# Relationship history for MSHA mine 1200624

Current hierarchy: **The Heritage Group → Heritage Aggregates, LLC → U.S. Aggregates-Bass Lake Sand & Gravel**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **controller_controls_mine:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → U.S. Aggregates-Bass Lake Sand & Gravel; 1950-01-01 to 2007-11-15; source msha-controller-operator-history
- **operator_operates_mine:** Medusa Aggregates Company → U.S. Aggregates-Bass Lake Sand & Gravel; 1950-01-01 to 1978-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Medusa Corp → U.S. Aggregates-Bass Lake Sand & Gravel; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Medusa Corp → Medusa Aggregates Company; 1950-01-01 to 1978-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Crane Company → U.S. Aggregates-Bass Lake Sand & Gravel; 1978-12-13 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Medusa Aggregates Company → U.S. Aggregates-Bass Lake Sand & Gravel; 1979-01-01 to 1981-06-29; source msha-controller-operator-history
- **controller_controls_operator:** Crane Company → Medusa Aggregates Company; 1979-01-01 to 1981-06-29; source msha-controller-operator-history
- **operator_operates_mine:** Bass Lake Sand & Gravel → U.S. Aggregates-Bass Lake Sand & Gravel; 1981-06-30 to 1992-07-21; source msha-controller-operator-history
- **controller_controls_mine:** Thomas  Kaminski → U.S. Aggregates-Bass Lake Sand & Gravel; 1981-06-30 to 1992-07-21; source msha-controller-operator-history
- **controller_controls_operator:** Thomas  Kaminski → Bass Lake Sand & Gravel; 1981-06-30 to 1992-07-21; source msha-controller-operator-history
- **controller_controls_mine:** Jean A  Critser et al → U.S. Aggregates-Bass Lake Sand & Gravel; 1987-09-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** The Heritage Group → U.S. Aggregates-Bass Lake Sand & Gravel; 1989-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Critser Companies Inc → U.S. Aggregates-Bass Lake Sand & Gravel; 1992-07-22 to 2005-08-07; source msha-controller-operator-history
- **controller_controls_operator:** Jean A  Critser et al → Critser Companies Inc; 1992-07-22 to 2005-08-07; source msha-controller-operator-history
- **controller_controls_operator:** William J  Critser et al → Critser Companies Inc; 1992-07-22 to 2005-08-07; source msha-controller-operator-history
- **operator_operates_mine:** Vulcan Construction Materials LP → U.S. Aggregates-Bass Lake Sand & Gravel; 2005-08-08 to 2011-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → Vulcan Construction Materials LP; 2005-08-08 to 2007-11-15; source msha-controller-operator-history
- **controller_controls_mine:** Vulcan Materials Company → U.S. Aggregates-Bass Lake Sand & Gravel; 2007-11-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vulcan Materials Company → Vulcan Construction Materials LP; 2007-11-16 to 2011-09-30; source msha-controller-operator-history
- **operator_operates_mine:** Heritage Aggregates, LLC → U.S. Aggregates-Bass Lake Sand & Gravel; 2011-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** The Heritage Group → Heritage Aggregates, LLC; 2011-10-01 to current/open; source msha-controller-operator-history