# Relationship history for MSHA mine 0404087

Current hierarchy: **Ball William G-Charles J Mitchell → Diablo Gold Ltd → DEPOT HILL MINE & MILL**

- 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:** Diablo Gold Ltd → DEPOT HILL MINE & MILL; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ball William G-Charles J Mitchell Et Al → DEPOT HILL MINE & MILL; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ball William G-Charles J Mitchell Et Al → Diablo Gold Ltd; 1950-01-01 to current/open; source msha-controller-operator-history