# Relationship history for MSHA mine 0405361

Current hierarchy: **Clearwater Environmental Inc; Copper Enterprises Inc → Copper Rock Jv → COPPER ROCK SAN ANDREAS 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

- **operator_operates_mine:** Copper Rock Jv → COPPER ROCK SAN ANDREAS PIT; 1999-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Clearwater Environmental Inc et al → COPPER ROCK SAN ANDREAS PIT; 1999-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Clearwater Environmental Inc et al → Copper Rock Jv; 1999-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Copper Enterprises Inc  et al → Copper Rock Jv; 1999-03-01 to current/open; source msha-controller-operator-history