The mining industry spans the globe, as do alumni of the University of Arizona mining and geological engineering program. Many got their feet wet working as interns for Arizona-based mining companies like Freeport-McMoRan.
Weight A 1 Â½ inch thick countertop made of standard concrete has an approximate weight of 18.75 pounds per square foot. (Granite is approximately 18 pounds per square foot.) Standard cabinetry will typically support this weight because itâs distributed over a large area.
Oliver's Classic Granite Countertop Bracket >>. Important! Granite Spans and Cantilevers. In designs where your countertop spans supports, the length of the span (side to side as your facing it) should be limited to 24 for Â¾ (2CM) thick stone and 36 for 1Â¼ (3CM) stone thicknesses.