# Relationship history for MSHA mine 0405881

Current hierarchy: **Pei Lien  Lo Hwang; Andrew A  Cheng → Pacific Mining Group, LLC → Mesquite Lake Gypsum 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: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Pacific Mining Group, LLC → Mesquite Lake Gypsum Mine; 2014-08-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Andrew A  Cheng et al → Mesquite Lake Gypsum Mine; 2014-08-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Andrew A  Cheng et al → Pacific Mining Group, LLC; 2014-08-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Pei Lien  Lo Hwang et al → Pacific Mining Group, LLC; 2014-08-25 to current/open; source msha-controller-operator-history