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Post by oldpanner on Jul 6, 2015 20:02:01 GMT 10
Thinking along the lines of making a hammer mill or rock crusher to crush the stuff that doesn't make it through the classifier screen.
My logic is that if there is fine gold in my area, then the gold came from the bigger rocks originally and there may be some gold still in the larger rocks.
Just wondering if anyone has had any luck with hammering or crushing to extract the gold.
I probably will make a hammer mill just because I like making things and it might work. I figure the big companies made stampers for a reason.
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Post by Flying Scott on Jul 6, 2015 21:01:58 GMT 10
Yes, why not give it a go.
If you don't get results in the first 6 months give it up as a bad exercise
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bonza
Gold Digger
Posts: 71
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Post by bonza on Jul 7, 2015 19:32:36 GMT 10
back in the day the old timers used a dolly pot and a dolly, bit like a mortar and pestle, to crush bits of gold bearing ore and the like during sampling and whenever they may have stumbled upon a reef prior to setting up proper crushing machinery.
I found a dolly pot out on the gold fields between Walhalla and Woods Point years ago and although rusty was in good condition and I still use it with a 40mm steel bar as a pestle. very well made being a solid cast steel unit.
you can make a dolly pot out of 6" steel pipe about 6" long with a 6mm - 10mm base welded to it. place a rock in there and bash away with the dolly till its ground up as sand then pan off
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Post by donnybrook on Jul 21, 2015 13:48:57 GMT 10
Use a tow ball (super hard) welded to a piece of pipe. Should work well. Crush some samples. You will not be able to see a great deal of gold in sulphides. Its best to have an assay done. You are probably not familiar with the CLS Leach which involves roasting the material to convert it to an oxide. The CLS process can then be undertaken. Again you need the proper gear (ORP meter buy it on eBay in China) to keep the pH at abut 8.5 for a period of time. You then filter it and add SMB (beer sterilizer) which will drop the gold back as a gold sulphide either as a black,brown or mustard coloured powder.It may not co precipitate other metals which can give you a false gold result. Sodium Sulfite which swimming pool suppliers sell will only bring down gold. Go onto the Gold Refining Forum in the USA. Look for donnybrook there as I give a good description of that process and another (Iodine Leaching). Also purchase a book from Action Mining in the USA. It gives a lot of information on the various processes under CLS Leaching. Again you need the proper gear safety etc. Look at Basement Chemistry by Williams and the Halide processes. Perhaps then build a hammer mill. I did give someone some plans for that( a hammer mill) on this Forum but not sure who?
Donny
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Post by shivan on Jul 22, 2015 19:13:16 GMT 10
I have had a bit of luck crushing, nothing special but have found gold. Had more luck crushing samples from old hard rock mines than i have from alluvial rocks though. I would try crushing a few with a dolly pot before making a mill though.
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nuggethill
God of the Goldfields
A 4 1/2 oz find at Kingower by a friend
Posts: 519 
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Post by nuggethill on Jul 26, 2015 14:20:01 GMT 10
I use a home made dolly pot and dolly,
dolly pot
4" across 18" long steel pipe welded to a flat steel plate
The inside weld is ground smooth
lid with a hole
dolly
a cut section of an old crow bar
with the shoulders rounded at the ends (sharp edge at the ends rounded off)
this can be cut to suit
I've recover over 4 oz of gold from quartz species using this so far
regards Harry P.S. most of these species were crushed with the home made dolly pot, the large piece of quartz to the left shed 1 oz of gold 
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