# Relationship history for MSHA mine 0203311

Current hierarchy: **JLL Partners Incorporated → Pioneer Landscaping Materials, Inc. → Quartzsite 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

- **controller_controls_mine:** Gary  Schnurr → Quartzsite Pit; 1950-01-01 to 2014-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Pioneer Landscaping Materials, Inc. → Quartzsite Pit; 2012-11-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gary  Schnurr → Pioneer Landscaping Materials, Inc.; 2012-11-30 to 2014-12-31; source msha-controller-operator-history
- **controller_controls_mine:** JLL Partners Incorporated → Quartzsite Pit; 2015-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** JLL Partners Incorporated → Pioneer Landscaping Materials, Inc.; 2015-01-01 to current/open; source msha-controller-operator-history