# Relationship history for MSHA mine 2601821

Current hierarchy: **Dorow Art → Sky Scientific Mining & Processing Inc → Dun Glen Placer**

- 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:** Homestake Mining Company → Dun Glen Placer; 1950-01-01 to 2001-12-13; source msha-controller-operator-history
- **operator_operates_mine:** Proquip General Partnership → Dun Glen Placer; 1982-10-01 to 1985-03-10; source msha-controller-operator-history
- **controller_controls_mine:** Conn Bart Et Al → Dun Glen Placer; 1982-10-01 to 1989-10-24; source msha-controller-operator-history
- **controller_controls_operator:** Conn Bart Et Al → Proquip General Partnership; 1982-10-01 to 1985-03-10; source msha-controller-operator-history
- **operator_operates_mine:** Homestake Mining Company Of California → Dun Glen Placer; 1985-03-11 to 1985-11-14; source msha-controller-operator-history
- **controller_controls_operator:** Homestake Mining Company → Homestake Mining Company Of California; 1985-03-11 to 1985-11-14; source msha-controller-operator-history
- **operator_operates_mine:** Proquip General Partnership → Dun Glen Placer; 1985-11-15 to 1989-10-24; source msha-controller-operator-history
- **controller_controls_operator:** Conn Bart Et Al → Proquip General Partnership; 1985-11-15 to 1989-10-24; source msha-controller-operator-history
- **operator_operates_mine:** Vaughan Construction → Dun Glen Placer; 1989-10-25 to 1992-04-03; source msha-controller-operator-history
- **controller_controls_mine:** Vaughan Otis L → Dun Glen Placer; 1989-10-25 to 1992-04-03; source msha-controller-operator-history
- **controller_controls_operator:** Vaughan Otis L → Vaughan Construction; 1989-10-25 to 1992-04-03; source msha-controller-operator-history
- **operator_operates_mine:** Tahoe Milling Inc → Dun Glen Placer; 1992-04-04 to 1994-07-27; source msha-controller-operator-history
- **controller_controls_mine:** Garst James → Dun Glen Placer; 1992-04-04 to 1994-07-27; source msha-controller-operator-history
- **controller_controls_operator:** Garst James → Tahoe Milling Inc; 1992-04-04 to 1994-07-27; source msha-controller-operator-history
- **controller_controls_mine:** Dorow Art → Dun Glen Placer; 1993-11-29 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sky Scientific Mining & Processing Inc → Dun Glen Placer; 1994-07-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dorow Art → Sky Scientific Mining & Processing Inc; 1994-07-28 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Barrick Gold Corp → Dun Glen Placer; 2001-12-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Barrick Gold Corp → Homestake Mining Company Of California; 2001-12-14 to 1985-11-14; source msha-controller-operator-history