# Relationship history for MSHA mine 3607832

Current hierarchy: **Quintana Capital Group GP Ltd → Rox Coal Inc → Mine #37**

- 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:** NSM PLC → Mine #37; 1983-05-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Intercarbon Coal Co-Jennerstown Mining Inc Et Al → Mine #37; 1985-06-17 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Pbs Coals Inc → Mine #37; 1986-09-01 to 1989-09-18; source msha-controller-operator-history
- **controller_controls_operator:** NSM PLC → Pbs Coals Inc; 1986-09-01 to 1989-09-18; source msha-controller-operator-history
- **operator_operates_mine:** Lion Mining Company → Mine #37; 1989-09-19 to 1992-03-23; source msha-controller-operator-history
- **controller_controls_operator:** Intercarbon Coal Co-Jennerstown Mining Inc Et Al → Lion Mining Company; 1989-09-19 to 1992-03-23; source msha-controller-operator-history
- **controller_controls_mine:** NSM PLC → Mine #37; 1990-06-18 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Rox Coal Inc → Mine #37; 1992-03-24 to 1998-03-05; source msha-controller-operator-history
- **controller_controls_operator:** NSM PLC → Rox Coal Inc; 1992-03-24 to 1998-03-05; source msha-controller-operator-history
- **operator_operates_mine:** Rox Coal Inc → Mine #37; 1998-03-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Severstal Resources → Mine #37; 1998-03-06 to 2014-08-19; source msha-controller-operator-history
- **controller_controls_operator:** Severstal Resources → Rox Coal Inc; 1998-03-06 to 2014-08-19; source msha-controller-operator-history
- **controller_controls_mine:** Quintana Capital Group GP Ltd et al → Mine #37; 2014-08-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Quintana Capital Group GP Ltd et al → Rox Coal Inc; 2014-08-20 to current/open; source msha-controller-operator-history