# Relationship history for MSHA mine 2602672

Current hierarchy: **Terrance L  Howard → TNT Ventures, LLC → Big Canyon 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:** TNT Ventures, LLC → Big Canyon Mine; 2009-04-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Terry  Howard et al → Big Canyon Mine; 2009-04-21 to 2011-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Terry  Howard et al → TNT Ventures, LLC; 2009-04-21 to 2011-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Robert  Infantino et al → TNT Ventures, LLC; 2009-04-21 to 2011-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Terrance L  Howard → Big Canyon Mine; 2012-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Terrance L  Howard → TNT Ventures, LLC; 2012-01-01 to current/open; source msha-controller-operator-history