← MSHA mines + accidents
Quarry #4
Metal/Non-metal · Surface · 0404732 · Abandoned
Operator
- Controller (parent)
- Sam Johnson; Ralph Johnson
- Operator
- American Rock & Asphalt Inc
- Commodity
- Stone
Location
- State
- CA · Contra Costa Co.
- Congressional district
- 07
Source
- Authoritative
- MSHA Mine Data Retrieval System
- Machine
- JSON-LD · Markdown