- 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 ...
Eng. Black slaty stone overlying coal seams, Somerset Coalfields. Also spelled werk.
Industry:Mining
Eng. Blue building stone, forming a bed of irregular anvil-shaped blocks.
Industry:Mining
Eng. Coal seams lying at a depth of 1,800 ft (549 m) or more below the surface.
Industry:Mining