Gold mine exploration is challenging and complex. It requires significant time, financial resources and expertise in many disciplines such as geography, geology, chemistry and engineering.
The likelihood of a discovery leading to a mine being developed is very low - less than 0.1% of prospected sites will lead to a productive mine. And only 10% of global gold deposits contain sufficient gold to justify further development.
Once basic facts about the local geology and potentially viable deposit are established, the ore body can be modelled and its feasibility assessed.