# Relationship history for MSHA mine 0901185

Current hierarchy: **Platinum Equity LLC → Imerys Minerals USA, Inc. → Brunswick 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

- **controller_controls_mine:** Alleghany Corp → Brunswick Plant; 1992-11-16 to 2005-07-14; source msha-controller-operator-history
- **controller_controls_mine:** Imerys S A → Brunswick Plant; 2005-07-15 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** S & B Industrial Minerals N A Inc → Brunswick Plant; 2008-01-01 to 2015-02-25; source msha-controller-operator-history
- **controller_controls_mine:** S & B Industrial Minerals S A → Brunswick Plant; 2008-01-01 to 2015-02-25; source msha-controller-operator-history
- **controller_controls_operator:** S & B Industrial Minerals S A → S & B Industrial Minerals N A Inc; 2008-01-01 to 2015-02-25; source msha-controller-operator-history
- **operator_operates_mine:** Imerys Perlite USA Inc. → Brunswick Plant; 2015-02-26 to 2017-01-31; source msha-controller-operator-history
- **controller_controls_operator:** Alleghany Corp → Imerys Perlite USA Inc.; 2015-02-26 to 2005-07-14; source msha-controller-operator-history
- **controller_controls_operator:** Imerys S A → Imerys Perlite USA Inc.; 2015-02-26 to 2017-01-31; source msha-controller-operator-history
- **controller_controls_mine:** Imerys S A → Brunswick Plant; 2015-02-26 to 2023-09-10; source msha-controller-operator-history
- **controller_controls_operator:** Imerys S A → S & B Industrial Minerals N A Inc; 2015-02-26 to 2015-02-25; source msha-controller-operator-history
- **operator_operates_mine:** Imerys Minerals USA, Inc. → Brunswick Plant; 2017-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** S & B Industrial Minerals S A → Imerys Minerals USA, Inc.; 2017-02-01 to 2015-02-25; source msha-controller-operator-history
- **controller_controls_operator:** Imerys S A → Imerys Minerals USA, Inc.; 2017-02-01 to 2023-09-10; source msha-controller-operator-history
- **controller_controls_mine:** Platinum Equity LLC → Brunswick Plant; 2023-09-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Platinum Equity LLC → S & B Industrial Minerals N A Inc; 2023-09-11 to 2015-02-25; source msha-controller-operator-history
- **controller_controls_operator:** Platinum Equity LLC → Imerys Minerals USA, Inc.; 2023-09-11 to current/open; source msha-controller-operator-history