# Relationship history for MSHA mine 0401878

Current hierarchy: **John  Bremer; Brady  Barto → US Mine Corp → USMC Ione 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Oi Ione Sts Inc → USMC Ione Plant; 1950-01-01 to 2000-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Owens Illinois Inc → USMC Ione Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Owens Illinois Inc → Oi Ione Sts Inc; 1950-01-01 to 2000-06-30; source msha-controller-operator-history
- **controller_controls_mine:** S C R-Sibelco Nv et al → USMC Ione Plant; 1950-01-01 to 2020-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Unimin Corp → USMC Ione Plant; 2000-07-01 to 2015-08-30; source msha-controller-operator-history
- **controller_controls_operator:** S C R-Sibelco Nv et al → Unimin Corp; 2000-07-01 to 2015-08-30; source msha-controller-operator-history
- **controller_controls_mine:** A Scott  Dockter → USMC Ione Plant; 2013-03-04 to 2025-06-17; source msha-controller-operator-history
- **operator_operates_mine:** US Mine Corp → USMC Ione Plant; 2015-08-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** A Scott  Dockter → US Mine Corp; 2015-08-31 to 2025-06-17; source msha-controller-operator-history
- **controller_controls_mine:** Covia Holdings LLC → USMC Ione Plant; 2021-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Covia Holdings LLC → Unimin Corp; 2021-01-01 to 2015-08-30; source msha-controller-operator-history
- **controller_controls_mine:** John  Bremer et al → USMC Ione Plant; 2025-06-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John  Bremer et al → US Mine Corp; 2025-06-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brady  Barto et al → US Mine Corp; 2025-06-18 to current/open; source msha-controller-operator-history