# Relationship history for MSHA mine 0201980

Current hierarchy: **Bisel Charlie → J & C Mining Company → Speed Leach Mill #1**

- 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:** J & C Mining Company → Speed Leach Mill #1; 1980-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bisel Charlie → Speed Leach Mill #1; 1980-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bisel Charlie → J & C Mining Company; 1980-04-01 to current/open; source msha-controller-operator-history