# Relationship history for MSHA mine 2000040

Current hierarchy: **Great Lakes Aggregates LLC → Sibley Limestone LLC → Sibley Limestone LLC**

- 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:** Michigan Foundation Company Inc → Sibley Limestone LLC; 1950-01-01 to 2001-01-11; source msha-controller-operator-history
- **controller_controls_mine:** J R  Foley Sr → Sibley Limestone LLC; 1950-01-01 to 2001-01-11; source msha-controller-operator-history
- **controller_controls_operator:** J R  Foley Sr → Michigan Foundation Company Inc; 1950-01-01 to 2001-01-11; source msha-controller-operator-history
- **operator_operates_mine:** Sibley Limestone LLC → Sibley Limestone LLC; 2001-01-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Great Lakes Aggregates LLC → Sibley Limestone LLC; 2001-01-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Great Lakes Aggregates LLC → Sibley Limestone LLC; 2001-01-12 to current/open; source msha-controller-operator-history