complexes that commonly have prolonged emplacement histories. To develop more effective exploration criteria to identify and evaluate deeply buried and/or hidden fertile intrusive mineralizing systems, studies into Cu-Mo/Au and W-Mo-Sn systems are aimed at answering the following questions: i) Are there distinctive proximal and distal footprints for each deposit type that will allow identification of, and vectoring towards hidden economic deposits?; ii) Is there evidence of fertility within the root system of intrusions, i.e. what are the triggering conditions and indicators of an hydrothermal-magmatic system of size and duration sufficient to develop a large porphyry deposit? To help answer these questions studies are being undertaken at sites associated with the Triassic-Jurassic porphyry deposits of the British Columbia interior and for the array of mineralised Canadian Appalachian Siluro-Devonian intrusions, for which the fundamental geoscience knowledge is often lacking.
A common problem facing Cordilleran and Appalachian exploration is how to detect intrusion-related mineralization through the extensive glacial sediment cover. Consequently, research activities are focussing at identifying key geochemical and mineral indicators in till near known mineralization and their detrital dispersal down-ice. Indicators are being developed for the detection of mineralization, but also the alteration halos and vein systems associated with mineralization, which represent much larger exploration targets than the actual economic orebody itself. Once identified in till, these indicators can be traced to their bedrock source using reconstructed ice movement vectors.
Structural relationships indicate that Sn-W-Mo mineralised intrusive systems can form due to extension associated with far removed non-orthogonal accretion. Deposits within these bodies form along fluid pathways such as the intersection of high-angle syntectonic breaks. Mineral potential can also be resolved through trace element fingerprinting. Subtle compositional changes in commonly occurring minerals (i.e., biotite) and fluid inclusions provide evidence of chemical variations related to magma fertility and vectors to mineralisation.
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. This volume summarises research activities completed under the TGI 4 Intrusion Related Mineralisation Project that focused on porphyry-style ore systems related to the Cu- and Cu-Mo deposits of South-Central British Columbia and the Sn-W-Mo-In deposits in New Brunswick, Nova Scotia and Newfoundland.

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