# Relationship history for MSHA mine 4001089

Current hierarchy: **Cloud Peak Energy Resources LLC → Sequatchie Valley Coal Corp → No 1 Tipple**

- 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:** Sequatchie Valley Coal Corp-Walden Ridge Div → No 1 Tipple; 1950-01-01 to 1982-04-29; source msha-controller-operator-history
- **controller_controls_mine:** Studer Dale F & Paul J → No 1 Tipple; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Studer Dale F & Paul J → Sequatchie Valley Coal Corp-Walden Ridge Div; 1950-01-01 to 1982-04-29; source msha-controller-operator-history
- **operator_operates_mine:** Sequatchie Valley Coal Corp → No 1 Tipple; 1982-04-30 to 1993-06-01; source msha-controller-operator-history
- **controller_controls_mine:** MidAmerican Energy Holdings Company → No 1 Tipple; 1982-04-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** MidAmerican Energy Holdings Company → Sequatchie Valley Coal Corp; 1982-04-30 to 1993-06-01; source msha-controller-operator-history
- **operator_operates_mine:** Sequatchie Valley Coal Corp → No 1 Tipple; 1993-06-02 to 2012-09-12; source msha-controller-operator-history
- **controller_controls_mine:** RTZ-CRA Group → No 1 Tipple; 1993-06-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** RTZ-CRA Group → Sequatchie Valley Coal Corp; 1993-06-02 to 2012-09-12; source msha-controller-operator-history
- **operator_operates_mine:** Sequatchie Valley Coal Corp → No 1 Tipple; 2012-09-13 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cloud Peak Energy Resources LLC → No 1 Tipple; 2012-09-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cloud Peak Energy Resources LLC → Sequatchie Valley Coal Corp; 2012-09-13 to current/open; source msha-controller-operator-history