# Relationship history for MSHA mine 4100851

Current hierarchy: **Koch Industries Inc → Georgia-Pacific Gypsum LLC → Sweetwater Quarry**

- 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:** Georgia Pacific Corp → Sweetwater Quarry; 1950-01-01 to 2005-12-22; source msha-controller-operator-history
- **operator_operates_mine:** Flintkote Company → Sweetwater Quarry; 1950-01-01 to 1980-04-06; source msha-controller-operator-history
- **controller_controls_mine:** Flintkote Company → Sweetwater Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Flintkote Company → Flintkote Company; 1950-01-01 to 1980-04-06; source msha-controller-operator-history
- **operator_operates_mine:** Genstar Building Materials Company → Sweetwater Quarry; 1980-04-07 to 1987-02-28; source msha-controller-operator-history
- **controller_controls_mine:** Cimenteries Cbr Cementbedrijven → Sweetwater Quarry; 1980-04-07 to 1987-02-28; source msha-controller-operator-history
- **controller_controls_operator:** Cimenteries Cbr Cementbedrijven → Genstar Building Materials Company; 1980-04-07 to 1987-02-28; source msha-controller-operator-history
- **controller_controls_mine:** Domtar Inc → Sweetwater Quarry; 1983-10-31 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Domtar Gypsum Inc → Sweetwater Quarry; 1987-03-01 to 1996-04-15; source msha-controller-operator-history
- **controller_controls_operator:** Domtar Inc → Domtar Gypsum Inc; 1987-03-01 to 1996-04-15; source msha-controller-operator-history
- **operator_operates_mine:** Georgia Pacific Corp → Sweetwater Quarry; 1996-04-16 to 2006-12-30; source msha-controller-operator-history
- **controller_controls_operator:** Georgia Pacific Corp → Georgia Pacific Corp; 1996-04-16 to 2005-12-22; source msha-controller-operator-history
- **controller_controls_mine:** Koch Industries Inc → Sweetwater Quarry; 2005-12-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Koch Industries Inc → Georgia Pacific Corp; 2005-12-23 to 2006-12-30; source msha-controller-operator-history
- **operator_operates_mine:** Georgia-Pacific Gypsum LLC → Sweetwater Quarry; 2006-12-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Koch Industries Inc → Sweetwater Quarry; 2006-12-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Koch Industries Inc → Georgia-Pacific Gypsum LLC; 2006-12-31 to current/open; source msha-controller-operator-history