# Relationship history for MSHA mine 1102580

Current hierarchy: **Burks James L → Southern Illinois Mineral Corp → Blue Blaze Prep Plant**

- 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:** Blue Blaze Coal Company Inc → Blue Blaze Prep Plant; 1976-12-01 to 1977-05-17; source msha-controller-operator-history
- **controller_controls_mine:** Dyer Robert → Blue Blaze Prep Plant; 1976-12-01 to 1977-05-17; source msha-controller-operator-history
- **controller_controls_operator:** Dyer Robert → Blue Blaze Coal Company Inc; 1976-12-01 to 1977-05-17; source msha-controller-operator-history
- **controller_controls_mine:** Burks James L → Blue Blaze Prep Plant; 1977-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Southern Illinois Mineral Corp → Blue Blaze Prep Plant; 1977-05-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Burks James L → Southern Illinois Mineral Corp; 1977-05-18 to current/open; source msha-controller-operator-history