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Dear wondererIt all depends what information is contained at the pre feasibility level.Truly, to arrive to pre feasibility, you have had to complete geophysics, geochem, initial trenching to establish hot zones.Then drill establish the ore body and turn into metallurgy for feasibility.Minimum "entry level" 43101 able to go into feasibility expenses.Then you have to define the ore body.Is it oxide? sulphide, quartz veins, disseminated, Placer, alluvial, colluvial?most certainly, proximity to city, strategic areas or parks will be a hindrance if no eco technologies are considered.The farther you are from economic centers, the higher the grade of the ore body has to be, unless you are going for low grade high volume porphyrys.What characteristics does your lay meet? hectares? roads? accessibility? drilled? sampled? defined?based on all of the above, a feasibility study may take as low as 1 year and and as long as two years, as shortly thereafter is positive production - read financing - decision.cheers