# Relationship history for MSHA mine 4100076

Current hierarchy: **Martin Marietta Materials Inc → Hanson Aggregates → CHICO 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:** Trinity Metroplex Div-General Portland Inc → CHICO QUARRY; 1950-01-01 to 1981-11-11; source msha-controller-operator-history
- **controller_controls_mine:** General Portland Inc → CHICO QUARRY; 1950-01-01 to 1981-11-11; source msha-controller-operator-history
- **controller_controls_operator:** General Portland Inc → Trinity Metroplex Div-General Portland Inc; 1950-01-01 to 1981-11-11; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → CHICO QUARRY; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Lafarge Corp → CHICO QUARRY; 1981-11-12 to 1989-08-31; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Lafarge Corp; 1981-11-12 to 1989-08-31; source msha-controller-operator-history
- **controller_controls_mine:** Pioneer International Ltd → CHICO QUARRY; 1984-08-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hanson PLC → CHICO QUARRY; 1988-11-14 to 2007-08-22; source msha-controller-operator-history
- **operator_operates_mine:** Chico Crushed Stone Partnership → CHICO QUARRY; 1989-09-01 to 1995-01-31; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge Corp et al → CHICO QUARRY; 1989-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge Corp et al → Chico Crushed Stone Partnership; 1989-09-01 to 1995-01-31; source msha-controller-operator-history
- **controller_controls_operator:** Pioneer International Ltd  et al → Chico Crushed Stone Partnership; 1989-09-01 to 1995-01-31; source msha-controller-operator-history
- **operator_operates_mine:** Pioneer South Central Inc → CHICO QUARRY; 1995-02-01 to 2000-08-03; source msha-controller-operator-history
- **controller_controls_operator:** Pioneer International Ltd → Pioneer South Central Inc; 1995-02-01 to 2000-08-03; source msha-controller-operator-history
- **operator_operates_mine:** Hanson Aggregates Central Inc → CHICO QUARRY; 2000-08-04 to 2004-05-09; source msha-controller-operator-history
- **controller_controls_mine:** Hanson PLC → CHICO QUARRY; 2000-08-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Hanson Aggregates Central Inc; 2000-08-04 to 2004-05-09; source msha-controller-operator-history
- **operator_operates_mine:** Hanson Aggregates → CHICO QUARRY; 2004-05-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Hanson Aggregates; 2004-05-10 to 2007-08-22; source msha-controller-operator-history
- **controller_controls_mine:** Heidelberg Materials AG → CHICO QUARRY; 2007-08-23 to 2021-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Heidelberg Materials AG → Hanson Aggregates; 2007-08-23 to 2021-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Martin Marietta Materials Inc → CHICO QUARRY; 2021-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Hanson Aggregates; 2021-10-01 to current/open; source msha-controller-operator-history