- 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 ...
Two or more screens, usually of the vibrating type, placed one above the other for successive processing of the same run of material.
Industry:Mining
Two or more shotholes that are shot almost simultaneously. They are so spaced as to minimize near-surface interferences that mask desired signals if only one shothole is used.
Industry:Mining
Two polytypes, 8ZnS and 10ZnS, respectively, of wurtzite found at Joplin, MO; hexagonal. The wurtzite polytypes evidently form a homologous series (2H, 4H, 6H, etc.) resulting from growth phenomena based on screw dislocations.
Industry:Mining
Two sets of mining equipment operating simultaneously and sharing a common dumping point on the same section, with each set being ventilated by a separate split on intake air.
Industry:Mining
Two thermometer scales are in general use, the Fahrenheit, which is generally used in engineering, and the Celsius, which is almost universally used in scientific work. The Fahrenheit scale has the freezing point at 32 degrees F and the boiling point at 212 degrees F, whereas the Celsius scale has the freezing point at 0 degrees C and the boiling point at 100 degrees C. The Celsius scale is commonly called the centigrade scale.
Industry:Mining
Two waves that are propagated in opposite directions through the burned gases, and originating at the point where two explosion waves meet.
Industry:Mining
Two-rate valuation formula, once much used to determine present value (Vp) of mining properties or shares, with redemption of capital invested. Largely replaced by Morkill's formula.
Industry:Mining
Type of alloy suitable for forming by mechanical means at temperatures below the melting point.
Industry:Mining
