# Relationship history for MSHA mine 2901785

Current hierarchy: **Chase Clark Wilson → New Mexico Salt & Minerals LLC → New Mexico Salt & Minerals LLC**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** S P N Dismantling Inc → New Mexico Salt & Minerals LLC; 1979-09-01 to 1983-09-23; source msha-controller-operator-history
- **controller_controls_mine:** Edward N  Siebert → New Mexico Salt & Minerals LLC; 1979-09-01 to 1983-09-23; source msha-controller-operator-history
- **controller_controls_operator:** Edward N  Siebert → S P N Dismantling Inc; 1979-09-01 to 1983-09-23; source msha-controller-operator-history
- **operator_operates_mine:** New Mexico Salt & Minerals LLC → New Mexico Salt & Minerals LLC; 1983-09-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Wesley L  Watts → New Mexico Salt & Minerals LLC; 1983-09-24 to 2014-06-11; source msha-controller-operator-history
- **controller_controls_operator:** Wesley L  Watts → New Mexico Salt & Minerals LLC; 1983-09-24 to 2014-06-11; source msha-controller-operator-history
- **controller_controls_mine:** Chase Clark Wilson → New Mexico Salt & Minerals LLC; 2014-06-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Chase Clark Wilson → New Mexico Salt & Minerals LLC; 2014-06-12 to current/open; source msha-controller-operator-history