What do you think about this? ( blue bowl screening)

[rocky99]

I'm thinking of screening at 30 mesh and make a lot of runs in the blue bowl. Leaving the waste in my 5 gallon bucket and then coming back after there is enough to justify rescreening at 50 and 100 for additional runs.

 

[arizau]

You will probably save time if you screen first but save the rejects separately for rainy day running. The first runs of each size will likely catch most of the gold if you have the bowl tuned right. There is a huge difference (about double from size to size) in the various sizes and you are not likely to catch the majority of the smaller gold even in multiple runs when running it with larger material if that is what you are shooting for.

Good luck.

 

[B H Prospector]

If your cons are classified down to at least -20 continue classifying -30, -50, -100 by stacking all of your screens on a bucket. Then dump each sized cons into it's own container and keep the material wet. Anything larger than -30 can be panned or further processed by other means. Then run each through the blue bowl separately with the water set to run at the rim when running -30, drop water 1/4" when running -50 and drop the water level another 1/4" when running -100. There will be no need to run any of the material any further. All your gold will be separated and left in the bowl if you use these settings. I have used the Blue Bowl for yars and have never lost any gold using this method.

Go for the gold

 

[Goldwasher]

screen to 1/8. if you have any gold over 1/8 you will already know.

sit and spend some time with that pan and a snuffer. Swirl tap and snuff as much gold as you can out as you can see. If your not dredging you shouldn't have to mauch cons to do this.

Set that snuffer aside.

Now screen to 30. screen that with a 50 screen and the minus with a 100 mesh screen.

start with your blue Bowl at the lowest flow. about 3/8 below lip. Add your 100 cons.
the waste will run out pretty quickly if your flow is right.
Stop flow by turning off/disconnecting pump power. Depending on the amount of gold there will be a bit laying right where it dropped and the rest around the cone.

use a new snuffer to push the gold into one spot and snuff it up.

The reason I do It this way is that it is easier to control your flow up than down

Bowl back on. Now it's the -50 same process. Then the -30

You need to make sure you introduce your cons wet and at the serial number. You want the water at a speed per batch to where the majority of the gold spreads and stays in a spray pattern from where you introduce to a 1/4 of the bowl away. The gold will sit and the heavies pull towards the cone and out.

If you have it at such a speed that everything goes to the cone quickly you can lose gold and end up with material build up.

For + 30 you will have heavies that are not going to leave the bowl. If you did your first pan swirl gold removal right you really shouldn't find to much in your +30

Now take your first gold snuffer and your blue bowl snuffer combine and repeat the blue bowl process. Doing it with mainly gold is way faster. But splitting the process like this makes it much faster as a whole.

I also have a snuffer I use to suck out pesky heavies that stay in the bowl.

 

[n01d3x]

Are you introducing cons while the blue bowl is running?

 

[Goldwasher]

yes always

 

[n01d3x]

I'm going to have to try that!