- 업종: 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 ...
A course of some compressible substance, such as soft wood, inserted between more rigid material. In mine support, it can be placed between the footwall or the hanging wall and the concrete, or internally in the support.
Industry:Mining
A covellite that occurs in cubes with cubic cleavage and is probably pseudomorphous after chalcopyrite that had replaced galena; from the Canton Mine, Georgia.
Industry:Mining
A cover or canopy developed by the U.S. Bureau of Mines for the protection of mine workers and machines at the face of a mechanized coal heading. Hydraulic rams telescope and steer the shield forward as the face advances. It enables continuous miners to operate with greater safety.
Industry:Mining
A covered ditch containing a layer of fitted or loose stone or other pervious material.
Industry:Mining
A crack produced in fine-grained sediment or rock by the loss of contained water during drying or dehydration; e.g., a desiccation crack or a mud crack.
Industry:Mining
A cradle, frame, jigging machine, washer, or other device or machine used in separating the metal from broken ore, or ore from worthless rock.
Industry:Mining
A crane driven by gasoline, diesel, or electric motor, traveling on crawler tracks, pneumatic tires or solid rubber tires, and capable of moving in any direction under its own power.
Industry:Mining
