From what I saw at the mill, they are getting clear and complete separation of the light (quartz, etc.) and heavy components (gold, silver minerals, etc.)
Concentrate is 100% gold and silver?
There may be some copper in the gold (it looked a bit more orange than pure gold), but based on historical production of the mountain it should be primarily gold and silver (as acanthite, or silver sulfide), with little other heavies such as lead. So yes, I think the concentrate will be close to 100% gold and silver (acanthite). I used 1 oz of gold as a rough estimate, but if you run the numbers, and account for the sulfur present, you get 0.8 oz Au. So you can multiply my numbers by 0.8 if you want. But that's just the gold. If you add in the silver, it will bring it right back up to around 1 oz Au eq.
That's based on my observations and historical data. If you have better information, let me know and I'll use that.
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