# Relationship history for MSHA mine 0502752

Current hierarchy: **Freeport-McMoRan Inc → Climax Molybdenum Company → Jones 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:** Webster Sand & Gravel Inc → Jones Pit; 1950-01-01 to 2015-06-11; source msha-controller-operator-history
- **controller_controls_mine:** Webster Ellis B → Jones Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Webster Ellis B → Webster Sand & Gravel Inc; 1950-01-01 to 2015-06-11; source msha-controller-operator-history
- **controller_controls_mine:** Phelps Dodge Corp → Jones Pit; 1999-10-22 to 2007-03-18; source msha-controller-operator-history
- **controller_controls_mine:** Freeport-McMoRan Inc → Jones Pit; 2007-03-19 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Climax Molybdenum Company → Jones Pit; 2015-06-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Freeport-McMoRan Inc → Climax Molybdenum Company; 2015-06-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Phelps Dodge Corp → Climax Molybdenum Company; 2015-06-12 to 2007-03-18; source msha-controller-operator-history