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TitleControls on indium mineralisation in tin-tungsten-base metal deposits of the Canadian Appalachians
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AuthorGoeddeke, C R; Chapman, J B; Samson, I M
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. 101-110, https://doi.org/10.4095/296468 (Open Access)
LinksCanadian Database of Geochemical Surveys, downloadable files
LinksBanque de données de levés géochimiques du Canada, fichiers téléchargeables
Year2015
PublisherNatural Resources Canada
Documentopen file
Lang.English
Mediaon-line; digital
RelatedThis publication is contained in Rogers, N; (2015). TGI 4 - Intrusion Related Mineralisation Project: new vectors to buried porphyry-style mineralisation, Geological Survey of Canada, Open File 7843
File formatpdf
ProvinceNew Brunswick; Nova Scotia
NTS21A; 21H; 21G
AreaMount Pleasant; Appalachians
Lat/Long WENS -68.0000 -64.0000 46.0000 44.0000
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; metallic minerals; geochemistry; mineralogy; porphyry deposits; porphyry copper; mineral exploration; mineralization; alteration; tungsten; molybdenum; tin; bismuth; bulk samples; mineral deposits; structural interpretations; molybdenite; intrusive rocks; granitic rocks; petrogenesis; copper; gold; igneous rocks; indium; Sisson deposit; Mount Pleasant deposit; South Mountain Batholith
Illustrationslocation maps; photographs; photomicrographs; cross-sections; ternary diagrams
ProgramIntrusion/Porphyry Ore Systems, Targeted Geoscience Initiative (TGI-4)
Released2015 06 11
AbstractIndium is a minor but potentially economically significant component of the ore metal tenor of many porphyry-style, stockwork and polymetallic vein-type Sn-W and Sn-base metal deposits of the Canadian Appalachians. However, indium distribution between deposits is highly uneven, and whereas some deposits contain hundreds of kilograms of the metal at grades sufficient to justify recovery, others are near-barren. In order to investigate the fundamental temperature, mineralogical, spatial and chemical controls on indium mineralisation in the district, this study has taken samples from indium rich and poor occurrences at 10 drilled prospects in southern New Brunswick and southwest Nova Scotia, as well as from the past-producing East Kemptville Mine in Nova Scotia.
Detailed mineralogical characterization of these materials has shown that, contrary to existing models, within this district indium is commonly introduced early in the deposit paragenesis, presumably as a component of the initial, high-temperature magmatic-hydrothermal fluids. During this phase of mineralisation, indium is dominantly precipitated within copper-rich sphalerite, and it is the distribution of this mineral phase that primarily governs the presence or absence of indium within a mineralised body. During later cooling of the deposit a proportion of the indium is exsolved from sphalerite during recrystallization, and forms lamellae of a sulphide mineral that resembles sakuraiite in the core zones of many individual sphalerite.
GEOSCAN ID296468