Drop Riffles, was wondering.....

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	Drop Riffles, was wondering..... « on: February 04, 2011, 10:44:28 pm »

So, while the weather's still quite chilly, the conversation has come around to drop riffles. From the drawing you can see what I'm wondering. I dont expect absolutes, but was wondering what you guys may have figured out, if there is any documentation as to what these should be? Ex:, I'm thinking the the angle should probably be the same, or close, to the same angle as the riffles on the sluice.

Angle A, what is the angle of the riffle?
Height B, how deep should the drop be?
Distance between, meaning how wide should the drop be?
Flat area, meaning how far between the drops?

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	Re: Drop Riffles, was wondering..... « Reply #1 on: February 05, 2011, 10:14:05 am »

I've never used the Drop type.

I would assume that they work pretty much the same way creating A bit of Boiling action down in the Drop like a regular Riffle.

I would build mine in the same fashion as the Hungarian type.

Drop Riffles Spacing about 4-6 " apart.

3/4 to 1" Deep.

As with any sluice, it's going to depend on the water flow.

It's my understanding that they are better about loosing Fine gold.. The fine gold does not blow through the sluice as much.

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	Re: Drop Riffles, was wondering..... « Reply #2 on: February 08, 2011, 12:40:05 pm »

First you need to think of how that riffle works. We know how hungarian riffles work; the current flowing over the riffles creates a back eddy underneath the riffle that constantly keeps the aggregate agitated settling the gold to the bottom. From what I can tell, that particular riffle design appears to act on the fact that gold "crawls" along the bottom in a given current. In your riffle design, it appears the gold moves along the bottom and falls into the drop riffle. The reason this works is because the drop riffle creates a dead spot in the current where there is literally no current. There may be a little bit of a back eddy in there, but not enough to really perform any sorting action. Mind you this is all speculation from looking at your design, however I think I am pretty close to right. I personally would not use this design as a potential problem would be easily clogged riffles resulting in lost gold. I am pleased with the hungarian design and don't plan to change the design, on add to it. If you do try this riffle style, record a video of it and get some close ups of the riffles as they are working.

Thanks

Sean

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	Re: Drop Riffles, was wondering..... « Reply #3 on: February 09, 2011, 05:05:35 pm »

Hey guys, thanks for the input. Looking at it as a potential project, and if we do it, will definitely take videos.

Thanks.

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	Re: Drop Riffles, was wondering..... « Reply #4 on: March 01, 2011, 01:00:33 pm »

So I saw a video online (prospectingchannel.com) where a guy was using a drop riffle... so now I understand. The sluice is designed for incredibly slow water flow and seemed very effective. Does anyone know who makes a small packable version in plastic?

Cheers

Sean

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	Re: Drop Riffles, was wondering..... « Reply #5 on: March 01, 2011, 04:50:54 pm »

Sean, try the Henry Henry sluice.

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You normally don't need to take along wood if you are in an area where you can staple it to a fallen tree trunk or branch. A guy I know used pieces of plastic 4in gutter down pipe that fit together with connector joiners and then tied the sluice tube to the 5ft of pipe using wire ties. He drilled holes into the down pipe to accommodate the wire ties and when using it, he filled the pipe with small pebbles to anchor it in the stream. Worked very well and easily transportable. I never saw any reason not to use the less expensive round PVC pipe instead. You'd have to drill some large gateways into the side to allow stabilizer feet which would stop it from rolling. Very light stuff.

Here's an idea that just came to me. Find some PVC that has the right inside diameter to glue down your sluice tube after you split them both lengthwise. Then use outside couplings to connect several small segments of the PVC with the tubing glued inside. Full round couplings would add strength to the split PVC and if each segment was about 18in, the whole thing would fit into a backpack and weigh next to nothing.

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	Re: Drop Riffles, was wondering..... « Reply #6 on: March 01, 2011, 05:06:51 pm »

I use a peace of PVC Gutter and just put some indoor outdoor carpet on the bottom. Not as good as the Henry but works quite well.

It's only 3ft long and 85% of the Black sands go Buy, Buy!

Never found any gold below the 1/3 mark.

Cheesy

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	Re: Drop Riffles, was wondering..... « Reply #7 on: March 06, 2011, 03:58:39 pm »

We have in Canada a prospecting website forum that is chocked full of diy stuff. It is called Canadian Gold Prospecting Forum. If can access this you can find almost anything you want to find out about hunting gold. Take care and happy prospecting. Harold

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	Re: Drop Riffles, was wondering..... « Reply #8 on: March 24, 2011, 10:44:41 pm »

I have a Angus McKirk sluice that I really like!! It is small enough to pack anywhere that I want to go and does remarkably well with fine gold.

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