- 行业: Mining
- Number of terms: 33118
- Number of blossaries: 0
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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 general term for the property possessed by some rocks of splitting easily into thin layers along closely spaced, roughly planar, and approx. parallel surfaces, such as bedding planes in shale or cleavage planes in schist; its presence distinguishes shale from mudstone. The term includes such phenomena as "bedding fissility" and "fracture cleavage." Etymol. Latin fissilis, that which can be cleft or split. Adj. fissile.
Industry:Mining
A general term for the rock in which a secondary or transported ore deposit originated; mother lode.
Industry:Mining
A general term for the science dealing with the description and systematical classification of rocks, based on observations in the field, on hand specimens, and on thin sections. Petrography is thus wider in its scope than lithology, but more restricted than petrology, which implies interpretation as well as description.
Industry:Mining
A general term for the setting of bars of timber for supporting underground roadways or shafts.
Industry:Mining
A general term for the study of the structure and mechanism of emplacement of salt domes and other salt-controlled structures.
Industry:Mining
A general term for the study of the structure and mechanism of emplacement of salt domes and other salt-controlled structures.
Industry:Mining
A general term for the study, by all available methods, of the natural history of rocks, including their origins, present conditions, alterations, and decay. Petrology comprises petrography on the one hand, and petrogenesis on the other, and properly considered, its subject matter includes ore deposits and mineral deposits in general, as well as rocks in the more limited sense in which that term is generally understood.
Industry:Mining
A general term for the sulfide ores, adopted into English from the original German.
Industry:Mining
A general term for the texture of any mineral aggregate or intergrowth formed by exsolution. It is generally fairly homogeneous, ranging from perthitic to geometrically regular.
Industry:Mining
A general term for those types of refractory material that contain a high proportion of silica; e.g., silica refractories (greater than 92% SiO<sub>2</sub>) and siliceous refractories (78% to 92% SiO<sub>2</sub>). The name derives from the fact that silica behaves chemically as an acid and at high temperatures reacts with bases such as lime or alkalies.
Industry:Mining
