We have scheduled our blast for next Wednesday, September 4, 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