- 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 ...
Gem minerals, esp. crystals, rounded by action of water rolling them against rocks or gravels in beds of rivers, lakes, or the ocean.
Industry:Mining
Gems, particularly diamonds, of the highest value, irrespective of size. In diamonds, the term applies to stones that are flawless, without color or almost bluish white. A slight amount of color detracts from the value, and the stones are said to be off color.
Industry:Mining
General work performed behind the working faces, as opposed to work done at the faces. This is commonly referred to as "outby work."
Industry:Mining
Generalizations about coordination polyhedra and the ways they fit together in stable ionic crystal structures: (1) A coordination polyhedron of anions forms about each cation. (2) Electronic neutrality is maintained over short atomic distances. (3) Coordination polyhedra tend not to share edges or faces. (4) Highly charged cations minimize sharing of polyhedral elements.
Industry:Mining
Generally 500 to 3,000 ft (152 to 915 m) in length. It is used to transport material between the gathering conveyor and the main haulage conveyor.
Industry:Mining
Generally 500 to 3,000 ft (approx. 150 to 1,000 m) in length. It is used to transport material between the intermediate haulage conveyor and a car-loading point or the outside.
Industry:Mining
Generally means land not very good for farming. Tens of millions of tons of coal are removed each year by stripping the surface of this type land.
Industry:Mining
