"Jufel: You said it yourself...they are just leases."
Thanks for acknowledging the word Leases actually the word should be say SUBLEASES!. Bad on Me.
And I still think they are worth hundred Million US Dollars. There is a former post today on Inferred Reserves . You might take a look on that info and use it as a first step to find out how to value a Gold Asset. Good luck in you homework.