# Relationship history for MSHA mine 1102403

Current hierarchy: **Oil Dri Corporation Of America → Mounds Production Company LLC → LeFevre-Mager Mine**

- 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

- **controller_controls_mine:** Amcol International Corp → LeFevre-Mager Mine; 1950-01-01 to 2014-07-30; source msha-controller-operator-history
- **operator_operates_mine:** Absorbent Clay Products Inc → LeFevre-Mager Mine; 1950-01-01 to 1988-11-14; source msha-controller-operator-history
- **controller_controls_mine:** Bishop  Burd → LeFevre-Mager Mine; 1950-01-01 to 1988-11-14; source msha-controller-operator-history
- **controller_controls_operator:** Bishop  Burd → Absorbent Clay Products Inc; 1950-01-01 to 1988-11-14; source msha-controller-operator-history
- **operator_operates_mine:** American Colloid Company Minerals Group → LeFevre-Mager Mine; 1988-11-15 to 1998-04-19; source msha-controller-operator-history
- **controller_controls_operator:** Amcol International Corp → American Colloid Company Minerals Group; 1988-11-15 to 1998-04-19; source msha-controller-operator-history
- **operator_operates_mine:** Mounds Production Company LLC → LeFevre-Mager Mine; 1998-04-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Oil Dri Corporation Of America → LeFevre-Mager Mine; 1998-04-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Oil Dri Corporation Of America → Mounds Production Company LLC; 1998-04-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Minerals Technologies Inc → LeFevre-Mager Mine; 2014-07-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Minerals Technologies Inc → American Colloid Company Minerals Group; 2014-07-31 to 1998-04-19; source msha-controller-operator-history