# Thunder Basin Coal Company LLC, Black Thunder (Campbell County, WY): MSHA citation under 77.404(a) (2026-05-20)

**Safety Need Score:** 30/100

| Field | Value |
|---|---|
| Company | Thunder Basin Coal Company LLC |
| Mine | Black Thunder (ID 4800977) |
| Location | Campbell County, WY |
| Commodity | Coal (Bituminous) |
| Mine type | Surface |
| Employees | 408 |
| Issued | 2026-05-20 |
| Action | Citation |
| Standard | 77.404(a) |
| Significant & substantial | No |
| Negligence | Low |
| Proposed penalty | $193 |
| Contested | No |

## Why this score
- Machine guarding / equipment standard (equipment-supplier trigger).

Source: US DOL Mine Safety and Health Administration (MSHA) Open Government Data, company violators only (https://www.msha.gov/data-and-reports/mine-data-retrieval-system?mineId=4800977). Last refreshed: 2026-11-04T01:31:23.849Z.
Data comes from MSHA Open Government Data files, which MSHA updates weekly; citations can appear days to weeks after issue, and proposed penalties are often blank until assessed months later. Citations can be modified, vacated or contested; confirm on the MSHA Mine Data Retrieval System. Company violators only; individual agents are excluded. Not a consumer report and may not be used for FCRA purposes. Informational only; not legal or safety advice.