Mines and quarries in San Luis Obispo County, CA
10 mines not abandoned in San Luis Obispo County, CA, in the MSHA file of October 2, 2026.
| Mine | Mine ID | Industry group | Status since |
|---|---|---|---|
| Bianchi Pit David Crye General Engineering and Contractor, Inc | 0405561 | Sand and gravel | Jun 4, 2003 |
| Blue Mountain Minerals PR LLC | 0400099 | Stone | Jun 5, 1981 |
| Estrella Sand Pit Viborg Sand & Gravel, Inc. | 0405891 | Nonmetal | Jun 4, 2019 |
| MTN SPRINGS RD. PIT Viborg Sand & Gravel Inc | 0405040 | Sand and gravel | Jun 1, 2019 |
| Navajo Rock & Block David Crye General Engineering Contractor, Inc. | 0404240 | Sand and gravel | Jul 1, 2012 |
| Paso Robles Plant Calportland Construction | 0405492 | Sand and gravel | Aug 1, 2001 |
| Rocky Canyon Plant Calportland Construction | 0404634 | Stone | Apr 11, 1983 |
| Santa Margarita Aggregates Martin Marietta Northern California Aggregates,LLC | 0401616 | Sand and gravel | Apr 23, 1974 |
| Warrior 1800/Cone Crusher FT200 David Crye General Engineering Contractor | 0405895 | Nonmetal | Feb 25, 2026 |
| Whale Rock Quarry Negranti & Sons | 0404635 | Stone | Nov 12, 2004 |
Alphabetical order — this site ranks no one. Mines that are not abandoned in the MSHA file of October 2, 2026. Sole proprietors are found by mine ID only. How to read this.