# Relationship history for MSHA mine 2902010

Current hierarchy: **Gibbens Robert → Alternative Resource Corp → PENA BLANCA 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:** Alternative Resource Corp → PENA BLANCA PIT; 1985-12-01 to 1989-04-16; source msha-controller-operator-history
- **controller_controls_mine:** Gibbens Robert → PENA BLANCA PIT; 1985-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gibbens Robert → Alternative Resource Corp; 1985-12-01 to 1989-04-16; source msha-controller-operator-history
- **operator_operates_mine:** J P Excavation & Trucking → PENA BLANCA PIT; 1989-04-17 to 1989-07-31; source msha-controller-operator-history
- **controller_controls_mine:** Gonzales Joe P → PENA BLANCA PIT; 1989-04-17 to 1989-07-31; source msha-controller-operator-history
- **controller_controls_operator:** Gonzales Joe P → J P Excavation & Trucking; 1989-04-17 to 1989-07-31; source msha-controller-operator-history
- **operator_operates_mine:** Alternative Resource Corp → PENA BLANCA PIT; 1989-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gibbens Robert → Alternative Resource Corp; 1989-08-01 to current/open; source msha-controller-operator-history