# Relationship history for MSHA mine 4200988

Current hierarchy: **(Donald) Todd  Kiscaden; Scott  Kiscaden → Horizon Coal Corp → Deseret**

- 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

- **controller_controls_mine:** Mc Arthur Shirl C → Deseret; 1950-01-01 to 1979-05-11; source msha-controller-operator-history
- **operator_operates_mine:** American Coal Company → Deseret; 1972-11-01 to 1979-03-20; source msha-controller-operator-history
- **controller_controls_operator:** Mc Arthur Shirl C → American Coal Company; 1972-11-01 to 1979-03-20; source msha-controller-operator-history
- **operator_operates_mine:** Emery Mining Corp → Deseret; 1979-03-21 to 1986-04-27; source msha-controller-operator-history
- **controller_controls_mine:** Savage Companies → Deseret; 1979-03-21 to 1986-04-27; source msha-controller-operator-history
- **controller_controls_operator:** Savage Companies → Emery Mining Corp; 1979-03-21 to 1986-04-27; source msha-controller-operator-history
- **operator_operates_mine:** Utah Power & Light Company-Mining Division → Deseret; 1986-04-28 to 1997-11-03; source msha-controller-operator-history
- **controller_controls_mine:** MidAmerican Energy Holdings Company → Deseret; 1986-04-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** MidAmerican Energy Holdings Company → Utah Power & Light Company-Mining Division; 1986-04-28 to 1997-11-03; source msha-controller-operator-history
- **controller_controls_mine:** Scott  Kiscaden et al → Deseret; 1997-07-11 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Horizon Coal Corp → Deseret; 1997-11-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Scott  Kiscaden et al → Horizon Coal Corp; 1997-11-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** (Donald) Todd  Kiscaden et al → Horizon Coal Corp; 1997-11-04 to current/open; source msha-controller-operator-history