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.
Xtrata is a top five producer of copper, thermal coal, coking coal, ferrochrome, zinc and nickel and has operations in 19 countries. The company's copper production in 2010 was over 900 thousand metric tons and it has copper facilities located in Australia, Chile, Peru, Argentina, and Canada.
Please select from the categories below... A&E Metals manufactures a large range of silver and gold wire, sheet and solder in Australia for jewellery industry and industrial applications. We also supply a range of other precious and base metals, including platinum, titanium, brass and copper. Because we manufacture in Australia can we produce a wide range of metals and custom alloys, from sterling silver wire for jewellery making to fine silver rod for electrical contacts.