. [Reports]. myown discussion. (1) Original Separation is applied to the process by which themetallic minerals are separated during the solidification of a mag-ma. Minerals thus formed are known as Original. (2) Contemporaneous Precipitation, is applied to the processby which the metallic minerals are deposited at the same time asthe sediments of which the enclosing rock is composed. Mineralsthus formed are known as Contemporaneous minerals. (3) Concentration is applied to the process by which metallicminerals are brought together from extraneous sources,—original,contemporaneous, concentrated
. [Reports]. myown discussion. (1) Original Separation is applied to the process by which themetallic minerals are separated during the solidification of a mag-ma. Minerals thus formed are known as Original. (2) Contemporaneous Precipitation, is applied to the processby which the metallic minerals are deposited at the same time asthe sediments of which the enclosing rock is composed. Mineralsthus formed are known as Contemporaneous minerals. (3) Concentration is applied to the process by which metallicminerals are brought together from extraneous sources,—original,contemporaneous, concentrated or enriched. Bodies so formed areknown as Concentration deposits. (4) Enrichment is applied to the processes by which oneportion of a deposit may be enriched at the expense of anotherpart, or through the abstraction of associated minerals. Suchbodies may be known as Enrichment deposits. (A) Descensional Ores are those that have been tranoferredfrom higher to lower altitudes. During their transfer they may.
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