 In nickel and copper deposits , platinum @-@ group metals occur as sulfides ( e.g. ( Pt , Pd ) S ) , tellurides ( e.g. PtBiTe ) , antimonides ( PdSb ) , and arsenides ( e.g. PtAs2 ) , and as end alloys with nickel or copper . Platinum arsenide , <unk> ( PtAs2 ) , is a major source of platinum associated with nickel ores in the Sudbury Basin deposit in Ontario , Canada . At Platinum , Alaska , about 17 @,@ 000 kg ( 550 @,@ 000 ozt ) had been mined between 1927 and 1975 . The mine ceased operations in 1990 . The rare sulfide mineral <unk> , ( Pt , Pd , Ni ) S , contains platinum along with palladium and nickel . <unk> occurs in the Merensky Reef within the Bushveld complex , Gauteng , South Africa . 
