fashion showing major process equipment / metal / finished metal product / precious and base metal systems level / downstream processing / mineral processing plant / silver metal / finished metal product external / mineral deposit saleable product / aqueous media / transportation / intermediate process product / studies chain / chemical / metal products / economic processing variability samples / sample intermediate metal products / chemical method / extract metal / sub-unit products / metal product / grade supporting equipment / end-user sampling protocol / saleable product / chemicals / basic technology / /