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TitleTGI 4 intrusion related mineralisation project: developing new ways to detect hidden deposits
AuthorRogers, N; McClenaghan, B; McClenaghan, S; Chapman, J; Kellett, D; Parkhill, M; Thorne, K; Lentz, D; Plouffe, A; Anderson, B
SourceAbstracts 2012: Exploration, Mining and Petroleum New BrunswickF; by Keith, E A (ed.); 2012 p. 23
LinksOnline - En ligne
Alt SeriesEarth Sciences Sector, Contribution Series 20120498
MeetingExploration, Mining and Petroleum New Brunswick; Fredericton; CA; November 2012
Mediaon-line; digital; paper
File formatpdf
Subjectsstructural geology; porphyry deposits; mineral deposits; tungsten; molybdenum; tin; mineralization; structural interpretations; analytical methods; Triassic; Jurassic
ProgramTargeted Geoscience Initiative (TGI-4), Intrusion/Porphyry Ore Systems
AbstractTargeted Geoscience Initiative 4 (TGI 4) is a 5 year Government of Canada program to conduct thematic, knowledge-driven ore systems studies aimed at discovering future resources through more effective targeting of buried mineral deposits.
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 mineralization is hosted within and immediately surrounding distinctive intrusive phases within larger intrusive complexes that commonly have a complicated and prolonged emplacement history. The metallogenic contents of intrusion related deposits are diverse, reflecting a variety of tectonic settings.
The purpose of this project is to develop more effective exploration criteria to identify and evaluate fertile intrusive mineralizing systems at depth and/or that are hidden beneath surficial deposits. In order to achieve this, studies are being undertaken at sites associated with the Triassic-Jurassic porphyry deposits of the British Columbia interior and the array of mineralized Canadian Appalachian Siluro-Devonian intrusions, for which the fundamental geoscience knowledge is often lacking.
The alteration halos and vein systems associated with intrusion related mineralization can represent a much larger exploration target than the actual economic orebody itself. In the right circumstances alteration and other vectors can be applied to identify hidden deposits. A common problem facing Appalachian exploration is how to detect mineralized sequences through the extensive surficial coverage. Indicator mineral dispersal is well established for diamond exploration, but has the potential to be applied to other mineralizing systems within glaciated terrains. Test cases for the applicability and cost effectiveness of indicator mineral exploration are being conducted in the Sisson Brook and Mount Pleasant deposit areas. Furthermore, it might be possible to resolve the potential ore system fertility of intrusions through mineral trace element fingerprinting of common phases and fluid inclusions utilising techniques such as in situ laser ablation ICP-MS analysis. Several graduate studies have been instigated to investigate these methods at sites across New Brunswick.