# Relationship history for MSHA mine 1302000

Current hierarchy: **Riverstone Group → Wecc Corp → Mc Causland Quarry #2**

- 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:** Wecc Corp → Mc Causland Quarry #2; 1983-04-01 to 1987-05-03; source msha-controller-operator-history
- **controller_controls_mine:** B W  Carpenter  et al → Mc Causland Quarry #2; 1983-04-01 to 1987-05-03; source msha-controller-operator-history
- **controller_controls_operator:** B W  Carpenter  et al → Wecc Corp; 1983-04-01 to 1987-05-03; source msha-controller-operator-history
- **operator_operates_mine:** Wecc Corp → Mc Causland Quarry #2; 1987-05-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Riverstone Group → Mc Causland Quarry #2; 1987-05-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Riverstone Group → Wecc Corp; 1987-05-04 to current/open; source msha-controller-operator-history