- Industry: 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 ...
An imperfection in a crystal structure characterized by a series of line defects, but not extensive enough to form a grain boundary. Compare: grain boundary; crystal defect.
Industry:Mining
An imperfection in crystal structure characterized by an atomic layer extending part way into a crystal structure. Compare: crystal defect; edge dislocation.
Industry:Mining
An implement for grasping and withdrawing drilling tools when broken, detached, or lost in a borehole. A fishing tool.
Industry:Mining
An implement for grasping and withdrawing drilling tools when broken, detached, or lost in a borehole. A fishing tool.
Industry:Mining
An important component of stranded ropes is the core, which may be either of fiber or of wire. In winding ropes it is generally made of manilla, sisal, or hemp. The function of the core is to support the strands and prevent them from bearing hard against one another. An even more important function is as a store for lubricant for the interior of the rope, and during manufacture it is saturated with lubricant.
Industry:Mining
An important industrial variety of diamond. The stones are spherical masses of minute diamond crystals arranged more or less radially. They have no well-defined cleavage planes and thus have great resistance to abrasion. While the term, ballas, was first applied to such stones from Brazil, diamonds of similar structure known as Cape and African ballas are found. In color, ballas ranges from white to varying shades of black. While Cape and African ballas are not as hard as the Brazilian, they include some fine and unusual stones. Production is small. Rarely, if ever, used for diamond drilling but very valuable for diamond tools.
Industry:Mining
An important iron ore (chiefly hematite) deposit in the Middleback Ranges area of South Australia.
Industry:Mining
An important iron ore deposit in Germany. It consists of conglomerated oolitic limonite and contains about 30% iron.
Industry:Mining
An important source of raw material for silica refractories. A typical analysis is 97.8% SiO<sub>2</sub>, 0.9% Al<sub>2</sub>O<sub>3</sub>, 0.7% Fe<sub>2</sub>O<sub>3</sub>, and 0.4% alkalies.
Industry:Mining
