# Relationship history for MSHA mine 3503717

Current hierarchy: **Thomas  Hammond → Mineral Valley LLC → Three Valleys Mine #1**

- 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:** Three Valleys Ranch → Three Valleys Mine #1; 2009-05-31 to 2012-04-15; source msha-controller-operator-history
- **controller_controls_mine:** Thomas  Hammond → Three Valleys Mine #1; 2009-05-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thomas  Hammond → Three Valleys Ranch; 2009-05-31 to 2012-04-15; source msha-controller-operator-history
- **controller_controls_mine:** Thomas  Hammond → Three Valleys Mine #1; 2010-03-03 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mineral Valley LLC → Three Valleys Mine #1; 2012-04-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thomas  Hammond → Mineral Valley LLC; 2012-04-16 to current/open; source msha-controller-operator-history