- 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 ...
A set of rolls or any apparatus for making thin plates of metal, such as gold, preliminary to beating.
Industry:Mining
A set of rules to guide electricians when installing electrical conductors, devices, and machinery.
Industry:Mining
A set of seismometers, placed along a straight line, that record the same shot.
Industry:Mining
A set of standard letters, signs, or marks used on mine ventilation plans to represent certain appliances or constructions to direct and control the flow of air underground.
Industry:Mining
A set of tables and associated information for correcting reversing thermometers and computing dynamic height anomalies; compiled by E.C. Lafond and published by the U.S. Navy Hydrographic Office as H.O. Pub. No. 617.
Industry:Mining
A set of teeth that are vertical on one side and sloped on the other; holds a pawl moving in one direction, but allows it to move in another.
Industry:Mining
A set of timber used in ground that requires greater support than a two-piece set or stull will provide. A cap is supported by two posts often spread apart at the bottom to give greater stability.
Industry:Mining
A set of timbers consisting of a cap and a single post. If the ground is loose and must be supported over the side or back, lagging, commonly of 2-in (5.1-cm) boards, is used. These boards extend from the center line of the post or cap to the middle of the next post or cap. If they are placed touching each other, such an arrangement is called tight lagging; if a few inches apart (which depends on the nature of the ground to be held back), it is called open lagging.
Industry:Mining
A set of timbers used to provide support in a stope or an underground mine. Each timber set consists of a vertical post and two horizontal members known as a cap and girt. The timber ends are sawed to allow adjoining timbers to interlock. They are framed at mutual right angles, and when joined with other sets form a continuous timber framework that conforms to the irregular shape of the stope. The posts are 6 to 7 ft (1.83 to 2.13 m) high, while the caps and girts are 4 to 6 ft (1.22 to 1.83 m) long. Caps and girts are placed on top of the posts, a line of caps being at right angles to a line of girts. Square sets vary in dimensions at different mines, but in general should give a clear opening of at least 5 ft (1.52 m) each way between posts to afford sufficient working space in the stope, and a clear height of 6-1/2 ft (1.98 m) is about the minimum height desirable. This system of timber support can be adapted to large and irregular orebodies resulting in an elaborate network extending the full height and width of a stope.
Industry:Mining
A set of tools, picks, shovels, wedges, hammers, etc., used for work underground.
Industry:Mining
