Ok that is the Box Athona. What they want to do is crush and grind light on a .06 ounce ore at 6,000 tons per day, mining light underground, and gravity separate the ore and leach the con with 85% recovery at perhaps 40 mesh.
Will it work? Well, maybe. First none of these people are mining engineers of gray hair and long rep. They are not fast draws in the mineral business. They are promoters and fancy prospectors. Not stupid, but not experts at gravity machines. I am not Einstein of minerals but I forgot more about gold recovery than any of those guys will ever know.
If they were serious and smart they would have a rod mill and a small 100 TPD pilot plant up there trying various cheap and dirty but effective things like the campbell jig, the YT12 jig, the knelson et al.
My bet is they will fail to make money. They say 85% but I will bet they have ground and dilution problems just from sheer incompetence of the kind that killed Agnew Lake. It will also cost them more than they think to develop and mine. Development could be 10 million. The mill could be 8.
It could be this bad.. .05 head, 60% recovery and that is .03. That is 15 bucks. Can they mine and mill etc for 15 bucks a short ton? hmmmmm
They are looking for 25.50. (85% of .06) Sounds like they will need it.
Can you get 80% out by gravity in some ore? Sure you can. But you can also eff it up too. That is even easier.
In order to get that (25.50), presuming they have it, they need real assaying, real engineering and real mill innovation and control. Have they got it? Maybe.
Maybe not.
Personally the way to do it, is to SAG grind at 25,000 tons per day, and float/gravity to get 94%. That would do it, but they haven't got the money to do that.
Another trick would be to crush photo/electro upgrade the ore at 75% recovery at 10K tons per day, if it would work, to say 4 times the grade, the grind/float and/or leach that.***
Yanks did that in Alaska on a .05 ore at 50K tons per day underground and it worked.
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