# Relationship history for MSHA mine 1519773

Current hierarchy: **ACNR Holdings, Inc → Kentucky Land Resources, Inc → Hickory Ridge**

- 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:** Armstrong Energy Inc → Hickory Ridge; 2007-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Armstrong Coal Co. Inc. → Hickory Ridge; 2014-12-12 to 2018-02-13; source msha-controller-operator-history
- **controller_controls_operator:** Armstrong Energy Inc → Armstrong Coal Co. Inc.; 2014-12-12 to 2018-02-13; source msha-controller-operator-history
- **operator_operates_mine:** Western Kentucky Resources, LLC → Hickory Ridge; 2018-02-14 to 2020-09-16; source msha-controller-operator-history
- **controller_controls_mine:** Western Kentucky Consolidated Resources, LLC → Hickory Ridge; 2018-02-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Western Kentucky Consolidated Resources, LLC → Western Kentucky Resources, LLC; 2018-02-14 to 2020-09-16; source msha-controller-operator-history
- **operator_operates_mine:** Kentucky Land Resources, Inc → Hickory Ridge; 2020-09-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** ACNR Holdings, Inc → Hickory Ridge; 2020-09-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** ACNR Holdings, Inc → Kentucky Land Resources, Inc; 2020-09-17 to current/open; source msha-controller-operator-history