# Relationship history for MSHA mine 3605468

Current hierarchy: **Cyprus Amax Minerals Company → Emerald Mines Company → Emerald Mines 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

- **controller_controls_mine:** Lykes Resources Inc → Emerald Mines Prep Plant; 1975-01-01 to 1979-08-15; source msha-controller-operator-history
- **operator_operates_mine:** Emerald Mines Corp → Emerald Mines Prep Plant; 1975-03-01 to 1978-12-04; source msha-controller-operator-history
- **controller_controls_operator:** Lykes Resources Inc → Emerald Mines Corp; 1975-03-01 to 1978-12-04; source msha-controller-operator-history
- **operator_operates_mine:** Emerald Mines Corp → Emerald Mines Prep Plant; 1978-12-05 to 1980-06-30; source msha-controller-operator-history
- **controller_controls_mine:** LTV Corporation → Emerald Mines Prep Plant; 1978-12-05 to 1980-06-30; source msha-controller-operator-history
- **controller_controls_operator:** LTV Corporation → Emerald Mines Corp; 1978-12-05 to 1980-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Emerald Mines Company → Emerald Mines Prep Plant; 1980-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cyprus Amax Minerals Company → Emerald Mines Prep Plant; 1980-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cyprus Amax Minerals Company → Emerald Mines Company; 1980-07-01 to current/open; source msha-controller-operator-history