2017 Edition

sector 21

Mining, Quarrying, and Oil and Gas Extraction


The Mining, Quarrying, and Oil and Gas Extraction sector comprises establishments that extract naturally occurring mineral solids, such as coal and ores; liquid minerals, such as crude petroleum; and gases, such as natural gas. The term mining is used in the broad sense to include quarrying, well operations, beneficiating (e.g., crushing, screening, washing, and flotation), and other preparation customarily performed at the mine site, or as a part of mining activity.

The Mining, Quarrying, and Oil and Gas Extraction sector distinguishes two basic activities: mine operation and mining support activities. Mine operation includes establishments operating mines, quarries, or oil and gas wells on their own account or for others on a contract or fee basis. Mining support activities include establishments that perform exploration (except geophysical surveying) and/or other mining services on a contract or fee basis (except mine site preparation and construction of oil/gas pipelines).

Establishments in the Mining, Quarrying, and Oil and Gas Extraction sector are grouped and classified according to the natural resource mined or to be mined. Industries include establishments that develop the mine site, extract the natural resources, and/or those that beneficiate (i.e., prepare) the mineral mined. Beneficiation is the process whereby the extracted material is reduced to particles that can be separated into mineral and waste, the former suitable for further processing or direct use. The operations that take place in beneficiation are primarily mechanical, such as grinding, washing, magnetic separation, and centrifugal separation. In contrast, manufacturing operations primarily use chemical and electrochemical processes, such as electrolysis and distillation. However, some treatments, such as heat treatments, take place in both the beneficiation and the manufacturing (i.e., smelting/refining) stages. The range of preparation activities varies by mineral and the purity of any given ore deposit. While some minerals, such as petroleum and natural gas, require little or no preparation, others are washed and screened, while yet others, such as gold and silver, can be transformed into bullion before leaving the mine site.

Mining, beneficiating, and manufacturing activities often occur in a single location. Separate receipts will be collected for these activities whenever possible. When receipts cannot be broken out between mining and manufacturing, establishments that mine or quarry nonmetallic minerals, and then beneficiate the nonmetallic minerals into more finished manufactured products are classified based on the primary activity of the establishment. A mine that manufactures a small amount of finished products will be classified in Sector 21, Mining, Quarrying, and Oil and Gas Extraction. An establishment that mines whose primary output is a more finished manufactured product will be classified in Sector 31-33, Manufacturing.


  1. 211 - Oil and Gas Extraction
    1. 2111 - Oil and Gas Extraction
      1. 21112 - Crude Petroleum Extraction
        1. 211120 - Crude Petroleum Extraction
      2. 21113 - Natural Gas Extraction
        1. 211130 - Natural Gas Extraction
  2. 212 - Mining (except Oil and Gas)
    1. 2121 - Coal Mining
      1. 21211 - Coal Mining
        1. 212111 - Bituminous Coal and Lignite Surface Mining
        2. 212112 - Bituminous Coal Underground Mining
        3. 212113 - Anthracite Mining
    2. 2122 - Metal Ore Mining
      1. 21221 - Iron Ore Mining
        1. 212210 - Iron Ore Mining
      2. 21222 - Gold Ore and Silver Ore Mining
        1. 212221 - Gold Ore Mining
        2. 212222 - Silver Ore Mining
      3. 21223 - Copper, Nickel, Lead, and Zinc Mining
        1. 212230 - Copper, Nickel, Lead, and Zinc Mining
      4. 21229 - Other Metal Ore Mining
        1. 212291 - Uranium-Radium-Vanadium Ore Mining
        2. 212299 - All Other Metal Ore Mining
    3. 2123 - Nonmetallic Mineral Mining and Quarrying
      1. 21231 - Stone Mining and Quarrying
        1. 212311 - Dimension Stone Mining and Quarrying
        2. 212312 - Crushed and Broken Limestone Mining and Quarrying
        3. 212313 - Crushed and Broken Granite Mining and Quarrying
        4. 212319 - Other Crushed and Broken Stone Mining and Quarrying
      2. 21232 - Sand, Gravel, Clay, and Ceramic and Refractory Minerals Mining and Quarrying
        1. 212321 - Construction Sand and Gravel Mining
        2. 212322 - Industrial Sand Mining
        3. 212324 - Kaolin and Ball Clay Mining
        4. 212325 - Clay and Ceramic and Refractory Minerals Mining
      3. 21239 - Other Nonmetallic Mineral Mining and Quarrying
        1. 212391 - Potash, Soda, and Borate Mineral Mining
        2. 212392 - Phosphate Rock Mining
        3. 212393 - Other Chemical and Fertilizer Mineral Mining
        4. 212399 - All Other Nonmetallic Mineral Mining
  3. 213 - Support Activities for Mining
    1. 2131 - Support Activities for Mining
      1. 21311 - Support Activities for Mining
        1. 213111 - Drilling Oil and Gas Wells
        2. 213112 - Support Activities for Oil and Gas Operations
        3. 213113 - Support Activities for Coal Mining
        4. 213114 - Support Activities for Metal Mining
        5. 213115 - Support Activities for Nonmetallic Minerals (except Fuels) Mining


The NAICS editions in which this code was present are indicated below. In the event that a code was changed from the prior edition the equivalent value in that edition is provided for reference.

Edition Value
2002 21 -
2007 21 -
2012 21 -
2017 21 -

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