# Relationship history for MSHA mine 0801254

Current hierarchy: **Cemex S A → RMC Florida Group LTD → Estero Quarry**

- 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:** Youngquist Brothers Rock → Estero Quarry; 1997-06-01 to 1999-08-06; source msha-controller-operator-history
- **controller_controls_mine:** Harvey  Youngquist et al → Estero Quarry; 1997-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harvey  Youngquist et al → Youngquist Brothers Rock; 1997-06-01 to 1999-08-06; source msha-controller-operator-history
- **controller_controls_operator:** Tim G  Youngquist et al → Youngquist Brothers Rock; 1997-06-01 to 1999-08-06; source msha-controller-operator-history
- **operator_operates_mine:** RMC South Florida Materials → Estero Quarry; 1999-08-07 to 2003-01-12; source msha-controller-operator-history
- **controller_controls_mine:** RMC Group PLC → Estero Quarry; 1999-08-07 to 2005-02-28; source msha-controller-operator-history
- **controller_controls_operator:** RMC Group PLC → RMC South Florida Materials; 1999-08-07 to 2003-01-12; source msha-controller-operator-history
- **controller_controls_mine:** RMC Group PLC → Estero Quarry; 1999-10-16 to 2005-02-28; source msha-controller-operator-history
- **operator_operates_mine:** RMC South Florida Inc → Estero Quarry; 2003-01-13 to 2003-03-05; source msha-controller-operator-history
- **controller_controls_operator:** RMC Group PLC → RMC South Florida Inc; 2003-01-13 to 2003-03-05; source msha-controller-operator-history
- **operator_operates_mine:** RMC South Florida Materials, Inc. → Estero Quarry; 2003-03-06 to 2005-12-31; source msha-controller-operator-history
- **controller_controls_operator:** RMC Group PLC → RMC South Florida Materials, Inc.; 2003-03-06 to 2005-02-28; source msha-controller-operator-history
- **controller_controls_mine:** Cemex S A → Estero Quarry; 2005-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cemex S A → RMC South Florida Materials; 2005-03-01 to 2003-01-12; source msha-controller-operator-history
- **controller_controls_operator:** Cemex S A → RMC South Florida Inc; 2005-03-01 to 2003-03-05; source msha-controller-operator-history
- **controller_controls_operator:** Cemex S A → RMC South Florida Materials, Inc.; 2005-03-01 to 2005-12-31; source msha-controller-operator-history
- **operator_operates_mine:** RMC Florida Group LTD → Estero Quarry; 2006-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cemex S A → Estero Quarry; 2006-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cemex S A → RMC Florida Group LTD; 2006-01-01 to current/open; source msha-controller-operator-history