# Relationship history for MSHA mine 3608489

Current hierarchy: **Reading Anthracite Co; West Spring Slope Holdings LLC → West Spring Energy, LLC → West Spring Energy**

- 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:** Keystone Anthracite Company Inc → West Spring Energy; 1994-11-01 to 2011-08-18; source msha-controller-operator-history
- **controller_controls_mine:** Michael R  Burns → West Spring Energy; 1994-11-01 to 2011-02-28; source msha-controller-operator-history
- **controller_controls_operator:** Michael R  Burns → Keystone Anthracite Company Inc; 1994-11-01 to 2011-02-28; source msha-controller-operator-history
- **controller_controls_mine:** Robert  Burns → West Spring Energy; 2011-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert  Burns → Keystone Anthracite Company Inc; 2011-03-01 to 2011-08-18; source msha-controller-operator-history
- **operator_operates_mine:** West Spring Energy, LLC → West Spring Energy; 2011-08-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John W  Rich et al → West Spring Energy; 2011-08-19 to 2013-07-31; source msha-controller-operator-history
- **controller_controls_operator:** John W  Rich et al → West Spring Energy, LLC; 2011-08-19 to 2013-07-31; source msha-controller-operator-history
- **controller_controls_mine:** West Spring Slope Holdings LLC et al → West Spring Energy; 2013-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** West Spring Slope Holdings LLC et al → West Spring Energy, LLC; 2013-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Reading Anthracite Co et al → West Spring Energy, LLC; 2013-08-01 to current/open; source msha-controller-operator-history