Extract from MINFILE Occurrences: 104P 071 and 104P 079
Development status: Prospect
Name: KUHN, WINDY, BALSAM and DEAD GOAT, BALSAM, WINDY
Approximately 4 kilometres northwest of the Cassiar Asbestos Mine, clastic and carbonate metasediments of the Lower Cambrian Atan Group and Hadrynian Ingenika Group, on the east-dipping western limb of the McDame synclinorium, are intruded by the Late Cretaceous Kuhn stocks. Massive calc-silicate skarn occurs as semi-continuous layers up to 10 metres thick along the western or lower contacts of marble layers and as smaller lenses and pods. The skarn layers dip 38 de- grees east. Scheelite, molybdenite, pyrite, pyrrhotite and rare mag- netite form coarse disseminations interstitial to calc-silicates. Locally, quartz-molybdenite veins crosscut Atan calc-silicate horn- fels. Layered magnetite skarn, up to 1 metre wide, with finely dis- seminated molybdoscheelite, occurs in zones bordering massive calc- silicate skarn. Retrograde massive pyrrhotite or pyrrhotite- sphalerite rich skarn occurs as pods and veins replacing other skarn facies. These contain disseminated scheelite and chalcopyrite. Locally stibnite and sphalerite veins crosscut Atan dolomite. The skarn mineral assemblage includes garnet, diopside, actinolite, powellite and fluorite.
Combined reserves at Kuhn North are 409,300 tonnes grading 0.08 per cent molybdenum and 0.38 per cent tungsten; additional 78,700 tonnes grading 0.50 per cent Wo3 (or 0.39 per cent W); grades given were 0.134 per cent MoS2 and 0.48 per cent Wo3; conversion factors used were 1.6681 for Mo and 1.2611 for W. The dimensions of the deposit are 215 by 130 by 6 metres (Assessment Report 10512).
The Dead Goat skarn is approximately 4.0 kilometres northwest of the Cassiar asbestos deposit. Garnet-diopside-actinolite skarn is developed in steeply east-dipping marble of the Hadrynian Ingenika Group near its contact with quartz monzonite of the Late Cretaceous Cassiar Stock.
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