On the west side of Needlepoint Mountain, Lower Cambrian Atan Group impure limestone is altered to black magnetite-rich skarn in a zone about 90 metres long adjacent to granitic rocks of the Cassiar Stock.
The skarn is partly banded, with magnetite, chlorite, garnet, diopside, and irregular patches of quartz and fluorite. Danalite, a beryllium-iron silicate of the helvite group, occurs as small grains, clusters, and stringers up to 2 centimetres long. It is accompanied by a few small grains of native bismuth. Overall beryllium content of the occurrence is considerably less than one per cent (McDougall, 1954). Up to 0.038 per cent tin is reported from spectroscopic analysis. Mineralization also includes sphalerite and pyrrhotite.
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Map Reference: 59°8'20"N , 129°46'20"W
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