- 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 ...
Three borides are known: UBr<sub>2</sub>, UBr<sub>3</sub>, and UBr<sub>4</sub>. The most attention has been paid to the tetraboride, the properties of which are: melting point, >2,100 degrees C (but oxidizes rapidly above 600 degrees C); sp gr# = 9.38 g/mL; thermal expansion, 7.1 X 10<sub>- 6</sub>(20 to 1,000 degrees C); modulus of rupture (20 degrees C), 60,000 psi (414 MPa); electrical resistivity, 3 X 10<sub>-5</sub>ohm.cm.
Industry:Mining
Three or more geologic sections showing the relationship of wells to subsurface formations. The scales diminish with distance from the foreground to give proper perspective. When several sections are used together, they form a fencelike enclosure, hence the name. Similar in some respect to a block diagram, but it has the advantage of transparency, which is not possible in a block diagram.
Industry:Mining
Three sheaves over which a rope is passed so as to take a course somewhat like that of the letter M. The resulting friction causes the rope to slide with difficulty. It is used for lowering loaded cars from the face to the mouth of a room on a steep roadway.
Industry:Mining
Three standard lengths of drill rod or drill pipe connected together and handled and stacked in a drill tripod or derrick as a unit length of rod on borehole round trips. Also incorrectly spelled thribble; thrible; tribble; trible.
Industry:Mining
Three thorium nitrides have been reported: ThN, Th<sub>2</sub>N<sub>3</sub>, and Th<sub>3</sub>N<sub>4</sub>.
Industry:Mining
Three thorium sulfides have been reported: Th<sub>4</sub>S<sub>7</sub>, Th<sub>2</sub>S<sub>3</sub>, and ThS . Crucibles made of these sulfides have been used as containers for molten cerium.
Industry:Mining
Three types of face belt joints are used: (1) hinged-plate type, which is attached to the belt by means of copper rivets and interconnected by means of pins; (2) wire-hook joints, the most popular type--the hooks are inserted by means of a hand-operated machine and are connected by a flexible steel pin; and (3) spliced joint, in which a portion on each side of the belt is cut away so as to provide a splice, and this is secured by cramped-type pins, which are inserted and knocked over by hand.
Industry:Mining
Thrusting a pointed steel rod down through sand or soft clays to contact a seam or orebody. The point of the rod is examined for traces of coal or mineral.
Industry:Mining
Ti<sub>5</sub>Si<sub>3</sub>; sp gr, 4.2. This special ceramic has good resistance to high temperature oxidation, but not to thermal shock.
Industry:Mining
Tidal channel in which the ebb currents are stronger than the flood currents.
Industry:Mining
