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we're looking copper concentrate with cu content 20% above with S >20% As less than 0.5% size 200mesh quantity: 500mt per month regularly; besides we purchase gold concentrate with Au 30g above from flotation process only; silver-lead mixed concentrate with Ag more than 1200g pb more than 15% with 1000mt per month regularly; we can accept FOB, FCA term payment: D/P ;T/T