Variant of NAICS 2012 - Energy sector
- E - Energy sector
- 21i - E - Mining, quarrying, and oil and gas extraction
- 212i - E - Mining and quarrying (except oil and gas)
- 2121 - Coal mining
- 21211 - Coal mining
- 212114 - Bituminous coal miningCAN
- 212115 - Subbituminous coal miningCAN
- 212116 - Lignite coal miningCAN
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