# Relationship history for MSHA mine 2601043

Current hierarchy: **Martin Marietta Materials Inc → Martin Marietta Materials, Inc. → Amargosa Quarry and Plant**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Martin Marietta Materials Inc → Amargosa Quarry and Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Industrial Mineral Ventures Inc → Amargosa Quarry and Plant; 1950-01-01 to 1989-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Gulf USA Corp → Amargosa Quarry and Plant; 1950-01-01 to 1989-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Gulf USA Corp → Industrial Mineral Ventures Inc; 1950-01-01 to 1989-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Chemical Lime Company → Amargosa Quarry and Plant; 1986-12-04 to 1998-12-30; source msha-controller-operator-history
- **operator_operates_mine:** Imv-Div/Floridin Company → Amargosa Quarry and Plant; 1989-10-01 to 1997-04-05; source msha-controller-operator-history
- **controller_controls_mine:** Rio Tinto Group → Amargosa Quarry and Plant; 1989-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rio Tinto Group → Imv-Div/Floridin Company; 1989-10-01 to 1997-04-05; source msha-controller-operator-history
- **operator_operates_mine:** IMV Nevada → Amargosa Quarry and Plant; 1997-04-06 to 2013-01-07; source msha-controller-operator-history
- **controller_controls_mine:** Bonnie L  Wahl → Amargosa Quarry and Plant; 1997-04-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bonnie L  Wahl → IMV Nevada; 1997-04-06 to 2013-01-07; source msha-controller-operator-history
- **controller_controls_mine:** Lhoist Group → Amargosa Quarry and Plant; 1998-12-31 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Lhoist North America of Arizona Inc → Amargosa Quarry and Plant; 2013-01-08 to 2026-08-23; source msha-controller-operator-history
- **controller_controls_operator:** Lhoist Group → Lhoist North America of Arizona Inc; 2013-01-08 to 2026-08-23; source msha-controller-operator-history
- **controller_controls_operator:** Chemical Lime Company → Lhoist North America of Arizona Inc; 2013-01-08 to 1998-12-30; source msha-controller-operator-history
- **operator_operates_mine:** Martin Marietta Materials, Inc. → Amargosa Quarry and Plant; 2026-08-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Martin Marietta Materials, Inc.; 2026-08-24 to current/open; source msha-controller-operator-history