MBMMLLC.com: ASSAY RESULTS!! Gold, silver, copper recovery from PCB’s using a shaker table

MBMMLLC.com: ASSAY RESULTS!! Gold, silver, copper recovery from PCB’s using a shaker table

We have some ground up printed circuit board material that was sent to us, we are going to run it on the little 2 foot shaker table the tailings here which is going to primarily fiberglass, glass strands, epoxy, resin and the plastic material we are going to capture that in the pillow case bucket here and than next to it is the concentrates or midlings trough thats going to have mostly copper and soder in it and than on the end with have the third hole on this table which is the high grade number one hole we are going to run this material and see how it turns out Now we are really getting some pretty nice separation down here we have our light material, the grey green is our printed circuit board material coming across the grooves we have a lot fo the copper and than and out the longer grooves coming up under the water bar we have mostly what I think is soder and I expect after a little bit we will have some gold coming out as well Now we have some gold coming down the table right at the leading edge of the grey material and I think that’s going to increase as we continue on over here on the left we have primarily copper and soder further down over here we have material flowing down over the grooves The very light material, it’s the glass strands and epoxy resin and that is going to the waste tailings Now we are at the leading edge right under the water bar and down most of this we got a show of fine gold most of the copper is coming down here into our concetrates trough there is a good view of the blue green fiberglass epoxy material that is mainly the board material. here is an overall view of the separation right up on the far left we have a thin yellow gold line and than a thick grey line right behind it and than further to the right you have the separation of some of the sodder and the copper and than far to the right is the blue green, epoxy fiberrglass material Here is the gold out of the number one hole there is a lot of that grey material down there and there is a close up look at it we have received our assay results back from the shaker table test we ran we sent our samples off to American Analytical in Osborne Idaho, they are our assayers, they do a great job We did a 48 element ICP and some fire assays with the precious metals with a ICP finish as you can see, there is a lot of information here, I’ll just scan over it real quick the elements that were tested are listed there in parts per million as we get down here to the bottom there is the gold, silver platinum, palladium and rhodium That were fire assayed and the platinum, palladium and rhodium were ICP finished and I will go over the percent recovery of the shaker table first and than I will review how I ended up coverting ounce per ton and parts per million to percent recovery I have picked out the metals that I was interested in The list there is on the top going from left to right is gold, silver, platinum, palladium and than aluminum and down here is in pounds as well, so aluminum, copper, iron, nickel, lead antimony, tin tanallium, titanium and zinc and here along the bottom are the percent recoveries we combined the high grade and the concentrates to find the percent recovery, gold was 85% silver 98% platinum 89% palladium 87% aluminum 28% but that’s not surprising because aluminum is light and not worth that much copper 97% iron 82%, nickel 96% lead 92% This was a surprising one, antimony was only 18% tin 92% titanium 78% and zinc 89% Those are the overall results of the shaker table test we are very pleased with the percent recoveries. We think these can also be increased by fine tuning the table and a even feed will help maybe some adjustments to the table tilt Those are the overall results now I will go into detail about how I calculated. the percent recovery and we can take a look at just how I got these numbers Here is a sample calculation, we are going to figure out the percent recovery of platinum from our PCB test using our shaker table and these are the three bags we sent into the assay office these are your dry weights in grams these are the results of the assay, bag 1 had 0.342 troy ounces per ton bag 2, 0.048 troy ounces per ton bag 3, 0.006 troy ounces per ton and both of these were given to me by the assay report To find percent recovery we take our bag weights our sample weights and convert them from grams into short tons were in the United States, we use short tons which are 2,000 pounds per ton There are 907,185 grams in a short ton so the grams go away and you end up with short tons these are all very small numbers than you can multiply your troy ounces per ton by how many tons your sample weighed and you end up with true metal in that sample, so there was 1.3 I’ve gone to scientific notation 1.3 times 10 to the negative fourth troy ounces of platinum in bag number one I’ve done that for both bag number one and bag number three and this is the key right here, this is the total amount of metal in troy ounces in all three samples, all three sample bags combined you end up with 2.5 times 10 to the negative 4 troy ounces Now we can ifnd out our percent recovery you take the amount of metal in bag number one and divided it by the total amount of metal in all three samples bag number one had 52% recovery of the platinum bag number two had 36% recovery of the platinum and the final bag which was the tailings we had 11% loss, I had recovery but it’s loss because it went to waste when you add up bag one and bag two 52 and 36, a little rounding error in there you end up with 89% recovery That is my calculations for percent recovery and using a spread sheet, I did that for all the metals we saw that earlier, so that is the that’s how I got too the numbers we are really impressed on the recovery for all the metals we assayed for I appreciate all your support and feedback from you guys a lot of guys have been really interested in what we are doing Stay tuned for more videos and we will catch you on the next one, thanks!


  1. Where these naked boards? Did he send them to you crushed or did you crush them for him? I am probably misunderstanding this, but the material comes out to 45 Toz per ton Au? So if you crushed up a ton of this material you would theoretically pull 45 Toz Au along with the other metals?

  2. love the videos keep them coming, would love my own shaker table but cant find one small enough for the room i have and dont seem to be many suppliers in uk 

  3. I totally love this, and thank you for the videos you do.  As far tweaking the table, personally, I think it's probably dialed in pretty well right now.  Minus 30 mesh isn't all that small and most of your precious metals are very thin coatings on otherwise non-valuable materials such as plastics or foils.  Any gold or platinum coating that is still left on a piece of light material won't add enough weight to change its course on the table.  I think you'll find that to increase recovery much you'll have to make smaller pieces… and then the extra processing cost might outweigh the extra recovery.

  4. fluoroboric acid extraction will remove all the solder and then simply all the components will fall out.  So at that point you'll have a pile of depopulated boards with copper tracings and a pile of loose parts.  Many of the components will be worth more intact than they are worth ground up.  Then grind up the depopulated boards and make copper sulfate with a sulferic acid extraction.  Electrowin to recover the copper.

  5. So are you saying at 4:45 you can recover anywhere from 1 to 45 troy ounces of gold & other metals per ton of PCB grindings?

  6. found your videos yesterday and i have to say GREAT JOB. first time i have seen assay #'s put to PCB's. Was very interested to see what % of material is in those things. I have not seen all your videos yet but i will. Quick question for when you have time. do you offer a service or sell the equipment? As a hobbyist of every thing you do 😉 , that shaker table would be awesome along with a smaller hammer mill. mind you i don't plan on making a living out of it. i had more questions but cant think of them right now. will ping you later maybe. keep up the great vids. Subscribed.

  7. You are doing God's work here… More and more I'm learning how to separate one non-ferrous metal from another, since ferrous is pretty simple with the use of a magnet. Could "Eddy Currents" also be employed to further refine the process???

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