5 Terms
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Mineral mining
The extraction of valuable minerals or other geological materials from the earth for economic interests.
Industry: Mining
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Mineral mining
Brown clay
Mining; General mining
A brown to red deep-sea deposit, which usually contains manganese nodules or a film of manganese. It is the finest divided clay suspension that is derived from the land and transported by ocean ...
Red clay
Mining; General mining
A brown to red deep-sea deposit, which usually contains manganese nodules or a film of manganese. It is the finest divided clay suspension that is derived from the land and transported by ocean ...
Argillaceous hematite
Mining; General mining
A brown to deep-red variety of natural ferric oxide containing an appreciable portion of clay (or sand).
Ironstone clay
Mining; General mining
A brown to deep-red variety of natural ferric oxide containing an appreciable portion of clay (or sand).
Ruin agate
Mining; General mining
A brown variety of agate displaying on polished surfaces markings that resemble the outlines of ruined buildings.
Rosthornite
Mining; General mining
A brown to garnet-red resinous material forming lenticular masses in the coal of Carusthia.
Dysluite
Mining; General mining
A brown variety of gahnite containing manganese and iron in Massachusetts and New Jersey.
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