# Relationship history for MSHA mine 0504494

Current hierarchy: **Mc Kenzie Bay International Ltd (Mkby) → Great Western Diamond Company → KELSEY LAKE**

- 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:** Diamond Company N L → KELSEY LAKE; 1992-07-01 to 1995-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Colorado Diamond Corp Ltd → KELSEY LAKE; 1992-07-01 to 1995-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Colorado Diamond Corp Ltd → Diamond Company N L; 1992-07-01 to 1995-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Diamond Company N L → KELSEY LAKE; 1996-01-01 to 2000-08-14; source msha-controller-operator-history
- **controller_controls_mine:** Redaurum Ltd → KELSEY LAKE; 1996-01-01 to 2000-08-14; source msha-controller-operator-history
- **controller_controls_operator:** Redaurum Ltd → Diamond Company N L; 1996-01-01 to 2000-08-14; source msha-controller-operator-history
- **operator_operates_mine:** Great Western Diamond Company → KELSEY LAKE; 2000-08-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mc Kenzie Bay International Ltd (Mkby) → KELSEY LAKE; 2000-08-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mc Kenzie Bay International Ltd (Mkby) → Great Western Diamond Company; 2000-08-15 to current/open; source msha-controller-operator-history