Variant of North American Industry Classification System (NAICS) 2022 Version 1.0 for 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

This industry group comprises establishments primarily engaged in mining bituminous and lignite coal by underground mining, and auger mining, strip mining, culm bank mining and other surface mining. Mining operations and preparation plants (also known as cleaning plants and washeries), whether or not such plants are operated in conjunction with mine sites, are included.