# Robertson's Portable Powerscreen Plant
> **Metal/Non-metal** mine · MSHA ID `0405662` · Surface · **Abandoned**
## Operator
- **Controller (parent):** RRM Development Corporation; Mitsubishi Corp
- **Operator:** Robertson's Ready-Mix
- **Employees:** 0
- **Commodity:** SandAndGravel
## Location
- **State:** CA · San Bernardino Co.
- **Coordinates:** 33.879026, -117.565928
## Safety record
- **Total accidents/injuries:** 0
- **Fatalities:** 0
- **Total days lost:** 0
---
*Source: [MSHA Open Government Data](https://arlweb.msha.gov/OpenGovernmentData/) · AI Analytics · CC0 1.0*