Bazooka flow question

[utah mason]

I have a question for you bazooka experts. Look at this flow over the Grizzles. The tubes in the trap were exposed. I think, I read in a past thread that if the tubes were exposed it is scrubbing the box out. The clean out wasn't what I was expecting ( compared to last time I dug in this hole, it was much, much less). Did the hole give out or did I just send the gold further down the river
https://youtu.be/0aH53zKC_9A

 

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[Au dave]

I'm no expert ..but IMO it looks like you have too much drop...put the front end in a little deeper and prop up the tail. I have found using my homemade zook it runs better with water 3/4 up the sides on the slickplate and if air gets under the top plate behind the grizzlies it tends to scrub out the trap ...hope this helps

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[Goodyguy]

Appears to have too much angle. (could be optical illusion?)
I see water gushing over the grizzly. (not good)

My advice is try to keep the sluice more level and slightly deeper as the previous post advised.
If the sluice was fairly level and not set at too steep of an angle as it appears in the video then the scouring could be due to too much flow.

* re watched the video and the flow looked good. But the angle looked too steep.
Here is a crude drawing of what a trap looks like at level and at a 45 degree angle.

As the angle increases more scouring occurs, you still catch some gold but the fluidizing will not be as efficient due to less back pressure on the exposed jets causing a weaker fluidizing effect at the end where all the material has gathered.

The more level you can keep the Bazooka the better when the flow is sufficient. However, a steeper than level angle is required to make up for too weak of a flow making a steeper angle in that case beneficial.





GG~

 

[OwenT]

I can pretty much always feel the tops of my tubes, not sure if that's "bad" or not. Flat as you can without being too slow. And remember, think less, shovel more

 

[KevinInColorado]

I'm no expert ..but IMO it looks like you have too much drop...put the front end in a little deeper and prop up the tail. I have found using my homemade zook it runs better with water 3/4 up the sides on the slickplate and if air gets under the top plate behind the grizzlies it tends to scrub out the trap ...hope this helps

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AU Dave clearly understates his expertise...he is right-on here. Get the upstream end a bit deeper in the water to avoid air getting under the top plate after the grizzly and you'll be fine. It might be a bit too steep but that's not your main problem here.

Sadly, yes you moved the gold further downstream Live and learn.

 

[Au dave]

AU Dave clearly understates his expertise...he is right-on here. Get the upstream end a bit deeper in the water to avoid air getting under the top plate after the grizzly and you'll be fine. It might be a bit too steep but that's not your main problem here.

Sadly, yes you moved the gold further downstream Live and learn.

Thanks KinC I owe my knowledge to you , Goodguy, Tnet posts and the 2 dozen sluicing runs testing my homemade "zook"[emoji4]

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[utah mason]

I can pretty much always feel the tops of my tubes, not sure if that's "bad" or not. Flat as you can without being too slow. And remember, think less, shovel more

I think I read on another post a while ago that if the tops of the tubes were exposed it is washing the materials out. I could be remembering that wrong tho.

 

[utah mason]

Thanks everyone! I'll get it flatter and deeper next time. I'm hoping to get a day out soon. My wife had been in India on business, so that really cut into my prospecting time. I took a drive at lunch and went to see if I could get back to small canyon I was prospecting at the end of last season. Found good decent color at each spot I tested( decent for Utah). I was really excited when I got to first snow drift section and no snow. Got past the next 2 sections I knew would have drifts. Man I was starting to get excited now, then I came to F.S. gate. It was open. Now I'm am super excited. Finally get to impassable snow, but I'm short walk from canyon. My excitement would not last. As I got to the creek it was still 3-5 feet under snow : ( I could hear water running under snow, so it shouldn't be long. There are a couple of spots lower down were the canyon is wider and gets more sun. So hopefully there is some exposed running water lower.

 

[KevinInColorado]

I think I read on another post a while ago that if the tops of the tubes were exposed it is washing the materials out. I could be remembering that wrong tho.

You are remembering correctly.