# Relationship history for MSHA mine 0801286

Current hierarchy: **River Country Land & Cattle LLC → Sand Hill Rock, LLC → Sand Hill Rock**

- 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:** Dickerson Group Inc → Sand Hill Rock; 1979-12-28 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sham Rock & Shell Pit Inc → Sand Hill Rock; 2000-04-01 to 2003-06-09; source msha-controller-operator-history
- **controller_controls_mine:** Harrison  O'Connor → Sand Hill Rock; 2000-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harrison  O'Connor → Sham Rock & Shell Pit Inc; 2000-04-01 to 2003-06-09; source msha-controller-operator-history
- **operator_operates_mine:** Dickerson of Florida Inc → Sand Hill Rock; 2003-06-10 to 2014-08-03; source msha-controller-operator-history
- **controller_controls_operator:** Dickerson Group Inc → Dickerson of Florida Inc; 2003-06-10 to 2014-08-03; source msha-controller-operator-history
- **operator_operates_mine:** Sand Hill Rock, LLC → Sand Hill Rock; 2014-08-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** River Country Land & Cattle LLC et al → Sand Hill Rock; 2014-08-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** River Country Land & Cattle LLC et al → Sand Hill Rock, LLC; 2014-08-04 to current/open; source msha-controller-operator-history