# Relationship history for MSHA mine 3609314

Current hierarchy: **Keel Infrastructure Corp → Clearfield Properties Inc. → North Camp Run Mine**

- 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

- **controller_controls_mine:** Scrubgrass Generating Company LP → North Camp Run Mine; 1993-09-17 to 2025-03-26; source msha-controller-operator-history
- **controller_controls_mine:** U S Operating Services Holdings Inc → North Camp Run Mine; 1994-07-01 to 2011-01-02; source msha-controller-operator-history
- **operator_operates_mine:** Clearfield Properties Inc → North Camp Run Mine; 2005-03-14 to 2006-10-25; source msha-controller-operator-history
- **controller_controls_operator:** Scrubgrass Generating Company LP → Clearfield Properties Inc; 2005-03-14 to 2006-10-25; source msha-controller-operator-history
- **operator_operates_mine:** U.S. Operating Services Company → North Camp Run Mine; 2006-10-26 to 2012-02-13; source msha-controller-operator-history
- **controller_controls_operator:** U S Operating Services Holdings Inc → U.S. Operating Services Company; 2006-10-26 to 2011-01-02; source msha-controller-operator-history
- **controller_controls_mine:** Calypso Energy Holdings LLC → North Camp Run Mine; 2011-01-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Calypso Energy Holdings LLC → U.S. Operating Services Company; 2011-01-03 to 2012-02-13; source msha-controller-operator-history
- **operator_operates_mine:** Clearfield Properties Inc. → North Camp Run Mine; 2012-02-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Scrubgrass Generating Company LP → Clearfield Properties Inc.; 2012-02-14 to 2025-03-26; source msha-controller-operator-history
- **controller_controls_mine:** Keel Infrastructure Corp → North Camp Run Mine; 2025-03-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Keel Infrastructure Corp → Clearfield Properties Inc; 2025-03-27 to 2006-10-25; source msha-controller-operator-history
- **controller_controls_operator:** Keel Infrastructure Corp → Clearfield Properties Inc.; 2025-03-27 to current/open; source msha-controller-operator-history