My 2cents.
Depends on holding period you are looking at.
Management, management, management. (Experience is huge)
Then cash and ability to raise financing to get into production, improve production, finance acquisitions in this beaten down market etc.
Are the expectations consistent with market averages for the type of mining, open pit, underground, gold, silver etc.?
Is the country stable that the prospect is in?
Check the share structure. Warrants, options to management etc.
Expected need for dilution.
Liquidity.