Hi,
I'm new as member. I couldn't sit on the sidelines anymore. I have been doing a lot or reading and have decided to go rebuild my riffles. I have a 10"x48" sluice that I converted into a highbanker. I used a Cal sluice hopper that I made my own spray bar on and cut the opening bigger in the bottom to allow more water. I am running it with a 2" pump. I built a fine gold recovery area under the hopper using lath expanded metal on miners moss on black matting and 1/16" heavy gauge weaved wire classifier. I also have 4' of 14" abs truck bed liner drop riffle at the end.
The existing riffles consist of 3 flat bar riffle followed by 3 hungarian riffles. With the water flow I want to run the amount of material I want, there is too much turbulence off each riffle and the down stream side of the riffles are packing instead of a active exchanged created by a strong vortex. I think I have decided to weld up new riffles based on the clarkston report, http://www.arcticminers.org/Clarkso...rication.com/files/sluice-build-partIII-2.pdf. I know the easy answer is less water lower pitch but that wouldn't be any fun at all.
I know I am going to get some flack for this but I think hungarians and flat bar riffle are a major design flaw in sluices unless you are running fairly low velocities. I know they have their place but they are all to often used in high velocity high volume highbankers and dredges that require something far more aggressive. read the research and let me know what you think.
I also have 20' of 8" channel with 6" sides I was thinking of making a 10' 8" highbanker out of using 1" clarkston riffles. there are several studies that show to increase capture area you should long not wide. so I was thinking long narrow with tall aggressive riffles, high water volume, high velocities.
Let me know what you think, changes, comments, love it, hate it, fry me if you must. I am looking for any thoughts on this at all. I dont think I will stop thinking about it until I build something.Thanks for having me.
I'm new as member. I couldn't sit on the sidelines anymore. I have been doing a lot or reading and have decided to go rebuild my riffles. I have a 10"x48" sluice that I converted into a highbanker. I used a Cal sluice hopper that I made my own spray bar on and cut the opening bigger in the bottom to allow more water. I am running it with a 2" pump. I built a fine gold recovery area under the hopper using lath expanded metal on miners moss on black matting and 1/16" heavy gauge weaved wire classifier. I also have 4' of 14" abs truck bed liner drop riffle at the end.
The existing riffles consist of 3 flat bar riffle followed by 3 hungarian riffles. With the water flow I want to run the amount of material I want, there is too much turbulence off each riffle and the down stream side of the riffles are packing instead of a active exchanged created by a strong vortex. I think I have decided to weld up new riffles based on the clarkston report, http://www.arcticminers.org/Clarkso...rication.com/files/sluice-build-partIII-2.pdf. I know the easy answer is less water lower pitch but that wouldn't be any fun at all.
I know I am going to get some flack for this but I think hungarians and flat bar riffle are a major design flaw in sluices unless you are running fairly low velocities. I know they have their place but they are all to often used in high velocity high volume highbankers and dredges that require something far more aggressive. read the research and let me know what you think.
I also have 20' of 8" channel with 6" sides I was thinking of making a 10' 8" highbanker out of using 1" clarkston riffles. there are several studies that show to increase capture area you should long not wide. so I was thinking long narrow with tall aggressive riffles, high water volume, high velocities.
Let me know what you think, changes, comments, love it, hate it, fry me if you must. I am looking for any thoughts on this at all. I dont think I will stop thinking about it until I build something.Thanks for having me.
