# Relationship history for MSHA mine 2400785

Current hierarchy: **CRH PLC → Montana Mtls & Cons → HSG Portable Screen Plant #2**

- 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:** Big Sky Ready Mix → HSG Portable Screen Plant #2; 1950-01-01 to 1986-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Max  Dana  et al → HSG Portable Screen Plant #2; 1950-01-01 to 1986-04-30; source msha-controller-operator-history
- **controller_controls_operator:** Max  Dana  et al → Big Sky Ready Mix; 1950-01-01 to 1986-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Big Sky Ready Mix Inc → HSG Portable Screen Plant #2; 1986-05-01 to 2000-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Bruce G  Wood → HSG Portable Screen Plant #2; 1986-05-01 to 2000-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Bruce G  Wood → Big Sky Ready Mix Inc; 1986-05-01 to 2000-09-30; source msha-controller-operator-history
- **operator_operates_mine:** Big Sky Ready Mix Llc → HSG Portable Screen Plant #2; 2000-10-01 to 2009-01-21; source msha-controller-operator-history
- **controller_controls_mine:** Richard J  Maronick  et al → HSG Portable Screen Plant #2; 2000-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard J  Maronick  et al → Big Sky Ready Mix Llc; 2000-10-01 to 2009-01-21; source msha-controller-operator-history
- **controller_controls_operator:** Edward M  Maronick  et al → Big Sky Ready Mix Llc; 2000-10-01 to 2009-01-21; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → HSG Portable Screen Plant #2; 2002-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Montana Mtls & Cons → HSG Portable Screen Plant #2; 2009-01-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Montana Mtls & Cons; 2009-01-22 to current/open; source msha-controller-operator-history