| Title | Identifying new vectors to hidden porphyry-style mineralisation |
| Download | Downloads |
| |
| Licence | Please note the adoption of the Open Government Licence - Canada
supersedes any previous licences. |
| Author | Rogers, N; Plouffe, A ; Chapman, J B; McClenaghan, M B; Kellett, D A; Anderson, R A |
| Source | TGI 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, https://doi.org/10.4095/296471  Open Access |
| Links | Canadian Database of Geochemical Surveys, downloadable
files
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| Links | Banque de données de levés géochimiques du Canada,
fichiers téléchargeables
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| Image |  |
| Year | 2015 |
| Publisher | Natural Resources Canada |
| Document | open file |
| Lang. | English |
| Media | on-line; digital |
| Related | This publication is contained in TGI 4 - Intrusion Related
Mineralisation Project: new vectors to buried porphyry-style mineralisation |
| File format | pdf |
| Province | British Columbia; New Brunswick; Newfoundland and Labrador; Nova Scotia; Ontario |
| NTS | 92I; 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 |
| Area | Williams 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 |
| Subjects | economic 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 |
| Illustrations | location maps; photographs; cross-sections; photomicrographs |
| Program | Targeted Geoscience Initiative (TGI-4) Intrusion/Porphyry Ore Systems |
| Released | 2015 06 11; 2023 03 17 |
| Abstract | Intrusion 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. |
| GEOSCAN ID | 296471 |
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