The Dutra San Rafael Rock Quarry will be assisting Ghilotti Construction by providing the rip rap materials needed to fill the breach in the levee at Digital Drive in Bel Marin Keys, Novato. This job is under emergency contract with the California State Coastal Conservancy. Trucking of the materials will be needed Friday 2/15 until 9pm, Saturday 2/16 and Sunday 2/17 from 7am to 9pm. We will keep everyone informed if there were to be further changes. Thank you in advance for your understanding and cooperation.

For any questions or concerns, please contact Aimi Dutra at 415-307-1592.

 In regards to blasting, the San Rafael Rock Quarry will begin occasionally conducting “sinking cuts” or “ramp shots” blasts at the Quarry.  These blasts are different from typical blasting operations in that the blast direction shoots vertically instead of horizontally.  These type of blasts will, periodically, be needed as mining operations progress deeper into the pit. 

The only noticeable difference between these blasts and traditional blasting is that the sinking cut blasts create higher ground level vibrations.  However, these vibrations are expected to continue to be well below permitted levels. 

If you have any questions regarding our blasting operations, please call Aimi Dutra at (415) 307-1592 or email at