# Relationship history for MSHA mine 2602573

Current hierarchy: **Barrick Nevada Holding LLC; Newmont USA Limited → Nevada Gold Mines LLC → Cortez District-Underground**

- 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:** Ronald W  Guill → Cortez District-Underground; 1988-04-01 to 2011-01-27; source msha-controller-operator-history
- **operator_operates_mine:** Small Mine Development LLC → Cortez District-Underground; 2005-11-08 to 2008-05-15; source msha-controller-operator-history
- **controller_controls_operator:** Ronald W  Guill → Small Mine Development LLC; 2005-11-08 to 2008-05-15; source msha-controller-operator-history
- **operator_operates_mine:** CORTEZ JOINT VENTURE → Cortez District-Underground; 2008-05-16 to 2012-01-16; source msha-controller-operator-history
- **controller_controls_mine:** Barrick Gold Corp → Cortez District-Underground; 2008-05-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Barrick Gold Corp → CORTEZ JOINT VENTURE; 2008-05-16 to 2012-01-16; source msha-controller-operator-history
- **controller_controls_mine:** Keith  Jones → Cortez District-Underground; 2011-01-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Keith  Jones → Small Mine Development LLC; 2011-01-28 to 2008-05-15; source msha-controller-operator-history
- **operator_operates_mine:** Barrick Cortez Inc. → Cortez District-Underground; 2012-01-17 to 2019-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Barrick Gold Corp → Cortez District-Underground; 2012-01-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Barrick Gold Corp → Barrick Cortez Inc.; 2012-01-17 to 2019-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Nevada Gold Mines LLC → Cortez District-Underground; 2019-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Barrick Nevada Holding LLC et al → Cortez District-Underground; 2019-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Barrick Nevada Holding LLC et al → Nevada Gold Mines LLC; 2019-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Newmont USA Limited et al → Nevada Gold Mines LLC; 2019-07-01 to current/open; source msha-controller-operator-history