# Relationship history for MSHA mine 1001993

Current hierarchy: **United States Antimony Corp → Bear River Zeolite Company → Bear River Zeolite Company**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** John C  Lawrence et al → Bear River Zeolite Company; 1950-01-01 to 2003-06-10; source msha-controller-operator-history
- **operator_operates_mine:** United States Antimony Corp → Bear River Zeolite Company; 2000-12-01 to 2003-06-10; source msha-controller-operator-history
- **controller_controls_operator:** John C  Lawrence et al → United States Antimony Corp; 2000-12-01 to 2003-06-10; source msha-controller-operator-history
- **operator_operates_mine:** Bear River Zeolite Company → Bear River Zeolite Company; 2003-06-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John C  Lawrence et al → Bear River Zeolite Company; 2003-06-11 to 2020-11-03; source msha-controller-operator-history
- **controller_controls_operator:** John C  Lawrence et al → Bear River Zeolite Company; 2003-06-11 to 2020-11-03; source msha-controller-operator-history
- **controller_controls_mine:** Russell C  Lawrence et al → Bear River Zeolite Company; 2020-11-04 to 2023-07-14; source msha-controller-operator-history
- **controller_controls_operator:** Russell C  Lawrence et al → Bear River Zeolite Company; 2020-11-04 to 2023-07-14; source msha-controller-operator-history
- **controller_controls_operator:** John  Gustavsen et al → Bear River Zeolite Company; 2020-11-04 to 2023-07-14; source msha-controller-operator-history
- **controller_controls_mine:** United States Antimony Corp et al → Bear River Zeolite Company; 2023-07-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** United States Antimony Corp et al → Bear River Zeolite Company; 2023-07-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** State Street Corporation et al → Bear River Zeolite Company; 2026-02-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** State Street Corporation et al → United States Antimony Corp; 2026-02-05 to 2003-06-10; source msha-controller-operator-history