# Relationship history for MSHA mine 2402232

Current hierarchy: **Christopher  Nudd; Sid  Whittaker → K2 Stone (Montana) LLC → Elk Ridge**

- 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:** Ron Stanton Stone Supply → Elk Ridge; 2001-09-01 to 2010-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Ronald R  Stanton → Elk Ridge; 2001-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ronald R  Stanton → Ron Stanton Stone Supply; 2001-09-01 to 2010-12-31; source msha-controller-operator-history
- **operator_operates_mine:** K2 Stone (Montana) LLC → Elk Ridge; 2011-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Christopher  Nudd  et al → Elk Ridge; 2011-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Christopher  Nudd  et al → K2 Stone (Montana) LLC; 2011-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sid  Whittaker et al → K2 Stone (Montana) LLC; 2011-01-01 to current/open; source msha-controller-operator-history