# Relationship history for MSHA mine 0301815

Current hierarchy: **Darrell E  Hayden → Hayden Gravel Inc. → Sheridan 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Quikrete Holdings Inc. → Sheridan Mine; 1998-09-11 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** White Rock Inc → Sheridan Mine; 1999-10-01 to 2002-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Charles R  Tankersley → Sheridan Mine; 1999-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Charles R  Tankersley → White Rock Inc; 1999-10-01 to 2002-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Custom Aggregates → Sheridan Mine; 2002-04-01 to 2008-09-16; source msha-controller-operator-history
- **controller_controls_mine:** Huey  Stockstill  et al → Sheridan Mine; 2002-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Huey  Stockstill  et al → Custom Aggregates; 2002-04-01 to 2008-09-16; source msha-controller-operator-history
- **controller_controls_operator:** Richard  Stockstill  et al → Custom Aggregates; 2002-04-01 to 2008-09-16; source msha-controller-operator-history
- **operator_operates_mine:** Quikrete Companies, Inc. → Sheridan Mine; 2008-09-17 to 2014-02-11; source msha-controller-operator-history
- **controller_controls_operator:** Quikrete Holdings Inc. → Quikrete Companies, Inc.; 2008-09-17 to 2014-02-11; source msha-controller-operator-history
- **operator_operates_mine:** Hayden Gravel Inc. → Sheridan Mine; 2014-02-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Darrell E  Hayden → Sheridan Mine; 2014-02-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Darrell E  Hayden → Hayden Gravel Inc.; 2014-02-12 to current/open; source msha-controller-operator-history