# Relationship history for MSHA mine 1518469

Current hierarchy: **John T  Quintrell → Smoky Quartz → UZ**

- 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:** Michael K  Cook et al → UZ; 2000-11-10 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Cook and Sons Mining, Inc. → UZ; 2001-10-25 to 2004-04-25; source msha-controller-operator-history
- **controller_controls_operator:** Michael K  Cook et al → Cook and Sons Mining, Inc.; 2001-10-25 to 2004-04-25; source msha-controller-operator-history
- **controller_controls_operator:** Randy A  Cook et al → Cook and Sons Mining, Inc.; 2001-10-25 to 2004-04-25; source msha-controller-operator-history
- **operator_operates_mine:** Coal Extraction LLC → UZ; 2004-04-26 to 2004-11-14; source msha-controller-operator-history
- **controller_controls_mine:** Kenneth L  Stacy → UZ; 2004-04-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kenneth L  Stacy → Coal Extraction LLC; 2004-04-26 to 2004-11-14; source msha-controller-operator-history
- **operator_operates_mine:** Sapphire Coal Company → UZ; 2004-11-15 to 2021-08-05; source msha-controller-operator-history
- **controller_controls_mine:** United  Company → UZ; 2004-11-15 to 2009-04-29; source msha-controller-operator-history
- **controller_controls_operator:** United  Company → Sapphire Coal Company; 2004-11-15 to 2009-04-29; source msha-controller-operator-history
- **controller_controls_mine:** Metinvest B V → UZ; 2009-04-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Metinvest B V → Sapphire Coal Company; 2009-04-30 to 2021-08-05; source msha-controller-operator-history
- **controller_controls_mine:** John T  Quintrell → UZ; 2021-07-30 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Smoky Quartz → UZ; 2021-08-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John T  Quintrell → Smoky Quartz; 2021-08-06 to current/open; source msha-controller-operator-history