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agricultural_minerals_ops (0)
construction_minerals_ops (1)
crushed_stone_ops (2)
ferrous_metal_mines (3)
ferrous_metal_processing_plants (4)
mines_and_mineral_resources (5)
miscellaneous_industrial_mineral_ops (6)
nonferrous_metal_mines (7)
nonferrous_metal_processing_plants (8)
refractory_abrasive_and_other_ind_mineral_ops (9)
sand_and_gravel_ops (10)
uranium_and_vanadium_deposits (11)
us_coal_fields (12)
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