# Relationship history for MSHA mine 0502838

Current hierarchy: **MidAmerican Energy Holdings Company; Platte River Power Authority; Salt → Trapper Mining Inc → Trapper 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:** Trapper Mining Inc → Trapper Mine; 1976-01-01 to 1983-07-20; source msha-controller-operator-history
- **controller_controls_mine:** General Electric Company → Trapper Mine; 1976-01-01 to 1983-07-20; source msha-controller-operator-history
- **controller_controls_operator:** General Electric Company → Trapper Mining Inc; 1976-01-01 to 1983-07-20; source msha-controller-operator-history
- **operator_operates_mine:** Trapper Mining Inc → Trapper Mine; 1983-07-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Tri-State Generation & Transmsn Assoc et al → Trapper Mine; 1983-07-21 to 2020-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Tri-State Generation & Transmsn Assoc et al → Trapper Mining Inc; 1983-07-21 to 2020-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Salt River Project et al → Trapper Mining Inc; 1983-07-21 to 2020-12-31; source msha-controller-operator-history
- **controller_controls_operator:** MidAmerican Energy Holdings Company et al → Trapper Mining Inc; 1983-07-21 to 2020-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Salt River Project et al → Trapper Mine; 2021-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Salt River Project et al → Trapper Mining Inc; 2021-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** MidAmerican Energy Holdings Company et al → Trapper Mining Inc; 2021-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Platte River Power Authority et al → Trapper Mining Inc; 2021-01-01 to current/open; source msha-controller-operator-history