# Relationship history for MSHA mine 0503208

Current hierarchy: **Mickey W  Tiner → 42 MWT Mining Company LLC → Ruby Mine Trust**

- 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:** Walker Mining & Milling Inc → Ruby Mine Trust; 1978-03-09 to 1984-05-21; source msha-controller-operator-history
- **controller_controls_mine:** David L  Walker → Ruby Mine Trust; 1978-03-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David L  Walker → Walker Mining & Milling Inc; 1978-03-09 to 1984-05-21; source msha-controller-operator-history
- **operator_operates_mine:** Walker Mining & Milling Inc → Ruby Mine Trust; 1984-05-22 to 1985-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Talbot Edward F → Ruby Mine Trust; 1984-05-22 to 1985-07-09; source msha-controller-operator-history
- **controller_controls_operator:** Talbot Edward F → Walker Mining & Milling Inc; 1984-05-22 to 1985-07-09; source msha-controller-operator-history
- **operator_operates_mine:** Walker Mining & Milling Inc → Ruby Mine Trust; 1985-07-10 to 2008-06-24; source msha-controller-operator-history
- **controller_controls_operator:** David L  Walker → Walker Mining & Milling Inc; 1985-07-10 to 2008-06-24; source msha-controller-operator-history
- **operator_operates_mine:** Mount Sneffels Mining Company LLC → Ruby Mine Trust; 2008-06-25 to 2011-01-19; source msha-controller-operator-history
- **controller_controls_mine:** Keith  Emmett et al → Ruby Mine Trust; 2008-06-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Keith  Emmett et al → Mount Sneffels Mining Company LLC; 2008-06-25 to 2011-01-19; source msha-controller-operator-history
- **controller_controls_operator:** Wiley  McCall et al → Mount Sneffels Mining Company LLC; 2008-06-25 to 2011-01-19; source msha-controller-operator-history
- **operator_operates_mine:** Walker Ruby Mining Company, Inc. → Ruby Mine Trust; 2011-01-20 to 2015-09-30; source msha-controller-operator-history
- **controller_controls_mine:** David L  Walker → Ruby Mine Trust; 2011-01-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David L  Walker → Walker Ruby Mining Company, Inc.; 2011-01-20 to 2015-09-30; source msha-controller-operator-history
- **operator_operates_mine:** Underground Specialty Company LLC → Ruby Mine Trust; 2015-10-01 to 2016-03-01; source msha-controller-operator-history
- **controller_controls_mine:** Barbara  Clark et al → Ruby Mine Trust; 2015-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Barbara  Clark et al → Underground Specialty Company LLC; 2015-10-01 to 2016-03-01; source msha-controller-operator-history
- **controller_controls_operator:** Jack  Clark et al → Underground Specialty Company LLC; 2015-10-01 to 2016-03-01; source msha-controller-operator-history
- **operator_operates_mine:** 42 MWT Mining Company LLC → Ruby Mine Trust; 2016-03-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mickey W  Tiner → Ruby Mine Trust; 2016-03-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mickey W  Tiner → 42 MWT Mining Company LLC; 2016-03-02 to current/open; source msha-controller-operator-history