# Relationship history for MSHA mine 5001989

Current hierarchy: **Richard A  Ryser; Lori L  Ryser → Golden Alaska Excavating, LLC → Golden Alaska Mobile**

- 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:** Golden Alaska Excavating, LLC → Golden Alaska Mobile; 2012-11-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Richard A  Ryser → Golden Alaska Mobile; 2012-11-29 to 2016-09-27; source msha-controller-operator-history
- **controller_controls_operator:** Richard A  Ryser → Golden Alaska Excavating, LLC; 2012-11-29 to 2016-09-27; source msha-controller-operator-history
- **controller_controls_mine:** Richard A  Ryser et al → Golden Alaska Mobile; 2016-09-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard A  Ryser et al → Golden Alaska Excavating, LLC; 2016-09-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lori L  Ryser et al → Golden Alaska Excavating, LLC; 2016-09-28 to current/open; source msha-controller-operator-history