- 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 ...
In magnetic prospecting, the smoothed value of a magnetic field component as derived from a large-scale survey, worldwide or of continental scope. The normal field of the Earth varies slowly with time, and maps of it are as of a certain date.
Industry:Mining
In many mines a rapid and efficient means of erecting stoppings and walls for the control of ventilation near the face. The walls of doors and air crossings in the workings are often entirely of interlocked sandbags. This method minimizes the use of brattice and gives more permanent results in the workings.
Industry:Mining
In marble working, a defective or disfigured place in a marble block, which is cut out and filled with a composition. Also spelled terrace.
Industry:Mining
In marine seismic exploration, a boat equipped to carry explosives, and from which the placing and firing of shots are performed.
Industry:Mining
In measurement of magnetic strength, the number of unit poles in the measured field. One unit pole is the strength in a vacuum required to exert 1 dyn in a 1-cm gap between poles.
Industry:Mining
In mechanized mining, the arm that extends between the fulcrum jack and the swivel or angle trough or turn.
Industry:Mining
In metal mining, a person who directs and regulates the storage of iron ores of various grades in bins at shipping docks so that the grade of ore contained in each bin will contain the approximate percentage of iron guaranteed to the buyer (iron and steel mills).
Industry:Mining
In metal mining, a person who installs sets of timbers to support the walls of a shaft, working with the shaft sinking crew and installing the timbers as the work advances.
Industry:Mining
In metal mining, a person who keeps a record of the number of containers (cars, buckets, or skips) raised to the surface, and the amount of ore contained in each, estimating or weighing the contents.
Industry:Mining
