With all due respect here is a portion of your post

Newmont bought recently  a gold mine in Mexico with an in situe Metals value of about $4.5 Billion and paid $2.2 Billion...approx 50% value of the in known reserves

I read "gold mine" quite clearly which most certainly implies that a good portion of infrastructure costs have already been met ie.roads/rail,power,mining equip.,mill,housing etc.,etc.Newmont bought all of that PLUS the in-situ resource.

cs