# Relationship history for MSHA mine 3100233

Current hierarchy: **RHI Magnesita → Resco Products Inc → Hillsborough Mine**

- 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:** Resco Products Piedmont Minerals Div → Hillsborough Mine; 1950-01-01 to 2002-09-02; source msha-controller-operator-history
- **controller_controls_mine:** Resco Products Inc → Hillsborough Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Resco Products Inc → Resco Products Piedmont Minerals Div; 1950-01-01 to 2002-09-02; source msha-controller-operator-history
- **controller_controls_mine:** Bill K  Brown → Hillsborough Mine; 2000-05-01 to 2012-08-05; source msha-controller-operator-history
- **operator_operates_mine:** Resco Products Inc → Hillsborough Mine; 2002-09-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bill K  Brown → Resco Products Inc; 2002-09-03 to 2012-08-05; source msha-controller-operator-history
- **controller_controls_mine:** John  Midea → Hillsborough Mine; 2012-08-06 to 2014-09-30; source msha-controller-operator-history
- **controller_controls_operator:** John  Midea → Resco Products Inc; 2012-08-06 to 2014-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Wellspring Capital Management LLC → Hillsborough Mine; 2014-10-01 to 2018-01-07; source msha-controller-operator-history
- **controller_controls_operator:** Wellspring Capital Management LLC → Resco Products Inc; 2014-10-01 to 2018-01-07; source msha-controller-operator-history
- **controller_controls_mine:** Thermal Solutions Holdings Inc → Hillsborough Mine; 2018-01-08 to 2022-03-09; source msha-controller-operator-history
- **controller_controls_operator:** Thermal Solutions Holdings Inc → Resco Products Inc; 2018-01-08 to 2022-03-09; source msha-controller-operator-history
- **controller_controls_mine:** Balmoral Funds LLC → Hillsborough Mine; 2022-03-10 to 2025-01-27; source msha-controller-operator-history
- **controller_controls_operator:** Balmoral Funds LLC → Resco Products Inc; 2022-03-10 to 2025-01-27; source msha-controller-operator-history
- **controller_controls_mine:** RHI Magnesita → Hillsborough Mine; 2025-01-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** RHI Magnesita → Resco Products Inc; 2025-01-28 to current/open; source msha-controller-operator-history