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East Kemptville |
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Nova Scotia, Canada |
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Sn Cu Zn Ag
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Super Porphyry Cu and Au
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The East Kemptville greisen tin deposit is located in south-western Nova Scotia Canada, some 25 km north-east of the town of Yarmouth (#Location: 44° 6' 11"N, 65° 40' 55"W).
During its period of operation from 1985 to 1992 it was the only primary tin mine in North America and one of the largest in the world.
The deposit is located within the 300 x 60 km South Mountain Batholith which covers much of the southern half of Nova Scotia. The Davis Lake Pluton, principally a biotite monzogranite, lies within this larger batholith near its south-western tip. The tin mineralization at East Kemptville occurs within an apophysy of this pluton into quartzites belonging to the Goldenville Formation of the Cambro-Ordovician Meguma Group. The deposit comprises a 1500 x 500 m zone of sericitised and greisenised leucogranite composed principally of quartz, topaz and muscovite with associated sulphides.
In detail, the greisen contains quartz, pyrite, plagioclase (albite), pyrrhotite, orthoclase, sphalerite, muscovite, fluorite, topaz, chalcopyrite, cassiterite and arsenopyrite, with lesser galena, beryl, triplite, molybdenite, vivianite, marcasite, wolframite, dickite, calcite, stilbite, dolomite, fluorapatite, rhodocrosite, siderite and apatite.
The deposit was stated to have contained 56 Mt of ore, although before closure due to low tin prices, it produced 18.8 Mt of ore (from a total of 26.7 Mt tonnes of waste+ore) at a head grade of 0.18% Sn to yield 21 331 tonnes of contained tin, 1582 tonnes of contained copper, 2009 tonnes of contained zinc and 2.139 tonnes of contained silver, all in concentrates.
Remaining NI 43-101 compliant mineral resources as at October 2014, at a 0.1% Sn cutoff were: (Avalon Rare Metals, Inc.):
Indicated resource - 18.47 Mt @ 0.176% Sn, 0.173% Zn, 0.064% Cu;
Inferred resource - 16.95 Mt @ 0.148% Sn, 0.122% Zn, 0.062% Cu.
For detail consult the reference(s) listed below.
The most recent source geological information used to prepare this decription was dated: 1997.
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.
East Kemptville
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Selected References:
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Halter W E, Williams-Jones A E 1998 - Origin and evolution of the Greisenizing fluid at the East Kemptville Tin deposit, Nova Scotia, Canada: in Econ. Geol. v93 pp 1026-1051
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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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