# Relationship history for MSHA mine 4405101

Current hierarchy: **Ned  Gumble → Virginia Vermiculite LLC → R. E. SANSOM MINE & MILL**

- 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:** Virginia Vermiculite LLC → R. E. SANSOM MINE & MILL; 1978-03-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robert  Sansom → R. E. SANSOM MINE & MILL; 1978-03-09 to 2009-02-11; source msha-controller-operator-history
- **controller_controls_operator:** Robert  Sansom → Virginia Vermiculite LLC; 1978-03-09 to 2009-02-11; source msha-controller-operator-history
- **controller_controls_mine:** Ned  Gumble et al → R. E. SANSOM MINE & MILL; 2009-02-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ned  Gumble et al → Virginia Vermiculite LLC; 2009-02-12 to current/open; source msha-controller-operator-history