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Dear Sir,We have a very reputable Buyer for Coltan. We also need Cu, Mn, Ni etcPlease send your Offer ASAP to: trintecgmail.comWe look forward to working with you.SincerelySam SeeparsadTrintec Vancouver, CanadaPhone/WhatsApp: 1-604-291-6386 Fax: 604-291-6580email: trintecgmail.com