- Industry: Mining
- Number of terms: 33118
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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 ...
One-twentieth troy ounce (1.56 g). Used in the United States and in England for the valuation of gold, silver, and jewels. Abbrev.: dwt; pwt.
Industry:Mining
One-twenty-fourth part. It is used to designate the fineness of gold; thus, 18-karat gold is 18/24 (or 75%) pure gold and 6/24 (or 25%) other alloying metal or metals. Not to be confused with carat.
Industry:Mining
Opal without play of color. Most varieties are of no gemological interest or importance; others because of their color or markings are set in jewelry. Compare: precious opal
Industry:Mining
Open-hearth furnace swung about its major axis when pouring out the melted product.
Industry:Mining
Openings made in the direction of the dip of the deposit. The gradient of the gravity incline is determined by the dip of the deposit. The ore mined is transported through them, usually to the next lower level drive.
Industry:Mining