Round Mountain Rock — Quarry and material-source record

Primary commodity in source: Crushed, Broken Stone NEC; Operator in source: Round Mountain Rock. Recorded location: Lassen, 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 7669

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: 0405571
Mine name in source: Round Mountain Rock
Mine type in source: Surface
Status in source: Intermittent
Status effective date in source: 05/30/2023
Operator in source: Round Mountain Rock
State: CA
County: Lassen
Nearest town in source: Westwood
Primary commodity code: 142900
Primary commodity in source: Crushed, Broken Stone NEC
Portable operation flag (Y/N): N
Reported latitude: 40.286389
Reported longitude: -120.928333

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—	Source data row 7669 · 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 7669

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