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EL CAJON QUARRY

Hwy 8 east to 2nd St. South on 2nd to Jamacha. Continue South on Jamacha to Willow Glen. Left (east) on Willow Glen, continue 2 1/2 miles to plant entrance on left., San Diego County, CA
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MSHA ID0400133
TYPESurface
MATERIALCrushed, Broken Granite
EMPLOYEES5

MATERIALS PRODUCED

Crushed, Broken Granite

COMPANY INFORMATION

Operator

Robertson's Ready Mix Ltd

Parent Company

RRM Development Corporation; Mitsubishi Corp

Company Type

Partnership

DIRECTIONS

110

CONTACT

Contact information not available for unclaimed listings.

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32.764722, -116.890000

Data Source

Mine Safety and Health Administration (MSHA)

Last updated: 1/30/2026

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