# Relationship history for MSHA mine 3503659

Current hierarchy: **Ridgely H  Gilmour; Mark A  Gilmour → Gilmour and Company → Rivergate**

- 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:** Graymont Ltd → Rivergate; 1989-06-26 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Gilmour and Company → Rivergate; 2007-01-24 to 2008-02-27; source msha-controller-operator-history
- **controller_controls_mine:** Ridgely H  Gilmour et al → Rivergate; 2007-01-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ridgely H  Gilmour et al → Gilmour and Company; 2007-01-24 to 2008-02-27; source msha-controller-operator-history
- **controller_controls_operator:** Mark A  Gilmour et al → Gilmour and Company; 2007-01-24 to 2008-02-27; source msha-controller-operator-history
- **operator_operates_mine:** Graymont Western US Inc → Rivergate; 2008-02-28 to 2009-08-24; source msha-controller-operator-history
- **controller_controls_operator:** Graymont Ltd → Graymont Western US Inc; 2008-02-28 to 2009-08-24; source msha-controller-operator-history
- **operator_operates_mine:** Gilmour and Company → Rivergate; 2009-08-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ridgely H  Gilmour et al → Gilmour and Company; 2009-08-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mark A  Gilmour et al → Gilmour and Company; 2009-08-25 to current/open; source msha-controller-operator-history