By the time smelter deductions (-1 g/t Au and -30 g/t Ag) are applied, the payable value for the precious metals will be relatively low and the transport cost high related to the value of the metals in the concentrate.

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The Scoping Study 's economic model suggests a charge for smelting and rening be made against the gross revenue from metals sales. This "smelter deduction " is estimated at 14%of gross metal value. http://www.secinfo.com/d12MGs.z294.9.htm