New throw screen for 2016 season fianlly finished

[Jimnyjerry]

The metal mark II version of my throw screen is sitting in the shed sulking.

Finally put a new screen together for FN Qld and the sapphire fields.

[Jamo]

Jerry (or others), do you reckon something like this might work ok 'in stream' to speed up processing gravel?

[Lapis Lupinus]

Yeah, good question Jamo. I'd like to know too

[nuggethill]

Have you tried to load it up Jerry,
the only way to test it is to try it in
a creek and see if it does the job
I also would be interested to know how well it works
regards Harry

[Jimnyjerry]

Jerry (or others), do you reckon something like this might work ok 'in stream' to speed up processing gravel?

Not really would clag up with wet gravel.

Only work in a stream if it was changed and set up horizontal and below water level. Really looking at a table with two or more removable sieves with at least a 4 inch gap between them all set up below water level.

[Findem]

In most creeks it's the sand you want to remove to get at the gems. The gravel is the easy part.

[Jimnyjerry]

In most creeks it's the sand you want to remove to get at the gems. The gravel is the easy part.

True John. 

A throw screen only works well with dry material. Sand goes through and the nice gravels slide into the appropriate bucket for sorting or washing depending if I am chasing topaz or sapphires. 

[Tripz]

Looking good Jerry, what size fine mesh did you use?

[Jimnyjerry]

Tripz got a 4 mm gap between the wires for the screen by overlaying two 10 mm gap screens. Also did some wire tying. 

Will try to chase up a 3.5 mm gap one up Rubyvale / Sapphire / Emerald area to replace it. Just need a piece 14 inches by 33 inches to replace it if the original does not work out.

[Lefty]

Looks good Jerry.

I've made two and their best use is definitely with dry, friable material. Mine has worked well at Lowmead (amethyst) where the ground is mostly just decomposed granite sand and also at Mount Gibson (topaz) where the ground is very rocky but the soil between the rocks is fine, powdery and ashy - both types go straight through without difficulty but if the ground is clayey it would have difficulty.

[mangomick]

Hi Jerry
Your hinges on the front legs have got me stumped. It looks like  they allow the legs to  hinge back against the screen which means you have to put the  gutter or channel for the larger rocks on later and the way the hinges look like they are hung, won't they, if you throw a large shovel full of rock and dirt at the screen, open and collapse the sieve ? Maybe you don't stand back and shovel your wash like a madman into the throw up sieve from a  distance like I do in which case if you are pouring it in gently it probably wouldn't collapse . .

[Jimnyjerry]

The hinges on the front legs a have a catch on the back that locks them onto the frame of the screen. 

I did not give away all my secrets in the photo. 

 

[Jimnyjerry]

Maybe you don't stand back and shovel your wash like a madman into the throw up sieve from a  distance like I do ...

Have been known to throw gravel at the screen like a madman. 

Sometimes I even miss with some of it. 

[mangomick]

Cheers Jerry 

[Tripz]

Maybe you don't stand back and shovel your wash like a madman into the throw up sieve from a  distance like I do ...

Have been known to throw gravel at the screen like a madman. 

Sometimes I even miss with some of it. 

I`m lucky to get 2 out of 3 always miss so had to design(er, copy from club)one that I run a full bucket through in one go. Put 4mm in bottom couldn't get 3.25 so not for sapphires. Works great everywhere else though. Forgot how to put picci in here but it is in Gallery under my little helper.
 
 



(Edited by admin to add the photo)