# Relationship history for MSHA mine 0202320

Current hierarchy: **Salt River Pima-Maricopa Indian Community → Salt River Sand & Rock → Buckeye Plant**

- 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:** Salt River Pima-Maricopa Indian Community → Buckeye Plant; 1981-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Salt River Sand & Rock → Buckeye Plant; 1986-07-01 to 2008-03-19; source msha-controller-operator-history
- **controller_controls_operator:** Salt River Pima-Maricopa Indian Community → Salt River Sand & Rock; 1986-07-01 to 2008-03-19; source msha-controller-operator-history
- **operator_operates_mine:** Salt River Materials Group → Buckeye Plant; 2008-03-20 to 2008-05-05; source msha-controller-operator-history
- **controller_controls_mine:** Salt River Pima-Maricopa Indian Community → Buckeye Plant; 2008-03-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Salt River Pima-Maricopa Indian Community → Salt River Materials Group; 2008-03-20 to 2008-05-05; source msha-controller-operator-history
- **operator_operates_mine:** Salt River Sand & Rock → Buckeye Plant; 2008-05-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Salt River Pima-Maricopa Indian Community → Salt River Sand & Rock; 2008-05-06 to current/open; source msha-controller-operator-history