# Relationship history for MSHA mine 2301278

Current hierarchy: **Jarnail S Sarai; Manjit K Sarai → G&K Sarai Company → Rockridge Quarry**

- 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

- **operator_operates_mine:** Beyer Crushed Rock Company → Rockridge Quarry; 1950-01-01 to 1986-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Kevin R  Fahey → Rockridge Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kevin R  Fahey → Beyer Crushed Rock Company; 1950-01-01 to 1986-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Five Star Mining-Limited Partnership → Rockridge Quarry; 1987-01-01 to 1990-02-28; source msha-controller-operator-history
- **controller_controls_mine:** Star Mining Corp → Rockridge Quarry; 1987-01-01 to 1990-02-28; source msha-controller-operator-history
- **controller_controls_operator:** Star Mining Corp → Five Star Mining-Limited Partnership; 1987-01-01 to 1990-02-28; source msha-controller-operator-history
- **operator_operates_mine:** Mason Land Reclamation Company Inc → Rockridge Quarry; 1990-03-01 to 2000-07-16; source msha-controller-operator-history
- **controller_controls_mine:** Norcal Solid Waste Systems Inc → Rockridge Quarry; 1990-03-01 to 2000-07-16; source msha-controller-operator-history
- **controller_controls_operator:** Norcal Solid Waste Systems Inc → Mason Land Reclamation Company Inc; 1990-03-01 to 2000-07-16; source msha-controller-operator-history
- **operator_operates_mine:** G&K Sarai Company → Rockridge Quarry; 2000-07-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Michael D  Pursell → Rockridge Quarry; 2000-07-17 to 2021-06-11; source msha-controller-operator-history
- **controller_controls_operator:** Michael D  Pursell → G&K Sarai Company; 2000-07-17 to 2021-06-11; source msha-controller-operator-history
- **controller_controls_mine:** Jarnail S Sarai et al → Rockridge Quarry; 2021-06-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jarnail S Sarai et al → G&K Sarai Company; 2021-06-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Manjit K Sarai et al → G&K Sarai Company; 2021-06-12 to current/open; source msha-controller-operator-history