# Relationship history for MSHA mine 2601381

Current hierarchy: **Cal-Denver Resources Ltd → Cal-Denver Resources Ltd → New York 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

- **operator_operates_mine:** Houston Oil & Minerals Corp → New York Mine; 1950-01-01 to 1983-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Houston Oil & Minerals Corp & Western Gold Venture → New York Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Houston Oil & Minerals Corp & Western Gold Venture → Houston Oil & Minerals Corp; 1950-01-01 to 1983-10-31; source msha-controller-operator-history
- **operator_operates_mine:** Cal-Denver Resources Ltd → New York Mine; 1983-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cal-Denver Resources Ltd → New York Mine; 1983-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cal-Denver Resources Ltd → Cal-Denver Resources Ltd; 1983-11-01 to current/open; source msha-controller-operator-history