- 行业: 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 ...
The firing of small charges of dynamite 2 ft or 3 ft (0.6 m or 0.9 m) below the surface for breaking up impervious strata of soil, clay, etc., for aerating, draining, and moistening the soil.
Industry:Mining
The firing of small explosive charges for releasing stuck drilling tools in a borehole. The shock of detonation causes the joint to expand and unscrew slightly. All rods above the joint can then be removed from the hole.
Industry:Mining
The first 150 ft (46 m) or so of shaft sinking from the surface, during which time the plant and services for the main shaft sinking are installed. Sometimes, the main sinking contract does not commence until the foreshaft has been completed.
Industry:Mining
The first and leading excavations in mines that are made for the purpose of opening out or winning the material being mined, and that are intended to be the principal roadways of the mine.
Industry:Mining
The first bench in a quarry which is blasted out. It is usually at the top of the rock to be quarried.
Industry:Mining
The first hole or holes fired in a round blasted off the solid to create an additional free face in a coal mine.
Industry:Mining
The first indication of roof pressure that takes place after the removal of coal from a seam.
Industry:Mining
The first of a series of washboxes, which receives the feed and from which one product at least is given further treatment.
Industry:Mining
