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.
Height Above and Below Countertops. You need to install 125-volt, 15- or 20-amp receptacles on the wall behind a countertop that is 2 feet or more in width, and these need to be spaced in such a way that no point on the counter is more than 2 feet away from one. They can be no higher than 20 inches above the counter.