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Gold/Mining/Energy : Queenstake Resources (QTR.T)
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To: the Chief who wrote (1942)2/8/1999 1:59:00 PM
From: E. Charters  Read Replies (1) of 2249
 
They had some alteration. Now that is a maybe. but some geos can detect when that alteration is good and bad. It is hard to tell. I have seem wonderfully altered rock and good looking veins and no gold whatsoever. Generally of you find high temperature quartz it is a good sign. I am not sure of crystabolite and trydymite occur in these systems though. It seems that is all we hear these days. High sulfidation epithermal stuff. I would like to hear more about specifically what alteration minerals they saw and what sort of rocks where in the area. I know you can drill and drill at all sorts of stuff in the Andes and come up with nothing. BHP did that for 100's of holes. Sometimes as in the Diablillos the alteration was barren but they found stuff at depth after drilling blind CSAMT targets. But the hole count was exhaustive.

What I like to see is high temp pyrite and smectite, chlorite, carbonate and sericite. They call that phyllic and argillaceous alteration. Then if silver gold, mercury, antimony and arsenic are anomalous on the surface we can say there is mineral system. Generally you will get a gold halo with Mobile Metal Ion geochem. Also carbonitazation should be high as you approach the deposit. Late stage brecciation and intrusion fracturation should be evident. Silver should be high right over the deposit. You should be able to pan gold in the nearby streams. It might improve their chances.

There is usually an indications of sulphide or iron oxide minerals, Elevated copper should show a way too. I note that lateritic soils, if developed, have pronounced gold highs in the region. They are hard to interpret as they may smear or concentrate alternately depending on conditions.

Here is an example of a good geological workup on a region with
some info about alteration.

mineletter.com

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