# Relationship history for MSHA mine 1513406

Current hierarchy: **William B  Sturgill → Big Elk Creek Coal Company Inc → Orchard Branch**

- 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:** Hylton Oliver W → Orchard Branch; 1979-05-01 to 1983-08-31; source msha-controller-operator-history
- **operator_operates_mine:** Big Elk Creek Coal Company Inc → Orchard Branch; 1982-03-01 to 1983-08-31; source msha-controller-operator-history
- **controller_controls_operator:** Hylton Oliver W → Big Elk Creek Coal Company Inc; 1982-03-01 to 1983-08-31; source msha-controller-operator-history
- **operator_operates_mine:** Big Elk Creek Coal Company Inc → Orchard Branch; 1983-09-01 to 1984-09-24; source msha-controller-operator-history
- **controller_controls_mine:** Paul J  Sturgill → Orchard Branch; 1983-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Paul J  Sturgill → Big Elk Creek Coal Company Inc; 1983-09-01 to 1984-09-24; source msha-controller-operator-history
- **controller_controls_mine:** Leroy  Lackey et al → Orchard Branch; 1984-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Royal Elkhorn Inc → Orchard Branch; 1984-09-25 to 1989-04-03; source msha-controller-operator-history
- **controller_controls_operator:** Leroy  Lackey et al → Royal Elkhorn Inc; 1984-09-25 to 1989-04-03; source msha-controller-operator-history
- **controller_controls_mine:** William B  Sturgill → Orchard Branch; 1987-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Big Elk Creek Coal Company Inc → Orchard Branch; 1989-04-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William B  Sturgill → Big Elk Creek Coal Company Inc; 1989-04-04 to current/open; source msha-controller-operator-history