 Platinum , along with the rest of the platinum @-@ group metals , is obtained commercially as a by @-@ product from nickel and copper mining and processing . During electrorefining of copper , noble metals such as silver , gold and the platinum @-@ group metals as well as selenium and tellurium settle to the bottom of the cell as " anode mud " , which forms the starting point for the extraction of the platinum @-@ group metals . 
