Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Built Environment (hierarchy name)
4. Built Complexes and Districts (hierarchy name)
5. complexes (buildings and sites)
6. [complexes by function]
7. industrial complexes
8. extracting complexes

Narrower term/s

• coal mines
• copper mines
• iron mines
• tin mines
• diamond mines
• silver mines
• gold mines
• salt mines
• lead mines
• flint mines
• inactive mines
• shaft mines
• chrome mines
• nickel mines
• placer mines

Anotations

Scope note:

Excavation or systems of excavations, including pits or tunnels, made underground for the extraction of metals, metallic ores, coal, salt, precious stones, building stone, clay, or another substance, or an open-air excavation for the extraction of such substances.