basemetals

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basemetals — n. any metal which is not a precious metal (tin, lead, copper, etc.); metallic element in an alloy; metal which is cut … English contemporary dictionary
Porphyry copper deposit — Porphyry copper deposits are copper orebodies which are associated with porphyritic intrusive rocks and the fluids that accompany them during the transition and cooling from magma to rock. Circulating surface water or underground fluids may… … Wikipedia
Tin — is a chemical element with the symbol Sn ( la. stannum) and atomic number 50. This silvery, malleable poor metal that is not easily oxidized in air and resists corrosion, is found in many alloys and is used to coat other metals to prevent… … Wikipedia

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