Differentiate fixed costs and variable costs. 1  Total cost is the sum of fixed and variable costs.  Variable costs change according to the quantity of a good or service being produced. The amount of materials and labor that is needed for to make a good increases in direct proportion to the number of goods produced.
Southern Copper Corporation is an American-based copper producer with major operations in Mexico and Peru. Grupo Mexico currently owns 75.1% of the company, which produced 487 thousand metric tons of copper in 2010. Major assets include the Cuajone and Toquepala mines in Peru and the Cananea mine in Mexico.
1 About Us United States Brass & Copper has been providing the highest quality mill products throughout North America since 1925. We have developed a reputation as the leader in the industry for superior service, quality and competitive pricing. United States Brass & Copper maintains an extensive inventory of materials in the widest range of sizes, including aluminum, brass, bronze, beryllium copper, copper and stainless steel.