# Relationship history for MSHA mine 4202241

Current hierarchy: **ACNR Holdings, Inc → Emery County Coal Resources, Inc. → Lila Canyon**

- 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:** Utah American Energy, Inc. → Lila Canyon; 1999-02-24 to 2020-09-16; source msha-controller-operator-history
- **controller_controls_mine:** Robert E  Murray → Lila Canyon; 1999-02-24 to 2020-09-16; source msha-controller-operator-history
- **controller_controls_operator:** Robert E  Murray → Utah American Energy, Inc.; 1999-02-24 to 2020-09-16; source msha-controller-operator-history
- **controller_controls_mine:** ACNR Holdings, Inc → Lila Canyon; 2020-09-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** ACNR Holdings, Inc → Utah American Energy, Inc.; 2020-09-17 to 2020-09-16; source msha-controller-operator-history
- **operator_operates_mine:** Emery County Coal Resources, Inc. → Lila Canyon; 2020-09-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** ACNR Holdings, Inc → Emery County Coal Resources, Inc.; 2020-09-17 to current/open; source msha-controller-operator-history