# Relationship history for MSHA mine 0502815

Current hierarchy: **Wallace Joe-Val Ginn → Gold Ore Ltd Of Cripple Creek → Mary Nevin 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:** Gold Run Joint Venture → Mary Nevin Mine; 1950-01-01 to 1982-09-14; source msha-controller-operator-history
- **controller_controls_mine:** Cripple Creek Gold Production & Crown Central → Mary Nevin Mine; 1950-01-01 to 1982-09-14; source msha-controller-operator-history
- **controller_controls_operator:** Cripple Creek Gold Production & Crown Central → Gold Run Joint Venture; 1950-01-01 to 1982-09-14; source msha-controller-operator-history
- **controller_controls_mine:** Wallace Joe-Val Ginn Et Al → Mary Nevin Mine; 1981-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Gold Ore Ltd Of Cripple Creek → Mary Nevin Mine; 1982-09-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wallace Joe-Val Ginn Et Al → Gold Ore Ltd Of Cripple Creek; 1982-09-15 to current/open; source msha-controller-operator-history