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Author Topic: north saskatchewan river  (Read 157 times)

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Offline the gold guy

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north saskatchewan river
« on: January 13, 2020, 02:53:24 PM »
What is the purity of the north Saskatchewan river placer gold?

Offline Youngnugget(Goo)

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Re: north saskatchewan river
« Reply #1 on: January 13, 2020, 09:10:51 PM »
Is the gold fine on the NSR or coarse, cant say ive ever seen gold from it before

Offline oilfieldsafety

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Re: north saskatchewan river
« Reply #2 on: January 16, 2020, 07:46:23 AM »
I forget the exact purity but I believe that it is in the low to mid 90% range.

As for the size the grand majority is very fine flour but pay attention and check your oversize material when classifying as once in a blue moon there is a larger flake or picker to be had.

Offline JOE S (INDY)

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Re: north saskatchewan river
« Reply #3 on: January 16, 2020, 10:26:34 AM »
Generally, with exceptions of course, if the Gold is very small then the surface 'layer' has had some (or most) of the non Gold metals (usually Silver and Copper) naturally leached out over time.  Since tiny Gold has a much higher % of surface area, as compared to the same weight of larger chunks, the result is that powder sized Gold *~usually~* is noticeably more pure compared to larger sizes.

Just a simple physics thing.   [&whistle#]

One other point - Placer Gold in a stream often comes from entirely different source areas - with the natural alloy varying by it's source area.  If that is the case then that is another factor to put into the equation.

Back in the olden days, when I was first starting out, I worked in an area South of Anchorage.  That area (Erickson's Crow Creek Mine, Girdwood, AK) had a number of glaciers wander through in the long ago and each glacier brought with it Gold from two, distinct areas.  It was an easily seen fact that there were two varieties of Gold there - One redder (more Copper) and one paler (more Silver).  In addition there was a marked difference in the usual size of Gold from both sources.   Sometimes there was a full mix of the two types and sometimes, depending on the circumstances long ago, two distinct catchment areas were to be found - often determined by where the creek deposited the latest Gold over time.

Joe

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