# Relationship history for MSHA mine 4608113

Current hierarchy: **Sears Casey Ii & Mike → Big Sky Mining Inc → Alison 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

- **controller_controls_mine:** John T  Markovich → Alison Mine; 1980-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Harrison Fuels Inc → Alison Mine; 1991-11-01 to 1992-11-23; source msha-controller-operator-history
- **controller_controls_operator:** John T  Markovich → Harrison Fuels Inc; 1991-11-01 to 1992-11-23; source msha-controller-operator-history
- **operator_operates_mine:** Whitetail Energy Corp → Alison Mine; 1992-11-24 to 1993-08-08; source msha-controller-operator-history
- **controller_controls_mine:** Pearson Frank R → Alison Mine; 1992-11-24 to 1993-08-08; source msha-controller-operator-history
- **controller_controls_operator:** Pearson Frank R → Whitetail Energy Corp; 1992-11-24 to 1993-08-08; source msha-controller-operator-history
- **operator_operates_mine:** Harrison Fuels Inc → Alison Mine; 1993-08-09 to 1994-06-26; source msha-controller-operator-history
- **controller_controls_operator:** John T  Markovich → Harrison Fuels Inc; 1993-08-09 to 1994-06-26; source msha-controller-operator-history
- **operator_operates_mine:** Marion Minerals Inc → Alison Mine; 1994-06-27 to 1995-05-10; source msha-controller-operator-history
- **controller_controls_mine:** Paul F  Thomas → Alison Mine; 1994-06-27 to 1995-05-10; source msha-controller-operator-history
- **controller_controls_operator:** Paul F  Thomas → Marion Minerals Inc; 1994-06-27 to 1995-05-10; source msha-controller-operator-history
- **operator_operates_mine:** Big Sky Mining Inc → Alison Mine; 1995-05-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Sears Casey Ii & Mike → Alison Mine; 1995-05-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sears Casey Ii & Mike → Big Sky Mining Inc; 1995-05-11 to current/open; source msha-controller-operator-history