# Relationship history for MSHA mine 0503486

Current hierarchy: **Cobb Resources Corp & Boulder Gold Inc → London Mine Venture → Alma Project Mill**

- 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:** Silver State Mining Corp → Alma Project Mill; 1979-09-01 to 1985-03-10; source msha-controller-operator-history
- **controller_controls_mine:** William W  Reed → Alma Project Mill; 1979-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William W  Reed → Silver State Mining Corp; 1979-09-01 to 1985-03-10; source msha-controller-operator-history
- **controller_controls_mine:** A W  Wadsworth → Alma Project Mill; 1984-11-14 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Dorado Mining Company Inc → Alma Project Mill; 1985-03-11 to 1985-11-25; source msha-controller-operator-history
- **controller_controls_operator:** A W  Wadsworth → Dorado Mining Company Inc; 1985-03-11 to 1985-11-25; source msha-controller-operator-history
- **operator_operates_mine:** Silver State Mining Corp → Alma Project Mill; 1985-11-26 to 1988-04-10; source msha-controller-operator-history
- **controller_controls_operator:** William W  Reed → Silver State Mining Corp; 1985-11-26 to 1988-04-10; source msha-controller-operator-history
- **operator_operates_mine:** London Mine Venture → Alma Project Mill; 1988-04-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cobb Resources Corp & Boulder Gold Inc → Alma Project Mill; 1988-04-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cobb Resources Corp & Boulder Gold Inc → London Mine Venture; 1988-04-11 to current/open; source msha-controller-operator-history