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Mount Pleasant: granite
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Mount Pleasant: granite. Devonian. Mount Pleasant, New Brunswick. Collector: M. McLeod. New Brunswick Museum (NBME 1068). Image width 21 cm. The Mount Pleasant mineral deposit began its history near the end of the Devonian Period. Magma exploded at the surface to form a broad volcanic cone, while below the surface the melt cooled to create granitic rocks. The chemistry of the magma caused the granites to be enriched in tungsten, molybdenum, tin and other metals. The granite below the orebody is cut by stockwork veining, minor molybdenite mineralization.
