Energy and Mining

This major group includes establishments primarily engaged in mining, developing mines, or exploring for metallic minerals (ores). These ores are valued chiefly for the metals they contain, which are recovered for use as such or as constituents of alloys, chemicals, pigments, or other products. This major group also includes all ore dressing and beneficiating operations, whether performed at mills operated in conjunction with the mines served or at mills, such as custom mills, operated separately. These operations include mills that crush, grind, wash, dry, sinter, calcine, or leach ore, as well as those that perform gravity or flotation separation. When performed by operators of the properties, exploration during the preliminary phases of operation should be classified according to the type of ore expected to be found.

This major group includes establishments primarily engaged in producing bituminous coal, anthracite, and lignite, as well as mining operations and preparation plants (also known as cleaning plants and washeries), whether or not they are operated in conjunction with mine sites.

This major group includes establishments primarily engaged in producing crude petroleum and natural gas extracting oil from oil sands and oil shale producing natural gasoline and cycle condensate and producing gas and hydrocarbon liquids from coal at the mine site. Types of activities included are exploration, drilling, oil and gas well operation and maintenance, the operation of natural gasoline and cycle plants, and the gasification, liquefaction, and pyrolysis of coal at the mine site. This major group also includes such basic activities as emulsion breaking and desilting of crude petroleum in the preparation of oil and gas customarily done at the field site.

This major group includes establishments primarily engaged in mining, quarrying, developing mines, or exploring for nonmetallic minerals, excluding fuels. It also includes certain well and brine operations, as well as primary preparation plants involved in activities such as crushing, grinding, washing, or other forms of concentration. Establishments primarily engaged in crushing, pulverizing, or otherwise treating nonmetallic minerals are classified under Mining, regardless of whether they operate in conjunction with mines.