# Relationship history for MSHA mine 3503663

Current hierarchy: **Todd R  Hoffman → 316 Mining, L.L.C. → Portable**

- 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:** Twin Lake Ranch LLC → Portable; 2007-04-05 to 2011-05-25; source msha-controller-operator-history
- **controller_controls_mine:** Kevin Cletus  Whited → Portable; 2007-04-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kevin Cletus  Whited → Twin Lake Ranch LLC; 2007-04-05 to 2011-05-25; source msha-controller-operator-history
- **operator_operates_mine:** Western Mine Development, LLC → Portable; 2011-05-26 to 2015-11-13; source msha-controller-operator-history
- **controller_controls_mine:** Philip  Wirth → Portable; 2011-05-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Philip  Wirth → Western Mine Development, LLC; 2011-05-26 to 2015-11-13; source msha-controller-operator-history
- **controller_controls_mine:** Todd R  Hoffman → Portable; 2015-09-20 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** 316 Mining, L.L.C. → Portable; 2015-11-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Todd R  Hoffman → 316 Mining, L.L.C.; 2015-11-14 to current/open; source msha-controller-operator-history