- Industri: 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 sedimentary rock composed primarily of material formed directly by precipitation from solution or colloidal suspension (such as by evaporation) or by the deposition of insoluble precipitates (such as by mixing solutions of two soluble salts); e.g., gypsum, rock salt, chert, or tufa. It generally has a crystalline texture. Compare: detrital rock
Industry:Mining
A sedimentary rock consisting of slightly waterworn, heterogeneous fragments of all sizes, deposited in an alluvial fan and later cemented into a firm rock; it is characterized by persistence parallel to the depositional strike and by rapid thinning downdip.
Industry:Mining
A sedimentary rock of ore grade; an ore deposit formed by sedimentary processes, e.g., saline residues, phosphatic deposits, or iron ore of the Clinton ore type.
Industry:Mining
A sedimentary rock with a high enough content of phosphate minerals to be of economic interest. Most commonly it is a bedded primary or reworked secondary marine rock composed of microcrystalline carbonate fluorapatite in the form of laminae; pellets; oolites; nodules; skeletal, shell, and bone fragments; and guano. Aluminum and iron phosphate minerals (wavellite, millisite) are usually of secondary formation.
Industry:Mining
A sedimentary texture of certain calcareous rocks, characterized by uniform particles of clay size and by an extremely smooth appearance resembling that of the stone used in lithography.
Industry:Mining
A sedimentation apparatus for determining particle size, based upon the settling of powder through a long sedimentation tube filled with liquid. The instrument consists of the sedimentation tube, a smaller reservoir at the top joined to the tube through a large bore stopcock, and a calibrated capillary mounted concentrically at the bottom of the tube.
Industry:Mining
A seismic disturbance that is due to the direct action of volcanic force, or one whose origin lies under or near a volcano, whether active, dormant, or extinct.
Industry:Mining
A seismic method of shooting in which seismometer stations are placed uniformly along the length of a line and shot from holes also spaced along the line so that each hole records seismic-ray paths identical geometrically with those from immediately adjacent holes, so that events may be carried continuously by equal-time comparisons. Compare: correlation shooting
Industry:Mining
A seismic prospecting technique in which a special recording system yields readable reflections from layers less than 10 ft (3 m) thick at depths as little as 100 ft (30 m).
Industry:Mining
