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Iskut River District - Kerr, Sulphurets, Mitchell Zone, Snowfields, Red Bluff, Brucejack, Snip, Johnny Mountain, Eskay Creek |
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British Columbia, Canada |
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Cu Au Ag
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Super Porphyry Cu and Au
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IOCG Deposits - 70 papers
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The Iskut River district of north-western British Columbia, Canada embraces a number of significant porphyry occurrences, including the Kerr, Eskay Creek, Brucejack, Sulphurets and Red Bluff alkalic porphyry copper-gold and precious metal vein deposits.
Kerr is a deformed porphyry copper-gold deposit hosted by probable upper Triassic to lower Jurassic tuffaceous and sedimentary rocks which are intruded by dykes and stocks comprising pre-mineralisation (plagioclase-augite porphyritic diorite), syn-mineralisation (plagioclase hornblende porphyritic monzonite; syenodiorite; augite porphyry; hornblende porphyry; K feldspar hornblende and plagioclase porphyry) and post-mineralisation (albite, plagioclase, hornblende porphyries and diorites). Reserves have been quoted at: 135 Mt @ 0.76% Cu, 0.34 g/t Au.
Sulphurets which contains several mineralised zones, eg the Mitchell Zone 6 km SE of Kerr with 200 Mt @ 0.2% Cu, 0.86 g/t Au, and the Snowfields gold deposit with 7 Mt @ 2.8 g/t Au. Both are associated with extensive K feldspar, sericite, tourmaline, chlorite, carbonate, pyrite and pyrophyllite alteration systems. The Snowfields disseminated gold is interpretted to represent an epithermal overprint on a porphyry system. The Brucejack precious metal vein deposit in the same vicinity contained 0.75 Mt @ 15.4 g/t Au, 648 g/t Ag.
Red Bluff with 102 Mt @ 0.15% Cu, 0.72 g/t Au is associated with a tonalitic to granodioritic porphyry that intrudes Triassic clastic sediments and has an early K feldspar with quartz, biotite and magnetite alteration phase overprinted by a sericite-quartz-pyrite-albite phase.
The Snip precious metal vein deposit which is associated with a Jurassic intrusion, with reserves of 0.96 Mt @ 28.5 g/t Au is 50 km NW of Kerr. The similar, nearby Johnny Mountain Mine (Stonehouse deposit) contained 0.207 Mt @ 14.1 g/t Au.
The Eskay Creek deposits are also in the Iskut River District (see the separate record on this deposit).
See the Brucejack and Eskay Creek records for more detail of the geology and setting of the district.
For detail consult the reference(s) listed below.
The most recent source geological information used to prepare this decription was dated: 1996.
This description is a summary from published sources, the chief of which are listed below.
© Copyright Porter GeoConsultancy Pty Ltd. Unauthorised copying, reproduction, storage or dissemination prohibited.
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Selected References:
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MacDonald A J, Lewis P D, Thompson J F H, Nadaraju G, Bartsch R D, Bridge D J, Rhys D A, Roth T, Kaip A, Godwin C I, Sinclair A J 1996 - Metallogeny of an early to middle Jurassic arc, Iskut River area, northwestern British Columbia: in Econ. Geol. v91 pp 1098-1114
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Porter GeoConsultancy Pty Ltd (PorterGeo) provides access to this database at no charge. It is largely based on scientific papers and reports in the public domain, and was current when the sources consulted were published. While PorterGeo endeavour to ensure the information was accurate at the time of compilation and subsequent updating, PorterGeo, its employees and servants: i). do not warrant, or make any representation regarding the use, or results of the use of the information contained herein as to its correctness, accuracy, currency, or otherwise; and ii). expressly disclaim all liability or responsibility to any person using the information or conclusions contained herein.
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