- 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 ...
A silvery-white, very hard, metallic element. Symbol, Mo. Does not occur native, but is obtained principally from molybdenite. Wulfenite (PbMoO<sub>4</sub>), and powellite (Ca(MoW)O<sub>4</sub>) are also minor commercial ores. Valuable as an alloying agent with steel and nickel. Used for electrodes in electrically heated glass furnaces, in nuclear energy applications, and for missile and aircraft parts.
Industry:Mining
A simple appliance used in the search for gold and other heavy minerals. By means of water washing, the lighter, worthless material is separated from the valuable, heavier minerals, which are made visible by concentration and retention in the dish. Standard dishes with sloping sides are made in sizes ranging from top diameter 10 to 18 in (25 to 46 cm) and from 2 to 4 in (5 to 10 cm) deep, with riffles or grooves to retain the heavy minerals.
Industry:Mining
A simple appliance used in the search for gold and other heavy minerals. By means of water washing, the lighter, worthless material is separated from the valuable, heavier minerals, which are made visible by concentration and retention in the dish. Standard dishes with sloping sides are made in sizes ranging from top diameter 10 to 18 in (25 to 46 cm) and from 2 to 4 in (5 to 10 cm) deep, with riffles or grooves to retain the heavy minerals.
Industry:Mining
A simple arrangement of two stout timbers, sliding on pivots, one of which can be placed across the track rail and held in position by the other block. They are often used on haulage landings to prevent trams running down the incline uncontrolled.
Industry:Mining
A simple arrangement of two stout timbers, sliding on pivots, one of which can be placed across the track rail and held in position by the other block. They are often used on haulage landings to prevent trams running down the incline uncontrolled.
Industry:Mining
A simple form of sand pump or sludger consisting of a hollow cylinder with a ball or clack valve at the bottom, which is used with a flush of water to remove detritus.
Industry:Mining
A simple instrument made of two bars forming a right-angled cross with sights at each end and used in setting out right angles in surveying.
Industry:Mining
A simple method of disposing of mine water using tanks with an engine or a motor on the surface. The machinery can be easily repaired and the plant is in no danger of being flooded. The high cost of this system and the fact that the shaft cannot be used for other purposes while water is being hoisted are important disadvantages. Water is delivered intermittently and at a decreasing rate as the depth of hoisting increases. This method is less economical than pumping but is useful as an emergency measure in reclaiming a flooded mine.
Industry:Mining
A simple method of regulating the flow of lump ore in a chute. It consists of several heavy pivoted hammers that allow fine ore to pass through, but check the passage of lumps.
Industry:Mining
