# Relationship history for MSHA mine 1001564

Current hierarchy: **Opta Minerals Co → Emerald Creek Garnet Ltd → Emerald Creek Garnet Ltd**

- 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:** Kurt  Mc Call  et al → Emerald Creek Garnet Ltd; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Emerald Creek Garnet Milling Company Inc → Emerald Creek Garnet Ltd; 1981-10-01 to 1991-11-15; source msha-controller-operator-history
- **controller_controls_operator:** Kurt  Mc Call  et al → Emerald Creek Garnet Milling Company Inc; 1981-10-01 to 1991-11-15; source msha-controller-operator-history
- **operator_operates_mine:** Emerald Creek Garnet Ltd → Emerald Creek Garnet Ltd; 1991-11-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Western Garnet International → Emerald Creek Garnet Ltd; 1991-11-16 to 2012-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Western Garnet International → Emerald Creek Garnet Ltd; 1991-11-16 to 2012-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Opta Minerals Co → Emerald Creek Garnet Ltd; 2013-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Opta Minerals Co → Emerald Creek Garnet Ltd; 2013-01-01 to current/open; source msha-controller-operator-history