# Relationship history for MSHA mine 3101989

Current hierarchy: **Smith-Rowe, LLC → Slate Sand Mining, LLC → Slate Sand**

- 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:** Slate Sand Company → Slate Sand; 1985-10-01 to 2014-09-15; source msha-controller-operator-history
- **controller_controls_mine:** Cecil C  Slate → Slate Sand; 1985-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cecil C  Slate → Slate Sand Company; 1985-10-01 to 2014-09-15; source msha-controller-operator-history
- **operator_operates_mine:** Slate Sand Company Inc → Slate Sand; 2014-09-16 to 2020-09-27; source msha-controller-operator-history
- **controller_controls_mine:** Charles W  Turney et al → Slate Sand; 2014-09-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Charles W  Turney et al → Slate Sand Company Inc; 2014-09-16 to 2020-09-27; source msha-controller-operator-history
- **controller_controls_operator:** Peggy S  Joyce et al → Slate Sand Company Inc; 2014-09-16 to 2020-09-27; source msha-controller-operator-history
- **operator_operates_mine:** Slate Sand Mining, LLC → Slate Sand; 2020-09-28 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Smith-Rowe, LLC → Slate Sand; 2020-09-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Smith-Rowe, LLC → Slate Sand Mining, LLC; 2020-09-28 to current/open; source msha-controller-operator-history