# Relationship history for MSHA mine 4604780

Current hierarchy: **Continental Resources & Mineral Corp → Cheyenne Mining Company → No 1 Surface**

- 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:** Roadway Builders Inc → No 1 Surface; 1975-08-28 to 1976-09-16; source msha-controller-operator-history
- **controller_controls_mine:** Burkholder Robert C → No 1 Surface; 1975-08-28 to 1976-09-16; source msha-controller-operator-history
- **controller_controls_operator:** Burkholder Robert C → Roadway Builders Inc; 1975-08-28 to 1976-09-16; source msha-controller-operator-history
- **operator_operates_mine:** Mc Namee-Cheyenne → No 1 Surface; 1976-09-17 to 1978-12-10; source msha-controller-operator-history
- **controller_controls_mine:** Mc Namee Charles R--Jack Robertson & Leonard Hovis → No 1 Surface; 1976-09-17 to 1979-06-28; source msha-controller-operator-history
- **controller_controls_operator:** Mc Namee Charles R--Jack Robertson & Leonard Hovis → Mc Namee-Cheyenne; 1976-09-17 to 1978-12-10; source msha-controller-operator-history
- **operator_operates_mine:** Cheyenne Mining Company → No 1 Surface; 1978-12-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Continental Resources & Mineral Corp → No 1 Surface; 1978-12-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Continental Resources & Mineral Corp → Cheyenne Mining Company; 1978-12-11 to current/open; source msha-controller-operator-history