# Relationship history for MSHA mine 3500387

Current hierarchy: **Baker Fred E → General Minerals Corp → Ibex - Bald Mountain**

- 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:** Chemical Lime Company → Ibex - Bald Mountain; 1950-01-01 to 1980-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Brandenthaler Anthony → Ibex - Bald Mountain; 1950-01-01 to 1992-11-17; source msha-controller-operator-history
- **controller_controls_operator:** Brandenthaler Anthony → Chemical Lime Company; 1950-01-01 to 1980-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Pacificorp (Now: Mid-American Energy Hldgs-C02046) → Ibex - Bald Mountain; 1980-09-01 to 1983-12-14; source msha-controller-operator-history
- **operator_operates_mine:** Ibex Mining Company → Ibex - Bald Mountain; 1980-10-01 to 1983-12-14; source msha-controller-operator-history
- **controller_controls_operator:** Pacificorp (Now: Mid-American Energy Hldgs-C02046) → Ibex Mining Company; 1980-10-01 to 1983-12-14; source msha-controller-operator-history
- **operator_operates_mine:** American Copper & Nickel Company Inc → Ibex - Bald Mountain; 1983-12-15 to 1991-05-06; source msha-controller-operator-history
- **controller_controls_mine:** Ibex Mining Company & American Copper & Nickel Co → Ibex - Bald Mountain; 1983-12-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ibex Mining Company & American Copper & Nickel Co → American Copper & Nickel Company Inc; 1983-12-15 to 1991-05-06; source msha-controller-operator-history
- **operator_operates_mine:** General Minerals Corp → Ibex - Bald Mountain; 1991-05-07 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Baker Fred E → Ibex - Bald Mountain; 1991-05-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Baker Fred E → General Minerals Corp; 1991-05-07 to current/open; source msha-controller-operator-history