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TitleTGI-4 intrusion related mineralization project: identifying new vectors to hidden mineralization
AuthorRogers, N; Anderson, B; Plouffe, A; Kellett, D; McClenaghan, B; Chapman, J
SourceGeological Association of Canada - Newfoundland & Labrador Brach Spring Technical Meeting; 2013.
LinksOnline - En ligne
Alt SeriesEarth Sciences Sector, Contribution Series 20120497
MeetingNewfoundland & Labrador Brach Spring Technical Meeting; St John's; CA; February 18-20, 2013
Mediapaper; digital; on-line
File formathtml
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
AbstractThe Targeted 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 represent the world's most important sources for Cu, Mo, W and Sn, along with Au, Ag, and PGEs. Porphyry deposits are typically 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 a complex 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 BC interior and for the array of mineralised 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 mineralised sequences through the extensive surficial cover. Indicator-mineral dispersal is a well established method for diamond exploration, but has it the potential to be applied to other mineralising 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 in New Brunswick. Additional studies are examining whether regional structural controls influence the loci of mineralising centres and thus can be utilised as a vector to hidden high prospectivity zones.