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a. A deposit in which minerals of copper, molybdenum, gold, or less
commonly tungsten and tin, are disseminated or occur in a stockwork of
small veinlets within a large mass of hydrothermally altered igneous rock.
The host rock is commonly an intrusive porphyry, but other rocks intruded
by a porphyry can also be hosts for ore minerals.
b. A deposit, usually of copper, molybdenum, or tin, in igneous rock of
any composition that contains larger crystals in a fine-grained
groundmass. SME, 1
Source:
Dictionary of Mining, Mineral, and Related Terms
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