# Relationship history for MSHA mine 4801679

Current hierarchy: **New Era Petroleum (Jersey) Ltd → New Era Petroleum, Inc. → Greybull Field Project**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Greybull Petroleum LLC → Greybull Field Project; 2005-08-11 to 2007-05-06; source msha-controller-operator-history
- **controller_controls_mine:** Joe  McPhie → Greybull Field Project; 2005-08-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joe  McPhie → Greybull Petroleum LLC; 2005-08-11 to 2007-05-06; source msha-controller-operator-history
- **controller_controls_operator:** Rich  Couilard et al → Greybull Petroleum LLC; 2005-08-11 to 2007-05-06; source msha-controller-operator-history
- **controller_controls_mine:** Joe  McPhie → Greybull Field Project; 2007-01-29 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Rock Well Petroleum (US), Inc → Greybull Field Project; 2007-05-07 to 2010-03-05; source msha-controller-operator-history
- **controller_controls_operator:** Joe  McPhie → Rock Well Petroleum (US), Inc; 2007-05-07 to 2010-03-05; source msha-controller-operator-history
- **controller_controls_operator:** Rich  Couilard et al → Rock Well Petroleum (US), Inc; 2007-05-07 to 2010-03-05; source msha-controller-operator-history
- **operator_operates_mine:** New Era Petroleum, Inc. → Greybull Field Project; 2010-03-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** New Era Petroleum (Jersey) Ltd et al → Greybull Field Project; 2010-03-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** New Era Petroleum (Jersey) Ltd et al → New Era Petroleum, Inc.; 2010-03-06 to current/open; source msha-controller-operator-history