# Relationship history for MSHA mine 1506287

Current hierarchy: **Nick A  Cooley → Gap Fork Fuels Inc → No 1**

- 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:** Premium Elkhorn Coal Corp → No 1; 1950-01-01 to 1983-06-15; source msha-controller-operator-history
- **controller_controls_mine:** Nick A  Cooley et al → No 1; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nick A  Cooley et al → Premium Elkhorn Coal Corp; 1950-01-01 to 1983-06-15; source msha-controller-operator-history
- **operator_operates_mine:** Shannon Coal Company Inc → No 1; 1983-06-16 to 1985-11-18; source msha-controller-operator-history
- **controller_controls_mine:** Carter Robert → No 1; 1983-06-16 to 1992-04-29; source msha-controller-operator-history
- **controller_controls_operator:** Carter Robert → Shannon Coal Company Inc; 1983-06-16 to 1985-11-18; source msha-controller-operator-history
- **operator_operates_mine:** Gap Fork Fuels Inc → No 1; 1985-11-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Nick A  Cooley et al → No 1; 1985-11-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nick A  Cooley et al → Gap Fork Fuels Inc; 1985-11-19 to current/open; source msha-controller-operator-history