Piper Ventures LLC; Pronghorn LLC; Isom Brothers Holding LLC controller
MSHA controller ID: 0170380
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Email me when a new MSHA incident is filed at any mine Piper Ventures LLC; Pronghorn LLC; Isom Brothers Holding LLC controls.
- Fatalities
- 0
- Total incidents
- 9
- Mines on record
- 3
- Years on record
- 2022–2025
Compliance record
MSHA citations since 2022
118
citations
37
significant & substantial
$310,069
proposed penalties
$136,748
paid to date
Source: MSHA violations data, updated weekly.
Top causes
- HANDLING OF MATERIALS 4 non-fatal
- IGNITION OR EXPLOSION OF GAS OR DUST 3 non-fatal
- MACHINERY 1 non-fatal
- SLIP OR FALL OF PERSON 1 non-fatal
Incident timeline
2025
1
2023
6
2022
2
Operators under this controller
Mines on record
- Bainville MT
- Eaton Ranch ND
- Hazen Mine ND