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Bear'sPa
post Jul 10 2014, 07:58 AM
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Thanks, i've seen a few pics on other sites. I'm thinking of cutting a one or two very shallow grooves in it too. Just a few microns deep, Kinda like a mirror i once had. It worked well on fine material
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Caveman
post Jul 10 2014, 08:48 PM
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You will have to post more than a few pics when you get it running.


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Bear'sPa
post Jul 17 2014, 06:54 AM
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I got started on the millers table, cut some slate to 8" at inlet 16" at the base. I then cut small grooves at the top and bottom. That might have been a mistake, it seems that at a low flow they get clogged up with silt (heavy clay). But no worries I got lots more slate I can use. 600 gph pump with a shutoff valve seems to be big enough, But you have to have the patience of Job! here is a build pics.
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Yoda
post May 4 2015, 10:51 AM
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Nice work! I really love that you got a hold of real good quality slate.

I have tried various methods of miller tables in the past, but never have been so lucky as to be able to get a hold of some prime, real slate that is flat like a chalk board. Which means all mine have performed sub-par at best.

All I can add for you is that you are right: the grooves will do more to hinder than help, in fact they will facilitate eddies which is supposed to be a no-no with miller tables as they can throw the 100 mesh and smaller gold. The slate should do the traction action, and otherwise you want to aim for a glassy water surface, no more. If the water flow was high enough to create a true riffle effect (giving the grooves a purpose other than attempting to act as a drop trap), you would simply wind up blowing the gold from too much force, cancelling any benefit.

One idea you might want to try is instead is to measure and cut a small "deposit" hole up top, with a funnel and jar or such suspended below it. This way you can just sweep up exposed gold into the hole for collection, and grab the container when finished.

I hope this helps in some way, I imagine if you are this far along you have done a great deal of research and there is little I can add. But I'd love an update if there is any since last year.


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