# Relationship history for MSHA mine 1700820

Current hierarchy: **Quikrete Holdings Inc. → Monarch Mountain Minerals & Aggregates, LLC → MONARCH MOUNTAIN ACTON**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Turk's Sand & Gravel, Inc. → MONARCH MOUNTAIN ACTON; 2007-07-01 to 2015-07-07; source msha-controller-operator-history
- **controller_controls_mine:** David L  Turcotte → MONARCH MOUNTAIN ACTON; 2007-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David L  Turcotte → Turk's Sand & Gravel, Inc.; 2007-07-01 to 2015-07-07; source msha-controller-operator-history
- **controller_controls_mine:** Quikrete Holdings Inc. → MONARCH MOUNTAIN ACTON; 2012-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Monarch Mountain Minerals & Aggregates, LLC → MONARCH MOUNTAIN ACTON; 2015-07-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Quikrete Holdings Inc. → Monarch Mountain Minerals & Aggregates, LLC; 2015-07-08 to current/open; source msha-controller-operator-history