# Relationship history for MSHA mine 1001740

Current hierarchy: **Leighton Holdings Ltd & Reading & Bates Corp → Argee Corp → Thunder Mountain-Lightning Peak Pit**

- 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:** Leighton Holdings Ltd & Reading & Bates Corp → Thunder Mountain-Lightning Peak Pit; 1979-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Argee Corp → Thunder Mountain-Lightning Peak Pit; 1986-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Leighton Holdings Ltd & Reading & Bates Corp → Argee Corp; 1986-06-01 to current/open; source msha-controller-operator-history