- 行业: Mining
- Number of terms: 33118
- Number of blossaries: 0
- Company Profile:
The U.S. Bureau of Mines (USBM) was the primary United States Government agency conducting scientific research and disseminating information on the extraction, processing, use, and conservation of mineral resources.
Founded on May 16, 1910, through the Organic Act (Public Law 179), USBM's missions ...
A layer of a soil that is distinguishable from adjacent layers by characteristic physical properties, such as structure, color, or texture, or by chemical composition, including content of organic matter or degree of acidity or alkalinity. Soil horizons are generally designated by a capital letter, with or without a numerical annotation, e.g. A horizon, A2 horizon.
Industry:Mining
A layer of a soil that is distinguishable from adjacent layers by characteristic physical properties, such as structure, color, or texture, or by chemical composition, including content of organic matter or degree of acidity or alkalinity. Soil horizons are generally designated by a capital letter, with or without a numerical annotation, e.g. A horizon, A2 horizon.
Industry:Mining
A layer of hardened clay lining a fault plane, commonly showing grooves and striae indicating the direction of most recent movement.
Industry:Mining
A layer of hardened clay lining a fault plane, commonly showing grooves and striae indicating the direction of most recent movement.
Industry:Mining
A layer of peat marking a sharp change in the character of the peat and resulting from a profound change in climate.
Industry:Mining
A layer or deposit formed under essentially constant physical conditions, distinguished from other units by differences in grain size and/or fabric, indicating changes in velocity and/or direction of flow.
Industry:Mining
A layer or deposit of soil or rock whose value is sufficient to justify excavation.
Industry:Mining
A layer, stratum, or material immediately beneath some principal surface; specif. a layer of earth or rock that is graded to receive the foundation of an engineering structure. Often it is the soil or natural ground that is prepared and compacted to support, and that lies directly below, a road, pavement, building, airfield, or railway. Compare: subbase
Industry:Mining
A layout consisting of six or more plows, 220 lb (100 kg) each, 20 yd (18.3 m) apart on one rope or chain, feeding onto an armored conveyor; the load on the conveyor is well distributed. A driving unit is arranged at both ends of the face and operated alternately to impart a to-and-fro movement to the plows. The minimum workable seam thickness is 20 in (50.8 cm) at gradients from 0 degrees to 20 degrees ; maximum length of face is about 190 yd (174 m).
Industry:Mining
A lazy miner, specif. one who rests on a tool box while another miner does the work.
Industry:Mining
