Database name: |
World Fe-oxide+/-Cu-Au-U (IOCG) deposits |
Compilers: |
Sunil S. Gandhi |
Release date: |
2015-03-03 |
|
|
Deposit group name(s): |
Texada Mines; Texada Island Iron Deposits |
Political location(s): |
Canada; Province or state: British Columbia; Nearest community: Vancouver (115 km NW) |
NTS map data: |
092F10 (Comox) |
Deposit clan (type): |
Iron Skarn-type |
Deposit (sub) types: |
barren skarns grade into magnetite-rich zones outward from intrusive contact and then into marble; contact with unaltered rocks sharp; younger veinlets of magnetite and pyrite-chalcopyrite common; Reference: Sangster, D. F., 1969: The Contact Metasomatic Magnetite deposits of Southwestern British Columbia; Bulletin, Geological Survey of Canada, Geological Survey of Canada, Department of Energy, Mines and Resources, Ottawa, Canada, Publication code 172, 85 p., 9 maps. minor iron skarns occur 5 km to the NNE, on NE shore of Texada Isalnd, near Imperial Limestone quarry and at Raven Bay showings; they contain magnetite, chalcopyrite and erythrite (up to 0.17 % Co); Reference: Webster, I. C. L..; Ray, G. E., 1990: Geology and Mineral Deposits of Northern Texada Island (92F/9, 10 and 15); Section Mineral Deposit Studies, in Geological Fieldwork 1989: A Summary of Field Activities and Current Research, Edited by Anonymous, Paper, Geological Survey Branch, Mineral Resources Division, British Columbia Ministry of Energy, Mines and Petroleum Resources, Province of British Columbia, Canada, 1990-1, 535 p, p. 257 - 265 |
Deposit group status: |
past producer; Size category: 20 Mt; Status comments: mined 1953-1976; open pits on 4 main deposits in a 2 x 0.5 km zone; from W to E: Prescott, Yellow Kid, Paxton and Lake; underground workings to deeper levels, and to Le Roi, Midway and Lake Extention past producer; Size category: 20 Mt; Status comments: Yellow Kid and nearby Le Roi and Midway deposits produced 18 Mt; average grade 60-65 % Fe; some Cu, Au and Ag from a small tonnage mined in northern part of the Lake deposit during from 1901 to 1921 |
Geologic province: |
Cordilleran Orogen |
Geologic subprovince: |
Insular Belt |
Geologic district: |
Wrangell Terrane |
Deposit object located: |
main deposit of the group |
Commodities: |
Fe; Cu; Au; Ag |
Geological ages: |
Late Triassic - Early Jurassic (host rocks) Early Jurassic - Middle Jurassic (mineralization) |
Tectonic setting: |
continental marginal arc-fold belt; transpressive; Formal name: Bonanza magmatic arc (mineralization) |
Coincident features: |
intrusive contact (ore bodies at or near the north contact of Gillies stock with previously folded andesites and limestone); Coincident feature name: Gillies Intrusion/Stock fold hinges (some of the Fe skarn bodies localized at hinge zones of open to tight folds in host strata near intrusive contact); Coincident feature name: Karmutsen andesites-Quatsino limestone |
Regional tectonic structure: |
northwest-trending open folds (early Jurassic to late Cretaceous; limestone and underlying volcanics folded into north plunging folds) Tectonic structure name: Coast Range orogeny |
Host rocks: |
(1) volcanic; mafic-intermediate volcanic rocks (basaltic to andesitic flows); Magma series/sedimentary package/metamorphic group: calc-alkaline; Depositional setting: shallow marine; Metamorphic grade: greenschistExternal host rock forms: | flows, tuffs and agglomerate | Host rock protoliths: | basalt-andesite (flows, some pillowed; folded and altered near the desposit); Host rock protolith name: Karmutsen Group | Internal host rock structures: | massive to porphyritic | Individual lithologies: | basalt-andesitic basalt (faint bedding in tuffaceous beds; clouding of plagioclase and growth of actinolite in hornblende) | Host rock stratigraphy: | Karmutsen Group |
(2) sedimentary; carbonate (limestone completely recrystallized to medium grained marble); Metamorphic grade: greenschistExternal host rock forms: | well bedded | Host rock protoliths: | carbonate (conformably overlies mafic flows of the Karmutsen Group that forms lower part of the Vancouver Group); Host rock protolith name: Quatsino Formation of Vancouver Group | Internal host rock structures: | white and grey beds; some thin dark grey beds | Individual lithologies: | marble (medium grained; folded, recrystallized and intruded by quartz monzonitic Gillies stock) | Host rock stratigraphy: | Quatsino/Marble Bay Formation |
(3) intrusive; quartz monzonite-monzogabbro suite (magnetite deposits genetically related to the intrusion); Magma series/sedimentary package/metamorphic group: calc-alkaline; Depositional setting: hypabyssal; Metamorphic grade: unmetamorphosedExternal host rock forms: | crystalline, coarse; grey | Host rock protoliths: | quartz monzonite (older phase massive grey, younger phase massive to porphyritic, and the youngest aplitic dykes); Host rock protolith name: Gillies Intrusion/Stock | Internal host rock structures: | massive, equigranular; rare phenocrysts | Individual lithologies: | quartz monzonite (modal composition: plagioclase (An47) 29 %, K-feldspar 14 %, quartz 16 %, augite 8 %, biotite 19 %, opacite 5 %, and accesories 10 %) | Host rock stratigraphy: | Gillies Intrusion/Stock |
|
Host rock name(s): |
Karmutsen Group; Quatsino/Marble Bay Formation; Gillies Intrusion/Stock |
Related igneous rocks: |
(1) intrusive; gabbro-diorite suite (post-ore dykes, up to 15 m wide); Initials: Feldspar Porphyry dykes; Magma series: calc-alkaline; Depositional setting: hypabyssalIndividual lithologies: | porphyritic diorite (phenocrysts of plagioclase, 15 -20 %, and pyroxene, 2 %, in groundmass of plagioclase, hornblende, apatite, sericite and epidote) |
|
Metallogenic signatures: |
Fe Fe-Cu Fe-Cu-Au-Ag |
Alteration signatures: |
skarnification: garnet-diopside; What was altered: andesites, limestone and quartz monzonite |
Mineralogy: |
(alteration): garnet, diopside-hedenbergite, actinolite, epidote (gangue): calcite (mineralization): magnetite, pyrite, chalcopyrite, pyrrhotite, arsenopyrite, sphalerite |
Radiometric ages: |
Object dated: Host Rocks(3); Age - Ma: 176; +2; -2; Dating method: U-Pb; Concentrate: zircon; Source rock: qurtz monzodiorite; Formal name: Gillies Intrusion; Event dated: intrusive event; Interpretive comment: age marks time of formation of Fe skarns at contact of the intrusion with limestone and volcanics; Reference: Ettlinger, A. D.; Ray, G. E., 1990: Precious Metal Enriched Skarns in British Columbia: An Overview and Geological Study; Paper, Geological Survey Branch, Mineral Resources Division, British Columbia Ministry of Energy, Mines and Petroleum Resources, Province of British Columbia, Canada, Publication code 1989-3, 128 p., 1 maps. |
Deposit group shape: |
zones of lensoid and irregular bodiesDeposit group dimensions: | length: 2 kilometres width: 0.5 kilometres depth: 0.3 kilometres |
|
References: |
British Columbia Mines and Energy, 2001 |
British Columbia MINFILE Database |
Government of British Columbia, MINFILE Mineral Inventory, Internet |
Carson, D. J. T.; Muller, J. E.; Wanless, R. K.; Stevens, R. D., 1971 |
Age of the Contact Metasomatic Copper and Iron Deposits, Vancouver and Texada Islands, British Columbia |
Paper, Geological Survey of Canada, Geological Survey of Canada, Department of Energy, Mines and Resources, Ottawa, Canada, Publication code 71-36, 9 p. |
Ettlinger, A. D.; Ray, G. E., 1990 |
Precious Metal Enriched Skarns in British Columbia: An Overview and Geological Study |
Paper, Geological Survey Branch, Mineral Resources Division, British Columbia Ministry of Energy, Mines and Petroleum Resources, Province of British Columbia, Canada, Publication code 1989-3, 128 p., 1 maps. |
Ray, G. E.; Ettlinger, A. D.; Meinert, L. D., 1990 |
Gold Skarns: Their Distribution, Characteristics and Problems in Classification |
Section Mineral Deposit Studies, in Geological Fieldwork 1989: A Summary of Field Activities and Current Research, Edited by Anonymous, Paper, Geological Survey Branch, Mineral Resources Division, British Columbia Ministry of Energy, Mines and Petroleum Resources, Province of British Columbia, Canada, 1990-1, 535 p, p. 237 - 246 |
Sangster, D. F., 1969 |
The Contact Metasomatic Magnetite deposits of Southwestern British Columbia |
Bulletin, Geological Survey of Canada, Geological Survey of Canada, Department of Energy, Mines and Resources, Ottawa, Canada, Publication code 172, 85 p., 9 maps. |
Webster, I. C. L..; Ray, G. E., 1990 |
Geology and Mineral Deposits of Northern Texada Island (92F/9, 10 and 15) |
Section Mineral Deposit Studies, in Geological Fieldwork 1989: A Summary of Field Activities and Current Research, Edited by Anonymous, Paper, Geological Survey Branch, Mineral Resources Division, British Columbia Ministry of Energy, Mines and Petroleum Resources, Province of British Columbia, Canada, 1990-1, 535 p, p. 257 - 265 |
|
Associated deposit(s): |
Prescott (772), Yellow Kid (773), Paxton (774), Lake (775) |