# Relationship history for MSHA mine 1518634

Current hierarchy: **Danny L  Ashby; William E  Lucas → North Hopkins Construction and Mining LLC → Chelsea #1 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:** North Hopkins Construction and Mining LLC → Chelsea #1 Mine; 2003-05-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** William E  Lucas et al → Chelsea #1 Mine; 2003-05-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William E  Lucas et al → North Hopkins Construction and Mining LLC; 2003-05-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Danny L  Ashby et al → North Hopkins Construction and Mining LLC; 2003-05-09 to current/open; source msha-controller-operator-history