http://importer.ec21.com/buy_leads/w au.html http://www.ec21.com/offer_detail/Buy_Copper_Concentrate_Ore_25--2100891.htmlAu 0.2-0.3gr/mt Se 60-80gr/mt Te 6.5-8.5gr/mt Ni 0.006gr/mt Bi <0.0.1% SiO 5-8% Mg 0.3-1% Ca 0.4-0.9% Cd 0.001% W <10% 20091226