Cubfan64,
Chew it up if you don't mind. I would like to read your take on the results and the approach. Honestly, I think that it is a shot right between the ears, but you might see something that is problematic with the material.
Hal, would you by chance be comfortable posting or forwarding a copy of the spreadsheet with results? I would love to see that.
I'm a chemist, not a geologist, so I can only really approach this stuff from one perspective. There are a few things that confuse me a little bit:
1) The term anomalous is used in many places in the e-mail - I generally use the term to mean something like "unexpected." I can't tell if the e-mail author is using it the to mean the same thing in all cases.
2) I'm not clear as to why the author differentiates between Au, Sn and W (for example) not being mobile while elements like Ag, Cu and Pb are? Again this might be a geology thing I'm missing, but it seems to me that all of those elements could be "mobile" when exposed to weathering. It can't be a density thing because Pb and Ag are more dense than Sn. Could it be because the other elements he listed that he considers "mobile" exist as decomposed ions in stream water, whereas Au, Sn and W are not? Just not sure.
3) I'm also not completely clear as to how the pie plots are being made - I think I get it, but if I see the spreadsheet, I think it will make more sense.
I will say two things though regarding the data:
1) As a general rule, when it comes to any sort of analysis of materials, the first and foremost step is ALWAYS sampling - if you don't get good, representative samples, no matter how good your analysis and interpretation is, you have the chance of drawing incorrect conclusions. Without having been there when samples were collected and just going by the e-mail, I would say they did a better than average job of planning and executing the sampling. A geologist might disagree, but I think it looks reasonable.
2) The way they treated the samples and analyzed them looks very reasonable to me. It would probably have been better to pulverize the samples rather than just screening them to a certain size, however the plan seemed to be looking for evidence of metal elements in the highly weathered portions, so again what they did seems reasonable.
Pretty cool - wish I lived out there and had access to all the instrumentation I have where I work now - I could go on a sampling spree and map the whole mountains for elements. Now THAT sounds like it would be a TON of fun!!