# Relationship history for MSHA mine 4801121

Current hierarchy: **Lighthouse Resources Inc; Anadarko Petroleum Corporation → Black Butte Coal Company → Leucite Hills 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:** Prospect Point Coal Company → Leucite Hills Mine; 1977-01-01 to 1988-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Union Pacific Corp → Leucite Hills Mine; 1977-01-01 to 1988-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Union Pacific Corp → Prospect Point Coal Company; 1977-01-01 to 1988-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Anadarko Petroleum Corporation  et al → Leucite Hills Mine; 1978-02-01 to 2015-04-12; source msha-controller-operator-history
- **operator_operates_mine:** Black Butte Coal Company → Leucite Hills Mine; 1988-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Anadarko Petroleum Corporation  et al → Black Butte Coal Company; 1988-06-01 to 2015-04-12; source msha-controller-operator-history
- **controller_controls_operator:** Ambre Energy Limited et al → Black Butte Coal Company; 1988-06-01 to 2015-04-12; source msha-controller-operator-history
- **controller_controls_mine:** Anadarko Petroleum Corporation et al → Leucite Hills Mine; 2015-04-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Anadarko Petroleum Corporation et al → Black Butte Coal Company; 2015-04-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lighthouse Resources Inc et al → Black Butte Coal Company; 2015-04-13 to current/open; source msha-controller-operator-history