| | | | 21211 | Coal Mining | 5 | | Coal Mining 21211 | Coal Mining 2121 | Mining (except Oil and
Gas) 212 | Mining, Quarrying, and
Oil and Gas Extraction 21 |
| | | | 212111 | Bituminous Coal and
Lignite Surface Mining | 6 | Bituminous Coal and
Lignite Surface Mining 212111 | Coal Mining 21211 | Coal Mining 2121 | Mining (except Oil and
Gas) 212 | Mining, Quarrying, and
Oil and Gas Extraction 21 |
| | | | 212112 | Bituminous Coal
Underground Mining | 6 | Bituminous Coal
Underground Mining 212112 | Coal Mining 21211 | Coal Mining 2121 | Mining (except Oil and
Gas) 212 | Mining, Quarrying, and
Oil and Gas Extraction 21 |
| | | | 212113 | Anthracite Mining | 6 | Anthracite Mining 212113 | Coal Mining 21211 | Coal Mining 2121 | Mining (except Oil and
Gas) 212 | Mining, Quarrying, and
Oil and Gas Extraction 21 |
| | | | 2122 | Metal Ore Mining | 4 | | | Metal Ore Mining 2122 | Mining (except Oil and
Gas) 212 | Mining, Quarrying, and
Oil and Gas Extraction 21 |
| | | | 21221 | Iron Ore Mining | 5 | | Iron Ore Mining 21221 | Metal Ore Mining 2122 | Mining (except Oil and
Gas) 212 | Mining, Quarrying, and
Oil and Gas Extraction 21 |
| | | | 212210 | Iron Ore Mining | 6 | Iron Ore Mining 212210 | Iron Ore Mining 21221 | Metal Ore Mining 2122 | Mining (except Oil and
Gas) 212 | Mining, Quarrying, and
Oil and Gas Extraction 21 |
| | | | 21222 | Gold Ore and Silver Ore
Mining | 5 | | Gold Ore and Silver Ore
Mining 21222 | Metal Ore Mining 2122 | Mining (except Oil and
Gas) 212 | Mining, Quarrying, and
Oil and Gas Extraction 21 |
| | | | 212221 | Gold Ore Mining | 6 | Gold Ore Mining 212221 | Gold Ore and Silver Ore
Mining 21222 | Metal Ore Mining 2122 | Mining (except Oil and
Gas) 212 | Mining, Quarrying, and
Oil and Gas Extraction 21 |
| | | | 212222 | Silver Ore Mining | 6 | Silver Ore Mining 212222 | Gold Ore and Silver Ore
Mining 21222 | Metal Ore Mining 2122 | Mining (except Oil and
Gas) 212 | Mining, Quarrying, and
Oil and Gas Extraction 21 |
