Our Martin Marietta Vigilante Quarry tour started off with a warm welcome from our tour guides with breakfast and coffee.  We discussed our roles within the asphalt emulsion industry before sitting down for a presentation by Plant Manager, Craig Posvar.  Craig went over the plant’s history and their overall operation within the Southern California market.  It was great to see how excited they were to host us for the tour!  Martin Marietta is a new ISSA member, which led to good discussions with their team. 

Once the dump truck is loaded, the rock is taken to the crusher and broken down to smaller pieces. The primary crusher rate is 250 tons per hour, secondary crusher is 300 tons per hour, and the finishing screen is 300 tons per hour. There are screens at the bottom of each crusher that let the smaller rock fall to the next crusher.  From there, the rock goes onto conveyer belts to get sorted by aggregate size.  Different size grates sieve the rock so that it can be sent to the necessary stockpile area.  To ensure this all happens smoothly, the quarry integrates sensors and cameras throughout the plant. This technology allows control from either the primary master control position, the control tower or the plant manager’s office.