# Relationship history for MSHA mine 0201870

Current hierarchy: **Amrize Ltd → Aggregate Industries SWR, Inc. → Sun City Pit**

- 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:** Sun Valley Crushing Company → Sun City Pit; 1950-01-01 to 1986-01-15; source msha-controller-operator-history
- **controller_controls_mine:** William A  Walker → Sun City Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William A  Walker → Sun Valley Crushing Company; 1950-01-01 to 1986-01-15; source msha-controller-operator-history
- **controller_controls_mine:** Garth  Frehner → Sun City Pit; 1983-08-01 to 2004-05-09; source msha-controller-operator-history
- **operator_operates_mine:** Sun State Rock & Materials Corp → Sun City Pit; 1986-01-16 to 2006-10-06; source msha-controller-operator-history
- **controller_controls_mine:** Larry  Walker et al → Sun City Pit; 1986-01-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Larry  Walker et al → Sun State Rock & Materials Corp; 1986-01-16 to 2006-10-06; source msha-controller-operator-history
- **controller_controls_operator:** Deloris C  Walker et al → Sun State Rock & Materials Corp; 1986-01-16 to 2006-10-06; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → Sun City Pit; 2001-07-12 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Aggregate Industries PLC → Sun City Pit; 2004-05-10 to 2009-04-29; source msha-controller-operator-history
- **operator_operates_mine:** Lafarge North America Inc → Sun City Pit; 2006-10-07 to 2018-02-22; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Lafarge North America Inc; 2006-10-07 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Sun City Pit; 2009-04-30 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Sun City Pit; 2015-07-10 to 2025-06-22; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Sun City Pit; 2015-07-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Lafarge North America Inc; 2015-07-10 to 2018-02-22; source msha-controller-operator-history
- **operator_operates_mine:** Aggregate Industries SWR, Inc. → Sun City Pit; 2018-02-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Aggregate Industries SWR, Inc.; 2018-02-23 to 2025-06-22; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Aggregate Industries SWR, Inc.; 2018-02-23 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_operator:** Garth  Frehner → Aggregate Industries SWR, Inc.; 2018-02-23 to 2004-05-09; source msha-controller-operator-history
- **controller_controls_operator:** Aggregate Industries PLC → Aggregate Industries SWR, Inc.; 2018-02-23 to 2009-04-29; source msha-controller-operator-history
- **controller_controls_mine:** Amrize Ltd → Sun City Pit; 2025-06-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Amrize Ltd → Aggregate Industries SWR, Inc.; 2025-06-23 to current/open; source msha-controller-operator-history