# Relationship history for MSHA mine 4300586

Current hierarchy: **Jason W  Blackburn; Heath P  Blackburn → BLACK RIVER QUARRIES LLC → QUIMBY MTN STONE/BLACK RIVER 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** C. KENYON CONSTRUCTION → QUIMBY MTN STONE/BLACK RIVER QUARRIES; 2002-11-05 to 2010-10-15; source msha-controller-operator-history
- **controller_controls_mine:** Shirley  Kenyon et al → QUIMBY MTN STONE/BLACK RIVER QUARRIES; 2002-11-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Shirley  Kenyon et al → C. KENYON CONSTRUCTION; 2002-11-05 to 2010-10-15; source msha-controller-operator-history
- **controller_controls_operator:** Theodore  Kenyon et al → C. KENYON CONSTRUCTION; 2002-11-05 to 2010-10-15; source msha-controller-operator-history
- **operator_operates_mine:** C Kenyon Construction Inc. → QUIMBY MTN STONE/BLACK RIVER QUARRIES; 2010-10-16 to 2019-08-28; source msha-controller-operator-history
- **controller_controls_mine:** Theodore J  Kenyon → QUIMBY MTN STONE/BLACK RIVER QUARRIES; 2010-10-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Theodore J  Kenyon → C Kenyon Construction Inc.; 2010-10-16 to 2019-08-28; source msha-controller-operator-history
- **operator_operates_mine:** Black River Quarries LLC → QUIMBY MTN STONE/BLACK RIVER QUARRIES; 2019-08-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Heath P  Blackburn et al → QUIMBY MTN STONE/BLACK RIVER QUARRIES; 2019-08-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Heath P  Blackburn et al → Black River Quarries LLC; 2019-08-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jason W  Blackburn et al → Black River Quarries LLC; 2019-08-29 to current/open; source msha-controller-operator-history