# Relationship history for MSHA mine 1512914

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

- **operator_operates_mine:** Appalachian Permit Company → Sapphire Prep Plant; 1981-06-01 to 1989-07-20; source msha-controller-operator-history
- **controller_controls_mine:** Reading & Bates Corp → Sapphire Prep Plant; 1981-06-01 to 1989-07-20; source msha-controller-operator-history
- **controller_controls_operator:** Reading & Bates Corp → Appalachian Permit Company; 1981-06-01 to 1989-07-20; source msha-controller-operator-history
- **operator_operates_mine:** Golden Oak Mining Company L P → Sapphire Prep Plant; 1989-07-21 to 2000-11-09; source msha-controller-operator-history
- **controller_controls_mine:** First Capital Corp of Chicago  et al → Sapphire Prep Plant; 1989-07-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** First Capital Corp of Chicago  et al → Golden Oak Mining Company L P; 1989-07-21 to 2000-11-09; source msha-controller-operator-history
- **controller_controls_operator:** GOM Management Inc et al → Golden Oak Mining Company L P; 1989-07-21 to 2000-11-09; source msha-controller-operator-history
- **operator_operates_mine:** Cook & Sons Mining Inc → Sapphire Prep Plant; 2000-11-10 to 2004-04-25; source msha-controller-operator-history
- **controller_controls_mine:** Randy A  Cook et al → Sapphire Prep Plant; 2000-11-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Randy A  Cook et al → Cook & Sons Mining Inc; 2000-11-10 to 2004-04-25; source msha-controller-operator-history
- **controller_controls_operator:** Michael K  Cook et al → Cook & Sons Mining Inc; 2000-11-10 to 2004-04-25; source msha-controller-operator-history
- **operator_operates_mine:** Coal Extraction LLC → Sapphire Prep Plant; 2004-04-26 to 2004-11-14; source msha-controller-operator-history
- **controller_controls_mine:** Kenneth L  Stacy → Sapphire Prep Plant; 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 → Sapphire Prep Plant; 2004-11-15 to 2021-07-29; source msha-controller-operator-history
- **controller_controls_mine:** United  Company → Sapphire Prep Plant; 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 → Sapphire Prep Plant; 2009-04-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Metinvest B V → Sapphire Coal Company; 2009-04-30 to 2021-07-29; source msha-controller-operator-history
- **operator_operates_mine:** Smoky Quartz → Sapphire Prep Plant; 2021-07-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John T  Quintrell → Sapphire Prep Plant; 2021-07-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John T  Quintrell → Smoky Quartz; 2021-07-30 to current/open; source msha-controller-operator-history