# Relationship history for MSHA mine 2901931

Current hierarchy: **Barbara Maurice E → Dynapac Inc - Golden Gulch Inc → Ladder #1 Golden Gulch Mining Company**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Golden Gulch Mining Company Inc → Ladder #1 Golden Gulch Mining Company; 1983-08-01 to 1985-04-28; source msha-controller-operator-history
- **controller_controls_mine:** Schwab Glen → Ladder #1 Golden Gulch Mining Company; 1983-08-01 to 1985-04-28; source msha-controller-operator-history
- **controller_controls_operator:** Schwab Glen → Golden Gulch Mining Company Inc; 1983-08-01 to 1985-04-28; source msha-controller-operator-history
- **operator_operates_mine:** Dynapac Inc - Golden Gulch Inc → Ladder #1 Golden Gulch Mining Company; 1985-04-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Barbara Maurice E Et Al → Ladder #1 Golden Gulch Mining Company; 1985-04-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Barbara Maurice E Et Al → Dynapac Inc - Golden Gulch Inc; 1985-04-29 to current/open; source msha-controller-operator-history