# Relationship history for MSHA mine 2901375

Current hierarchy: **Blue James N → Rio Grande Resources Corp → Mt Taylor 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:** Chevron Corporation → Mt Taylor Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Gulf Mineral Resources Company → Mt Taylor Mine; 1950-01-01 to 1984-06-14; source msha-controller-operator-history
- **controller_controls_mine:** Gulf Oil Corp → Mt Taylor Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gulf Oil Corp → Gulf Mineral Resources Company; 1950-01-01 to 1984-06-14; source msha-controller-operator-history
- **operator_operates_mine:** Chevron Resources Company → Mt Taylor Mine; 1984-06-15 to 1991-07-31; source msha-controller-operator-history
- **controller_controls_operator:** Chevron Corporation → Chevron Resources Company; 1984-06-15 to 1991-07-31; source msha-controller-operator-history
- **operator_operates_mine:** Rio Grande Resources Corp → Mt Taylor Mine; 1991-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Blue James N → Mt Taylor Mine; 1991-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Blue James N → Rio Grande Resources Corp; 1991-08-01 to current/open; source msha-controller-operator-history