# Relationship history for MSHA mine 2401425

Current hierarchy: **Alfred  Hokanson → A M Welles Inc → ANTLER MINE**

- 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:** Antler Mining Company → ANTLER MINE; 1978-03-09 to 1984-10-08; source msha-controller-operator-history
- **controller_controls_mine:** Nolte Robert & Sylvan Donegan Jr → ANTLER MINE; 1978-03-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nolte Robert & Sylvan Donegan Jr → Antler Mining Company; 1978-03-09 to 1984-10-08; source msha-controller-operator-history
- **controller_controls_mine:** Cyprus Amax Minerals Company → ANTLER MINE; 1980-09-22 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Cyprus Industrial Minerals Company → ANTLER MINE; 1984-10-09 to 1992-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Cyprus Amax Minerals Company → Cyprus Industrial Minerals Company; 1984-10-09 to 1992-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Alfred  Hokanson → ANTLER MINE; 1989-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Luzenac America, Inc. → ANTLER MINE; 1992-07-01 to 1994-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Rio Tinto Group → ANTLER MINE; 1992-07-01 to 2011-07-31; source msha-controller-operator-history
- **controller_controls_operator:** Rio Tinto Group → Luzenac America, Inc.; 1992-07-01 to 1994-09-30; source msha-controller-operator-history
- **operator_operates_mine:** A M Welles Inc → ANTLER MINE; 1994-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alfred  Hokanson → A M Welles Inc; 1994-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Imerys S A → ANTLER MINE; 2011-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Imerys S A → Luzenac America, Inc.; 2011-08-01 to 1994-09-30; source msha-controller-operator-history