# Relationship history for MSHA mine 3607063

Current hierarchy: **Collier Clair--Randall & Sheldon Derck → Clair Collier → #13 Vein Slope Mine**

- 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:** Lone Pine Coal Company → #13 Vein Slope Mine; 1980-11-01 to 1986-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Derck Randall Et Al → #13 Vein Slope Mine; 1980-11-01 to 1989-07-04; source msha-controller-operator-history
- **controller_controls_operator:** Derck Randall Et Al → Lone Pine Coal Company; 1980-11-01 to 1986-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Clair Collier → #13 Vein Slope Mine; 1987-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Collier Clair--Randall & Sheldon Derck → #13 Vein Slope Mine; 1987-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Collier Clair--Randall & Sheldon Derck → Clair Collier; 1987-01-01 to current/open; source msha-controller-operator-history