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people online in the last 1 minutes - 0 members, 0 anon and 0 guests. (Most ever was 29 at 13:36:32 Sat Aug 3 2002)


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shaftsinkerawcRe: Gold jigs - pictures/diagrams
Any updates?
baubRe: Gold jigs - pictures/diagrams
I think you may have the backround to do the tedious testing and records keeping needed to successfully figger it out.

Here's some tips that a Texas miner passed on to me while back:

Classification will help you tune your sluices for a narrower range of material therefore upping your efficiency. The tighter the classification, the higher the recovery. From then it's time versus additional gold recovered.
Use wetting agents to battle the surface tension of the wash water. Consider reusing your water to retain this surfactant and reduce your water cost. Keeps the soap etc out of the stream too.
Keep your cons wet. If they dry out they are more likely to float out when you first start out to final concentrate 'em.
Different sizes and shapes of gold behave differently.
Figure what your ares has in these factors.

shaftsinkerawcRe: Gold jigs - pictures/diagrams
Where are you located? Where will you be doing your shop work? Something to keep in mind is the pre-screening necessary for efficient operation.
bjvoorRe: Gold jigs - pictures/diagrams
My bad! I know what I want! Why isn't it obvious to everyone else?

I'm a retired guy with more time than sense (but unfortunately, little cash). I'm a technologist rather than a prospector - although if I found a wad of gold I wouldn't throw it back in the river. I plan to run some tests this summer with some controlled and video-taped experiments with various configurations of sluices - and carefully controlled feed stock (all w/in various classified size ranges - any individual run would have an upper and lower range of particle sizes).

Why? Because all I've read/learned/seen/experienced says that sluices are very efficient at getting gold if it isn't too small - and at smaller than some (?) size ANY gravity collection system will get SOME of the small to very small stuff (-100 mesh? -50 mesh? -that's a question for another post) and the rest goes right out with the tails.

There are some folks that have elaborate "blue bowl" systems that I'd bet get A LOT of the tiny stuff - if you're willing to spend your life running and rerunning your cons. But is there an easier quicker way of testing how much exits the sluice (of whatever flavor you choose).

I thought a jig (home made to be as efficient for -50 gold as possible) would be an interesting tool to have. Vacuum up the settled sluice tailings and see what comes out. Also some kind of centrifuge might be interesting, too. (another post is in there somewhere).

So... a small scale (36" or smaller - probably round) jig designed for small size pre-screened material is my ticket! Not tons per hour - recreational prospector grade operation.
But I would like to be able to quantitatively "bunk" or "debunk" some of the ideas and products floating on U-tube, etc.

And, by the way, thanks! for the previous postings!

baubRe: Gold jigs - pictures/diagrams
Very nice.

Thanks Leonard
leonardRe: Gold jigs - pictures/diagrams

Gold output from jig before panning. Black is cassiterite. It was mined in the area.

Roughing jig no water.

Slots in the bottom of the jig. They were around 1/8" by 1 1/4". Anything larger stayed on the deck for a cleanup at the end of the year or when it started showing up.

Finishing jigs.

Finishing jigs.

Waste outlet panned.

leonardRe: Gold jigs - pictures/diagrams
I was at a plant that used jigs exclusively in 2008.

"They are often used for base metal recovery, such as cassiterite"

That is what they used as a jigging agent.

Main roughing jig is on the upper left.

Jig plant in background. Trommel is on the right out of the picture. Concentrates from trommel are pumped with a slurry pump to the jigs.

Main jig on top. Inlet is large pipe to the left.

Finishing jigs. There are 2 of them.

Roughing jig.

Other side. Trommel in far background.

Finishing jig on left. Large hose is waste outlet.

shaftsinkerawcRe: Gold jigs - pictures/diagrams
As stated,we don't know exactly what you're looking for. Search here on the forum has some stuff on the Keene Hydramatic Jig.
aussco999Re: Gold jigs - pictures/diagrams
Hey bjvoor:

Like most gravity recovery equipment, mineral jigs are very efficient, but not in every application. They are often used for base metal recovery, such as cassiterite.

Some benifits of jigs are; small equipment foot print, high processing capacity, medium water requirments and low man-power supervision.

With the proper set-up, jigs can be used for precious metal recovery, down to about the 150 mesh range. You can also use jigs in a rougher, scavenger and cleaner configuration.

Without knowing more info on what your jig needs are (hobby,placer, hardrock), I can only pass along some general internet info;





Post what you are trying to do and maybe we can come up with some more specific info.

Good luck, :smile:

bjvoorGold jigs - pictures/diagrams
I don't want to reinvent the wheel but there seems no straightforward way to "access the wisdom of the sages" -and search previous postings:

1. diagrqams/drawings of various types of jigs: Idaho, pulsator (water pulse driven - several on Utube), American balance, etc.
2. size of screen mesh (or punch plate) under the ball layer
3 depth of same layer
4 would BBs work?
5. ideas for the diaphragm (if a "diaphragm under" design)
6. all those 100's of questions I haven't thought of....

I don't necessarily want the answers directly (although I'd take them!) - but Google's not cutting it!

references - URLs - books(?) - I've tried the sources I can think of - it's not like I wnat to be handed this stuff on a platter.... And I HAVE been all the way through the current and archive files - although for a different subject - took me a week but LOADS of GREAT stuff - just hard to easily access!

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