| Naics index | Naics index description |
|---|---|
| 211120 | Oil shale mining and/or beneficiating |
| 211120 | Operating crude petroleum field gathering lines, except on a contract basis |
| 211120 | Petroleum, crude, production (i.e., extraction) |
| 211120 | Shale, oil, mining and/or beneficiating |
| 211120 | Stripper oil well production |
| 211120 | Tar sands mining |
| 211130 | Butane, natural, mining |
| 211130 | Casing-head butane and propane production |
| 211130 | Coal gasification at mine site |
| 211130 | Coal liquefaction at mine site |