fwiw, here's my simplified math based on recent discussion from Mark Bristow, Barrick; start about 2:25 to 5:10 for shorter version.
https://www.youtube.com/watch?v=4T5-XL4BJi8
(this was posted a few days ago)
cough up 5m oz, become Tier 1 worthy, then they are interested.
(whereas in the bottom 1/2 of cost curve, able to produce 500,000oz yr for 10 years)
current operating mines are always exploring, expanding and adding resource.
mmKay ?