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Gold/Mining/Energy : Gold and Silver Juniors, Mid-tiers and Producers -- Ignore unavailable to you. Want to Upgrade?

To: E. Charters who wrote (68113)	11/24/2009 1:00:56 AM
From: E. Charters	Respond to of 78426

There may be some herrings au rouge in my conclusories on that piece on the metallurgy given that there were two different tech reports quoted, from 2006 and 2009. The approach has changed a tad since the early one. I do mean "a tad". It has seen no major differences in approach just more advanced work. A few things. 1. The Angostura overall grade is low, open pit type grade. 1.4 grams. They do however have a lot of the stuff. 142 million tons or more. 2. There is talk about bioleaching. Before you reach for the sell button, this technique was tried and Brewery creek and works to a degree. Everything in metallurgy is in degrees, and percents so nothing to fear. Brewery Creek had weather and low gold price problem. Not so here. 3. The sulfides unless you treat them in plant, so far have pretty low recovery. Overall or bulk recoveries in my opinion are guess work primarily because I think they ignore the high grade shoot concept. 4. High grade shoots are so far not well defined by drilling or bulk testing. In fact they are pretty hazily calculated. If you don't know what you got, how do you know much you are getting out? 5. Are the high grade shoots high sulfide? I think they need some pretty aggressive bulk grinding tests before they sign off on grade et al. Of course grinding the sulfide, or fresh ore and working its con by roasting (I like the idea) and cyaniding would get much better recoveries than heap leaching. When its more than 3% sulfide I think the recovery goes down to 30%. So it points to get aggressive with heap ferric sulphate bacteria leaching, or bio heap leaching or take it indoors. I don't think they are done, or should be making easy pronouncements about being done. More work is called for. They can't let the sulfides win. Just down the road, or over the mountain, Ventana_in_the_Valley has higher grade. It looks like high grade underground. No word on metallurgy yet, but high grade wrassles a lot of recovery demon to the ground. EC<:-}