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PostSubject: New Banjo   Wed 27 Apr 2016, 9:24 pm

New Banjo

Hi all I have been a tad busy I am replacing a banjo that will be going bush in a very short while. Some 15 odd years ago I worked an area on the Shoalhaven that gave me wonderful gold and it is now time for a rework of that area. But it is a 3 km walk and everything must be taken in. So I have an old Banjo at home that is nearing the end of its days so it will be a one way trip for it. Here is what I have been up to.

Photo 1

This shows the bottom hopper 700cm long 20 wide with the water break and the top hopper 550cm long 19 cm wide at the bottom.



Photo 2,3 & 4

This shows different aspects of the two sections.







Photo 5 & 6

This shows how to cut the top hopper out for the fitting of the punch plate.





Photo 7

This shows the punch plate fitted.



Photo 8, 9 & 10

This gives a side and bottom view of the bottom hopper.








Photo 11, 13, 14, 15 &16

This shows the top hopper a work in progress











Photo 17, 18 & 19

This shows the unit matched top hopper onto bottom hopper







This is the build so far the whole unit is 1 mm out of square which I am very happy with, there are no twist in the top hopper nor the bottom hopper. Both these point must be looked at if you are buying a readymade Banker Twist in the hoppers will throw your water one way or the other and make the wash run to one side or the other.  That is why look before you buy. As I do more I will add to this. Cheers James
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dam it
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PostSubject: Re: New Banjo   Thu 28 Apr 2016, 7:22 am

thumbs up goodjob
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findthecolor
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PostSubject: nice    Thu 28 Apr 2016, 7:49 am

Nice build mate, would love to see this beauty in action.
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Outlander
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PostSubject: Re: New Banjo   Thu 28 Apr 2016, 2:47 pm

Geez that's an awesome build Jimmy. She should shoot straight as an arrow! Are you going to paint her all up in your flagship colours or is this one going to be unique?? thumbs up
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PostSubject: Re: New Banjo   Thu 28 Apr 2016, 7:46 pm

Yep the build is going well, the unit will end up been 7 kg all up. And yep it will get the paint job. I seal all my joints with a building grade adhesive. Why I do this is to stop fine sand getting into the joints and it works well at doing just that. I have been unable to get the matting i usually use so i have gone back to the miners moss which i am not fussed on but it will do the job until i come across the type of mat i need.









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YJ
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PostSubject: Re: New Banjo   Fri 29 Apr 2016, 6:21 pm

Looking good. udaman

Is that Miners Moss, or eyebrow clippings? rolflmao
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PostSubject: Re: New Banjo   Fri 29 Apr 2016, 7:46 pm

Nar their in me pillow. lol!
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findthecolor
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PostSubject: Nice mate   Sat 30 Apr 2016, 9:30 am

Nice mate, how does that gold try work and what sort of matting are you looking for.?
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PostSubject: Re: New Banjo   Sat 30 Apr 2016, 12:44 pm

The gold tray just lifts out at any stage of operation and replaced at any time without having shut down time. 90% of all gold in the unit is placed in that tray therefor when testing poor areas the tray comes in very handy. cheers I picked up a bit today which is good but i have to reline the second last riffle it is out on one side bugger. Crying or Very sad
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YJ
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PostSubject: Re: New Banjo   Sat 30 Apr 2016, 12:45 pm

Bunnings in Fyshwick had the mats 2 weeks ago, but I forgot to grab 2 for my new build too. Mad

Too busy drooling because I was at a Bunnings. Shocked
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PostSubject: Re: New Banjo   Sat 30 Apr 2016, 12:50 pm

Yep looked at them they had bubbles of rubber on the bottom scratch bugger
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findthecolor
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PostSubject: ok   Sat 30 Apr 2016, 2:46 pm

Ok thanks James, the gold trap sounds good, and good on ya for yesterday looks we both had a good day.

Mate have you got any pics of that matting you're after, and I can have a look around up here for you.
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findthecolor
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PostSubject: Re: New Banjo   Sat 30 Apr 2016, 2:53 pm

James wrote:
The gold tray just lifts out at any stage of operation and replaced at any time without having shut down time. 90% of all gold in the unit is placed in that tray therefor when testing poor areas the tray comes in very handy. cheers I picked up a bit today which is good but i have to reline the second last riffle it is out on one side bugger. Crying or Very sad  

Yeah I can see that riffle down a bit on the right from the photo I reckon, is that what you're talking about?
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PostSubject: Re: New Banjo   Sat 30 Apr 2016, 4:02 pm

Yep thats the sucker all fixed now. Very Happy Very Happy
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YJ
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PostSubject: Re: New Banjo   Sat 30 Apr 2016, 4:36 pm

James wrote:
Yep looked at them they had bubbles of rubber on the bottom scratch bugger

Don't think you can get the old type anymore, I fix that with 120grit on an orbital sander.
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PostSubject: Re: New Banjo   Sat 30 Apr 2016, 6:52 pm

findthecolor wrote:
Ok thanks James, the gold trap sounds good, and good on ya for yesterday looks we both had a good day.

Mate have you got any pics of that matting you're after, and I can have a look around up here for you.

Thanks mate the mat has been sorted thumbs up
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PostSubject: Re: New Banjo   Sat 30 Apr 2016, 6:54 pm

YJ wrote:
James wrote:
Yep looked at them they had bubbles of rubber on the bottom scratch bugger

Don't think you can get the old type anymore, I fix that with 120grit on an orbital sander.

lol! that is exactly what i did i will use the moss as backup if needed. Wink

If anyone need miners moss the proper stuff let me know. cheers
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PostSubject: Re: New Banjo   Sat 30 Apr 2016, 8:38 pm

James wrote:
YJ wrote:
James wrote:
Yep looked at them they had bubbles of rubber on the bottom scratch bugger

Don't think you can get the old type anymore, I fix that with 120grit on an orbital sander.

lol! that is exactly what i did i will use the moss as backup if needed. Wink

If anyone need miners moss the proper stuff let me know. cheers

Thanks James.
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PostSubject: Re: New Banjo   Sun 01 May 2016, 5:21 pm

The first photo shows the top hopper adjustment supports. Adjustment holes are set at ½ inch spacing.



This photo shows how I am setting up my riffles and matting. Riffles 1.2&3 are placed so no water will blow under the riffle. Riffles numbered 5 water will blow under them. Number  6 shows all the riffle system counter sunk about 4 mil what you cant see is how under each round hole there is a concave of about 3 mil.

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PostSubject: Re: New Banjo   Sun 01 May 2016, 11:53 pm

What is the benefit or effect of allowing water to blow under a riffle?
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PostSubject: Re: New Banjo   Mon 02 May 2016, 7:30 am

If the water blows under the very first and last riffle you will lose a great percentage of your gold. So i have 3 that are enclosed so water cant do that. Having the riffles counter sunk also is a great benefit. Water blowing under a riffle will counter act that riffles effect so why put a riffle there you may ask. The answer would be to slow the wash passing through the unit given time for the sands to separate and the fine gold to settle. If you place riffles over bread crate or the larger expanded mesh the same will happen you got to watch that. thumbs up
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PostSubject: very interesting   Mon 02 May 2016, 8:23 am

Thanks James. so interesting, didn't know that about riffles. And is that round rubber stuff the matting you were after?
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PostSubject: Re: New Banjo   Mon 02 May 2016, 4:36 pm

Sure is mate but the bottom of the mate has to be dead flat. Then i work the mate from there but i been bogged down the last few days and unable to get back to the build. bugger.
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findthecolor
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PostSubject: mat   Mon 02 May 2016, 6:53 pm

Mate if you like I'll look around up here, take a pic of what I find at bunnings, or maybe Masters, then upload it here as I know your phone can't accept pictures.

Does it have to be that hexagonal shape or round do?

How's that?
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PostSubject: Re: New Banjo   Mon 02 May 2016, 7:27 pm

Thanks mate i appreciate your offer but i got one. Thanks mate. thumbs up
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