# Relationship history for MSHA mine 0402098

Current hierarchy: **De Silva Holding Company Inc; Richard B Gates → DeSilva Gates Construction LLC → DeSilva Gates Aggregates**

- 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:** Lone Star Industries Inc → DeSilva Gates Aggregates; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Santa Clara Sand & Gravel Company Inc → DeSilva Gates Aggregates; 1950-01-01 to 1985-10-31; source msha-controller-operator-history
- **controller_controls_mine:** R K  Humphries → DeSilva Gates Aggregates; 1950-01-01 to 1985-10-31; source msha-controller-operator-history
- **controller_controls_operator:** R K  Humphries → Santa Clara Sand & Gravel Company Inc; 1950-01-01 to 1985-10-31; source msha-controller-operator-history
- **operator_operates_mine:** Lone Star Industries Inc → DeSilva Gates Aggregates; 1985-11-01 to 1987-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Lone Star Industries Inc → Lone Star Industries Inc; 1985-11-01 to 1987-12-31; source msha-controller-operator-history
- **operator_operates_mine:** CEMEX → DeSilva Gates Aggregates; 1988-01-01 to 2006-11-30; source msha-controller-operator-history
- **controller_controls_mine:** RMC Group PLC → DeSilva Gates Aggregates; 1988-01-01 to 2005-02-28; source msha-controller-operator-history
- **controller_controls_operator:** RMC Group PLC → CEMEX; 1988-01-01 to 2005-02-28; source msha-controller-operator-history
- **controller_controls_mine:** Cemex S A → DeSilva Gates Aggregates; 2001-07-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cemex S A → DeSilva Gates Aggregates; 2005-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cemex S A → CEMEX; 2005-03-01 to 2006-11-30; source msha-controller-operator-history
- **controller_controls_mine:** Edwin O  DeSilva et al → DeSilva Gates Aggregates; 2005-09-29 to 2022-05-04; source msha-controller-operator-history
- **operator_operates_mine:** Cemex Construction Materials LP → DeSilva Gates Aggregates; 2006-12-01 to 2011-11-29; source msha-controller-operator-history
- **controller_controls_operator:** Cemex S A → Cemex Construction Materials LP; 2006-12-01 to 2011-11-29; source msha-controller-operator-history
- **operator_operates_mine:** Sunol Aggregates → DeSilva Gates Aggregates; 2011-11-30 to 2015-08-20; source msha-controller-operator-history
- **controller_controls_mine:** DeSilva Holding Co → DeSilva Gates Aggregates; 2011-11-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** DeSilva Holding Co → Sunol Aggregates; 2011-11-30 to 2015-08-20; source msha-controller-operator-history
- **operator_operates_mine:** DeSilva Gates Construction LLC → DeSilva Gates Aggregates; 2015-08-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Edwin O  DeSilva et al → DeSilva Gates Construction LLC; 2015-08-21 to 2022-05-04; source msha-controller-operator-history
- **controller_controls_operator:** Richard B  Gates et al → DeSilva Gates Construction LLC; 2015-08-21 to 2022-05-04; source msha-controller-operator-history
- **controller_controls_mine:** De Silva Holding Company Inc et al → DeSilva Gates Aggregates; 2022-05-05 to 2025-04-10; source msha-controller-operator-history
- **controller_controls_operator:** De Silva Holding Company Inc et al → DeSilva Gates Construction LLC; 2022-05-05 to 2025-04-10; source msha-controller-operator-history
- **controller_controls_operator:** Richard B Gates et al → DeSilva Gates Construction LLC; 2022-05-05 to 2025-04-10; source msha-controller-operator-history
- **controller_controls_mine:** El Portal Real Estate Co et al → DeSilva Gates Aggregates; 2025-04-11 to 2025-12-18; source msha-controller-operator-history
- **controller_controls_operator:** El Portal Real Estate Co et al → DeSilva Gates Construction LLC; 2025-04-11 to 2025-12-18; source msha-controller-operator-history
- **controller_controls_operator:** Oliver DeSilva Inc et al → DeSilva Gates Construction LLC; 2025-04-11 to 2025-12-18; source msha-controller-operator-history
- **controller_controls_mine:** Richard B Gates et al → DeSilva Gates Aggregates; 2025-12-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard B Gates et al → DeSilva Gates Construction LLC; 2025-12-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** De Silva Holding Company Inc et al → DeSilva Gates Construction LLC; 2025-12-19 to current/open; source msha-controller-operator-history