# Relationship history for MSHA mine 2602693

Current hierarchy: **Barrick Nevada Holding LLC; Newmont USA Limited → Nevada Gold Mines LLC → Twin 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:** Newmont Corporation → Twin Underground; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ronald W  Guill → Twin Underground; 1988-04-01 to 2011-01-27; source msha-controller-operator-history
- **controller_controls_mine:** Keith  Jones → Twin Underground; 2011-01-28 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Small Mine Development LLC → Twin Underground; 2011-02-22 to 2011-06-05; source msha-controller-operator-history
- **controller_controls_operator:** Keith  Jones → Small Mine Development LLC; 2011-02-22 to 2011-06-05; source msha-controller-operator-history
- **controller_controls_operator:** Ronald W  Guill → Small Mine Development LLC; 2011-02-22 to 2011-01-27; source msha-controller-operator-history
- **operator_operates_mine:** Newmont USA Limited → Twin Underground; 2011-06-06 to 2019-07-28; source msha-controller-operator-history
- **controller_controls_operator:** Newmont Corporation → Newmont USA Limited; 2011-06-06 to 2019-07-28; source msha-controller-operator-history
- **controller_controls_mine:** Newmont USA Limited et al → Twin Underground; 2019-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Nevada Gold Mines LLC → Twin Underground; 2019-07-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Newmont USA Limited et al → Nevada Gold Mines LLC; 2019-07-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Barrick Nevada Holding LLC et al → Nevada Gold Mines LLC; 2019-07-29 to current/open; source msha-controller-operator-history