# Relationship history for MSHA mine 3303336

Current hierarchy: **Ricky D  Kirk; Jerry  Wells Jr → Carbon River Coal, Corp → Sands Hill Strip #2**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Alan  Arthur et al → Sands Hill Strip #2; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sands Hill Coal Co., Inc. → Sands Hill Strip #2; 1975-07-01 to 2007-12-14; source msha-controller-operator-history
- **controller_controls_operator:** Alan  Arthur et al → Sands Hill Coal Co., Inc.; 1975-07-01 to 2007-12-14; source msha-controller-operator-history
- **controller_controls_mine:** Ricky D  Kirk  et al → Sands Hill Strip #2; 1984-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sands Hill Mining LLC → Sands Hill Strip #2; 2007-12-15 to 2022-06-09; source msha-controller-operator-history
- **controller_controls_mine:** Wexford Capital LLC → Sands Hill Strip #2; 2007-12-15 to 2010-10-04; source msha-controller-operator-history
- **controller_controls_operator:** Wexford Capital LLC → Sands Hill Mining LLC; 2007-12-15 to 2010-10-04; source msha-controller-operator-history
- **controller_controls_mine:** Rhino Resource Partners LP → Sands Hill Strip #2; 2010-10-05 to 2017-11-07; source msha-controller-operator-history
- **controller_controls_operator:** Rhino Resource Partners LP → Sands Hill Mining LLC; 2010-10-05 to 2017-11-07; source msha-controller-operator-history
- **controller_controls_mine:** SF Contracting LLC → Sands Hill Strip #2; 2017-11-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** SF Contracting LLC → Sands Hill Mining LLC; 2017-11-08 to 2022-06-09; source msha-controller-operator-history
- **operator_operates_mine:** Carbon River Coal, Corp → Sands Hill Strip #2; 2022-06-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ricky D  Kirk  et al → Carbon River Coal, Corp; 2022-06-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jerry  Wells Jr  et al → Carbon River Coal, Corp; 2022-06-10 to current/open; source msha-controller-operator-history