# Relationship history for MSHA mine 0200990

Current hierarchy: **Consolidated Gold Fields Limited → Arc Materials Corp-Starr Ready Mix → Starr Ready Mix 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:** Starr Ready Mix → Starr Ready Mix Pit; 1950-01-01 to 1980-02-29; source msha-controller-operator-history
- **controller_controls_mine:** Taggart Construction Company → Starr Ready Mix Pit; 1950-01-01 to 1980-02-29; source msha-controller-operator-history
- **controller_controls_operator:** Taggart Construction Company → Starr Ready Mix; 1950-01-01 to 1980-02-29; source msha-controller-operator-history
- **operator_operates_mine:** Arc Materials Corp-Starr Ready Mix → Starr Ready Mix Pit; 1980-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Consolidated Gold Fields Limited → Starr Ready Mix Pit; 1980-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Consolidated Gold Fields Limited → Arc Materials Corp-Starr Ready Mix; 1980-03-01 to current/open; source msha-controller-operator-history