# Relationship history for MSHA mine 3605851

Current hierarchy: **David C  Klementik → Gray Mining Company Inc → Yellow Run Refuse Site**

- 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:** Gray Mining Company Inc → Yellow Run Refuse Site; 1975-11-01 to 1977-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Francis H D → Yellow Run Refuse Site; 1975-11-01 to 1977-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Francis H D → Gray Mining Company Inc; 1975-11-01 to 1977-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Gray Mining Company Inc → Yellow Run Refuse Site; 1977-04-01 to 1994-10-10; source msha-controller-operator-history
- **controller_controls_mine:** Yellow Run Coal Company → Yellow Run Refuse Site; 1977-04-01 to 1994-10-10; source msha-controller-operator-history
- **controller_controls_operator:** Yellow Run Coal Company → Gray Mining Company Inc; 1977-04-01 to 1994-10-10; source msha-controller-operator-history
- **operator_operates_mine:** Gray Mining Company Inc → Yellow Run Refuse Site; 1994-10-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** David C  Klementik  et al → Yellow Run Refuse Site; 1994-10-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David C  Klementik  et al → Gray Mining Company Inc; 1994-10-11 to current/open; source msha-controller-operator-history