We have scheduled our blast for next Wednesday October 2, 2019

Blasting occurs between 11:30am to 1:30pm.

 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



The San Rafael Rock Quarry is committed to maintaining a good relationship with its neighbors. Here are a few examples of the steps taken by the San Rafael Rock Quarry to ensure that we are a good neighbor:

  • Restricted work hours on some of the more audible operations to weekday day-time hours
  • Implemented a daily street-sweeping of Point San Pedro Road
  • Installed a new truck wash station to reduce debris track-out onto Point San Pedro Road
  • Limited the amount of daily truck trips to and from the Quarry
  • Put into use the reduced noise back-up alarm systems on the trucks at the Quarry

Traffic & Congestion

What makes the Quarry unique is that we are the only Northern California Quarry with direct waterside access and a barge delivery system the operation of which removes trucks from roadways, reducing traffic congestion and vehicle emissions.  It also allows us to provide essential materials to locations in the Delta, and beyond, some of which are only accessible by water.

Economy and Jobs

The San Rafael Rock Quarry provides a local source for important public works and private development projects in the community.  The Dutra Group employs approximately 175 people and many more seasonally. 

Emergency Relief and Disaster Prevention

Locally, the Quarry has responded to levee failures in Novato near Rowland Blvd. and Hamilton Field, hillside slides in Fairfax and Larkspur, and flooding in downtown San Anselmo.

On a broader scale, the Quarry is a major supplier of materials to the levee system in the Sacramento/San Joaquin Delta.  In 2006, our Quarry was called upon to carry out the emergency repair of 29 levees in the Sacramento/San Joaquin Delta, the collapse of which would have devastated the region and the state’s water supply.  The Delta is home to thousands of residents, precious agricultural resources, and many species of birds and aquatic life.