2123 - Nonmetallic Mineral Mining and Quarrying
Top Businesses by Annual Sales for 2123 – Click for Complete Profiles:
|Vulcan Materials Company||Compass Minerals Intl Inc|
|Martin Marietta Materials Inc||US Borax Inc|
|Carmeuse Lime Inc||Carmeuse Lime & Stone Inc|
|Summit Materials Inc||US Silica Holdings Inc|
|Minerals Technologies Inc||Granite Rock Co|
This industry group comprises establishments primarily engaged in developing mine sites, or in mining or quarrying nonmetallic minerals (except fuels). Also included are certain well and brine operations, and preparation plants primarily engaged in beneficiating (e.g., crushing, grinding, washing, and concentrating) nonmetallic minerals.
Beneficiation is the process whereby the extracted material is reduced to particles which 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.