How do you tell the difference between gold and brass coins?I have a coin and I can't tell if it is gold or brass the only test I know to do on it is the magnet . by many jewelers is to rub the brass object between or with your fingers. . It is very shiny on the outside & kind of dirty copper looking on the inside.how do you know the difference between gold and copper ore,Gold - Mine EngineerThis is a complex gold ore with oxide gold in a quartz vein with sulfide gold. . Gold occurs in association with ores of copper and lead, in quartz veins, in the . can not tell the difference between the second photo, of pyrite on a gold nugget,.
how do you know the difference between gold and copper ore