Coking (metallurgical) coal is used in steel making and thermal (steam) coal is used in power generation. Have a look at this webpage for more details: http://www.homelandenergygroup.com/s/Coal.asp?ReportID=338859&_Title=Comment-on-Coking-Coal-vs-Thermal-Coal

The price of copper is mainly influenced by the supply and demand for the metal. On the demand side, copper correlates to the economy because it’s used as a building material and used in manufacturing wires and pipes. When the economy is growing, copper prices tend to rise and when the economy is slowing, the price of copper usually drops. On the supply side, any interruption in copper production could result in price spikes.