# Relationship history for MSHA mine 1516536

Current hierarchy: **Ball James C - Diane Hunt → Dark Hill Enterprises Inc → Surface 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:** Dark Hill Enterprise Inc → Surface Mine; 1988-12-01 to 1989-11-05; source msha-controller-operator-history
- **controller_controls_mine:** Salyers George → Surface Mine; 1988-12-01 to 1989-11-05; source msha-controller-operator-history
- **controller_controls_operator:** Salyers George → Dark Hill Enterprise Inc; 1988-12-01 to 1989-11-05; source msha-controller-operator-history
- **operator_operates_mine:** Dark Hill Enterprises Inc → Surface Mine; 1989-11-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ball James C - Diane Hunt Et Al → Surface Mine; 1989-11-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ball James C - Diane Hunt Et Al → Dark Hill Enterprises Inc; 1989-11-06 to current/open; source msha-controller-operator-history