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.
Chilean copper-mining company Antofagasta produced 370,000 tonnes of copper in 2016, a decrease from 2015âs total of 370,000 tonnes. In the first half of 2017, the company produced 346,300 tonnes of copper, a 7.1-percent increase over the same period in 2016.
S. ore. Fourteen domestic mines accounted for more than 95 percent of the 1.45 megagrams (Mg)(1.6 millon tons) of ore produced in 1991.Copper is produced in the U. S. primarily by pyrometallurgical smelting methods.Pyrometallurgical techniques use heat to separate copper from copper sulfide ore concentrates.xpressed as kg of pollutant/Mg of concentrated ore processed by smelter.Approximately 4 unit weights of concentrate are required to produce 1 unit weights of copper metal.Based on test data for several smelters with 0.1 to 0.4% lead in feed throughput.