ill take a stab at it.Im not a pro but I have seen sales of mines.
basicly it pretty much depends on ammount of gold,concentrations,accessability
ammount being the area of land that has minable gold
concentrations,,oz.grams,per ton or lesser ppb
access is ease of mining
get all data,,do the math then you have idea of worth of mine and shares
just my opinion
Illigitimus non tatum carbarundum 