ERM Rock — Quarry and material-source record

Primary commodity in source: Construction Sand and Gravel; Operator in source: Eureka Ready Mix Concrete Co Inc. Recorded location: Humboldt, CA. Review the recorded source identity, location and material information together. Confirm current eligibility and operating details with the original publisher.

StateCA

Source-backed record from MSHA surface aggregate mine register. Browse the labeled observations and original source below.

Source collection: MSHA surface aggregate mine register
Source checked: 2026-10-15

Reported record details

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Source data row 7477

MSHA mine-register snapshot: INTERMITTENT operation in the source. This is not a claim of continuous production, current availability or DOT materials approval. Coordinates are reported by the source and may represent portable operations.

MSHA mine ID: 0405368
Mine name in source: ERM Rock
Mine type in source: Surface
Status in source: Intermittent
Status effective date in source: 12/10/2018
Operator in source: Eureka Ready Mix Concrete Co Inc
State: CA
County: Humboldt
Nearest town in source: FORTUNA CA
Primary commodity code: 144200
Primary commodity in source: Construction Sand and Gravel
Portable operation flag (Y/N): N
Reported latitude: 40.540278
Reported longitude: -124.146667

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—	Source data row 7477 · MSHA mine-register snapshot: INTERMITTENT operation in the source. This is not a claim of continuous production, current availability or DOT materials approval. Coordinates are reported by the source and may represent portable operations.

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Source data row 7477

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