# Relationship history for MSHA mine 4102978

Current hierarchy: **Prince Mineral Company Incorporated → American Minerals Inc → El Paso 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** American Premier Inc → El Paso Plant; 1978-03-09 to 1998-01-28; source msha-controller-operator-history
- **operator_operates_mine:** American Minerals Inc → El Paso Plant; 1980-02-01 to 1998-01-28; source msha-controller-operator-history
- **controller_controls_operator:** American Premier Inc → American Minerals Inc; 1980-02-01 to 1998-01-28; source msha-controller-operator-history
- **controller_controls_mine:** Imerys S A → El Paso Plant; 1997-11-18 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** American Minerals Inc → El Paso Plant; 1998-01-29 to 2006-01-16; source msha-controller-operator-history
- **controller_controls_operator:** Imerys S A → American Minerals Inc; 1998-01-29 to 2006-01-16; source msha-controller-operator-history
- **controller_controls_mine:** Prince Mineral Company Incorporated → El Paso Plant; 2005-03-18 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** American Minerals Inc → El Paso Plant; 2006-01-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Prince Mineral Company Incorporated → American Minerals Inc; 2006-01-17 to current/open; source msha-controller-operator-history