"Shears" can be constructed of 1- or 2-inch-thick boards 12 feet long nailed to pairs of tripods so that the boards slope back from the water flow at an angle of about 60 degrees. The tripods are built in such a way that boulders can be piled inside the base to hold them in place.
The sluice boxes in the days of the 49'ers were very similar to the ones of today. The primary difference is the construction and materials.
Even though this test sluice was built from scrap it is extremely precise with respect to shape and we went to great lengths to insure that the bottom was absolutely flat and that the sides were at accurate 90-degree angles. The bottom ended up being so flat that most
When setting up a sluice the proper angle must be observed. It's usually between 5 - 7 degrees of slope and should allow most round rocks and pebbles to pass through easily. You don't want the material zipping through but rather kind of tumbling through slowly.
the sluice angle indicator's use is to assist the amateur / recreational gold prospector in setting the angle on his / her sluice box. No claim is made as to how much more or …
Dec 28, 2010· "Regular or modified angle iron riffles should have a 40-60mm. gap and be tilted at 15 degrees upstream of the sluice box's vertical in a sluice run, with a slope of 12-15 degrees. Packing and extreme gold loss were often observed when any of the following conditions occurred: Shallow slopes, narrow gaps between riffles, excessive feed ...
Recirculating Sluice System Evolution ... (about 5 degrees down), which worked fine, and glued the pipes together such that the holes were all in the same plane to squirt straight across the screen to insure the entire screen is covered. ... Good sluice angle and flow.
This system is ran by the natural flow of water by placing the Underflow river sluice in the water current at a 5-10 degree angle depending upon size of material being processed through the sluice (keep slickplate slightly higher).
Gold Highbanker Tips page. # ... Get an angle indicator app for your phone. Then set your upper box at 9 – 11 degrees and your lower box at 6 degrees. That's a good "starting point". These pitches will vary with each operator based on water flow and material being run.
For most sluice or highbankers it really doesn't. You can control the flow, depth, pitch, etc, and create the perfect action. However, if you have a high volume dredge, where it is difficult to control water flows, volume and depth, then we suggest you keep your current riffles …
How to SIZE a Sluice BoxThis week I went and asked "how to SIZE a sluice box" to the crew on a large gold prospector forum and other sluice or gravity gold recovery 'experts' and gathered the list of emails and Find this Pin and more on mining stuff by Ricardo Morales.
As a general rule, the optimum slope-setting of a sluice is around one inch of drop per linear foot of box. This can change, depending upon the volume and velocity of water being used, and/or the average shape, size, volume or weight (specific gravity) of material that you are processing.
Start running materials, by putting dirt and sands on the top of the slickplate (set the mini highbanker at a slight angle 3-10 degrees to help with waterflow). You will notice the unwanted material passing through the adjustable underflow traps set at 1 1/2" .
In this discussion, I am mainly talking about the size of riffles. Because, the bigger (deeper) the riffle, the greater ... So initially, we are dealing with a water-force through the sluice box that will wash 4.5-inck rocks all the way through. That is a lot of force. And the force is turbulent.
It is installed from the end of the shovel-inbox down to the end of the first sluice box, at a 45 degree angle. The sand and gravel mixed with water in the shovel-in box pour over the grizzly, and the finer materials drop into the sluice box, while the coarser materials roll off onto the dump.
This week I went and asked "how to SIZE a sluice box" to the crew on a large gold prospector forum and other sluice or gravity gold recovery 'experts' and gathered the list of emails and forum posts here below. As you will see, in summary, most can optimize or troubleshoot a sluice box but few or none can size a gold sluice box.
The angle gauge is a versatile device in the sense that it can reliably record inside, outside and reverse angles. To get started using one, all you have to do is set the tool on a flat reference surface, press the zero button to calibrate it, then begin measuring angles.
The grizzly is a set of parallel bars placed at a 45 degree angle over the main sluice box, which filter out larger material. Reply. angle of riffles in a sluice boand - solohardware.in.
Jul 22, 2012· On a 10" wide sluice, you will notice rooster tails angling towards the center of the sluice. The longer the sluice, the more you will see at intervals down the sluice. These rooster tails create more turbulence in the area directly below them and for a distance downstream.
Water speed / velocity, angle / pitch of the sluice box, amount of water / water depth in sluice. Why would we LUMP all of this together? Because in a way, it all works together and has the same impact "across the board" on all riffles, boxes, and behaviors.
Radial Sluice Gate . ... The gate opening is usually measured in metres above the sill, but an angular opening (in degrees) may also be chosen. An angle of 0° indicates that the gate chord (the gate is represented by a circle segment) is horizontal and below the pivot.
Power Sluices / Highbankers A power sluice or highbanker is basically a sluice box with height and mobility and is motorized. It is mounted on a 4-legged stand that gives the sluice box the correct slope.
angle dredge sluice. Search dredge sluice box riffle angle to find your need. Search dredge sluice box riffle angle to find your need. Zenith Mining and Construction Machinery is a …
Feb 12, 2011· This equates to roughly 1 degree of sluice box angle, and is the correct starting location for dredging. The corrected sluice box angle can only be determined after running quite a bit of material through the dredge.
Dec 02, 2012· A protractor is what you are looking for. There are 360 degrees in a circle. 180 in a semi-circle A protractor has the degrees drawn on it. So if you use a level bubble to find your bottom edge plane for the protractor, then the angle on the sluice can be measured in degrees.
Test your sluice recovery and angle with one of our gold concentrate bags. Loaded with gold it will allow you to practice at home before going out on the river. Loaded with gold it will allow you to practice at home before going out on the river.
ANGLE: The sluice has been tested from 2 degrees through 25 degrees, and performs admirably throughout that range. This sluice has even been operated at a 45 degree angle and still captured gold, including fine gold.
Sep 04, 2014· I do however keep my bottom half at roughly 15 degrees, but I made my sluice without measuring, all by eye, so its a very rough 15. 3 inches per foot as mentioned above is probably a better guide to stick to though
The sluice should be fitted with either angle iron or bent flat bar riffles as described in the text, riffle spacing of 2" for angle iron and 3" for flat bar; Water may have to be introduced and should not be less than 10 gpm / cubic
Start with your main sluice about 9 degrees, then play with the pitch based on your water flow. ... Watch the videos and Doc talks about the header box angle and wash time. DON'T try and get clay balls to break down in the header box. Most clay balls take 20 minutes + to break down. If you want to break them down, treat them differently ...
Apr 05, 2012· How to properly setup, adjust, and operate a sluice box.
Mar 08, 2012· about 30 degrees incline maybe a little more. "volume" of water should not effect performance, the more the better. most people usualy have there incline to low. if it's stuffing up with anything other than black sand it needs to be higher. if it seems to be stuffing up still, try letting your sluice rest with clean water for a second, to clear it.