Silvi Materials is one of the most progressive and cutting edge construction material suppliers in the country. Being fully i ... ntegrated Silvi has an abundant supply of stone, sand, and cement. This allows us to produce concrete that is not only uniform and consistent from truck to truck, but also from year to year. Silvi Concrete services most of New Jersey and Southeastern Pennsylvania. With over 200 readymix trucks Silvi Concrete has one of the largest front discharge fleets in the region. Sahara Sand has over 160 million tons of reserve and manufactures a multitude of products ranging from concrete sand to clay and everything in between. Gibraltar Rock stone quarries stretch over 750 acres and produce a hard, cubicle aggregate perfect for concrete. Gibraltar Rock has 350 Million tons of reserves produces aggregate ranging from large jetty stone for beach protection to fine aggregate millings for fill. Riverside Cement features one of the largest terminals in the world. Its live capacity of 160,000 tons and can offload a ship at a rate of 525 tons per hour. It also has the capability of handling salt, gypsum and other bulk products utilizing a state of the art conveyor system. Riverside is also one of the largest distributors of rock salt. Our rock salt is sold in bulk to contractors and municipalities for de-icing read more