# Relationship history for MSHA mine 3000089

Current hierarchy: **Colas S A → Upstone Materials Inc. → PLATTSBURGH QUARRIES**

- 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:** Plattsburgh Quarries → PLATTSBURGH QUARRIES; 1950-01-01 to 2004-06-07; source msha-controller-operator-history
- **controller_controls_mine:** Graymont Ltd → PLATTSBURGH QUARRIES; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Graymont Ltd → Plattsburgh Quarries; 1950-01-01 to 2004-06-07; source msha-controller-operator-history
- **operator_operates_mine:** Graymont Materials (NY) Inc. → PLATTSBURGH QUARRIES; 2004-06-08 to 2017-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Graymont Ltd → PLATTSBURGH QUARRIES; 2004-06-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Graymont Ltd → Graymont Materials (NY) Inc.; 2004-06-08 to 2017-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Upstone Materials Inc. → PLATTSBURGH QUARRIES; 2017-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Colas S A → PLATTSBURGH QUARRIES; 2017-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Colas S A → Upstone Materials Inc.; 2017-06-01 to current/open; source msha-controller-operator-history