# Relationship history for MSHA mine 0400099

Current hierarchy: **Portola Minerals Company → Blue Mountain Minerals PR LLC → Blue Mountain Minerals PR 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Lime Mountain Company → Blue Mountain Minerals PR LLC; 1950-01-01 to 2016-01-03; source msha-controller-operator-history
- **controller_controls_mine:** Bonnie L  Wahl → Blue Mountain Minerals PR LLC; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bonnie L  Wahl → Lime Mountain Company; 1950-01-01 to 2016-01-03; source msha-controller-operator-history
- **operator_operates_mine:** Blue Mountain Minerals PR LLC → Blue Mountain Minerals PR LLC; 2016-01-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Portola Minerals Company → Blue Mountain Minerals PR LLC; 2016-01-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Portola Minerals Company → Blue Mountain Minerals PR LLC; 2016-01-04 to current/open; source msha-controller-operator-history