# Relationship history for MSHA mine 0504862

Current hierarchy: **Amrize Ltd → Amrize West Central Inc. → Amrize Scout Island**

- 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:** Aggregate Industries PLC → Amrize Scout Island; 1997-05-14 to 2009-04-29; source msha-controller-operator-history
- **operator_operates_mine:** J-2 Contracting Co → Amrize Scout Island; 2007-01-11 to 2023-01-04; source msha-controller-operator-history
- **controller_controls_mine:** John  Leone et al → Amrize Scout Island; 2007-01-11 to 2015-01-07; source msha-controller-operator-history
- **controller_controls_operator:** John  Leone et al → J-2 Contracting Co; 2007-01-11 to 2015-01-07; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Amrize Scout Island; 2009-04-30 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Chris  Leone et al → Amrize Scout Island; 2015-01-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Chris  Leone et al → J-2 Contracting Co; 2015-01-08 to 2023-01-04; source msha-controller-operator-history
- **controller_controls_operator:** Chance  Brown et al → J-2 Contracting Co; 2015-01-08 to 2023-01-04; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Amrize Scout Island; 2015-07-10 to 2025-06-22; source msha-controller-operator-history
- **operator_operates_mine:** Amrize West Central Inc. → Amrize Scout Island; 2023-01-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Amrize West Central Inc.; 2023-01-05 to 2025-06-22; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Amrize West Central Inc.; 2023-01-05 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_operator:** Aggregate Industries PLC → Amrize West Central Inc.; 2023-01-05 to 2009-04-29; source msha-controller-operator-history
- **controller_controls_mine:** Amrize Ltd → Amrize Scout Island; 2025-06-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Amrize Ltd → Amrize West Central Inc.; 2025-06-23 to current/open; source msha-controller-operator-history