Hey guys, this is Jason with Mount Baker Mining and Metals and today we're back
in Sudan and we're testing some tailings out through one of our hammer mills onto
a gold Kacha, and then we're gonna clean up the concentrates from the gold
Kacha on one of our shaker tables. And our goal here is to take the tailings
from some of the cone mills or wet pan mills that the locals are using now, run
them through, concentrate them down and see how much gold and mercury we can
recover. The material is falling from the hammer mill down into the gold Kacha,
which is a spinning concentrating bowl, and here the tailings are coming out
down into the sluice, which really is just acting more like a trough to get
the tailings out into the tailings pond here. And here in a minute we'll get the
hammer mill opened up take a look and then we'll clean out the concentrates
from the gold Kacha and run them on the shaker table to see how much mercury
recovered.
Here's the inside of one of the small 12x9s, and the hammers are wearing a
little bit here, yeah? And do you ever have problems with the pins wearing or the
rotors wearing> It doesn't look like it. A
0.5 millimeter screen? (Off camera: 0.4) Jason: 0.4?
So this is, this is the gold Kacha. (Off camera: Yes, this is the
concentrate) Jason: concentrate... and this is from tailings from the cone mills. So looks like a
it packs up the riffles pretty good huh?
Yeah so what's this now? Sudanese man speaking: this is the concentrate here, and this is like a plug
so it doesn't go all the way down. Jason: Oh I see. Sudanese man: there is a lot of concentrate as well. Much of the materials should be inside
here. Jason: Okay, and so it feeds in from the hammer mill into the gold Kacha
and the bowl is spinning and the material flows up the sides and out the top. And
then you have the sluice to check the tailings.
How fast does the bowl spin? 90 RPM. So it doesn't go very fast at all. And it's
maybe two feet in diameter at the top... 20 inches to 24 inches at the top. And it's a
single-phase motor it's the screen but then it's also I didn't realize this
until it's a yeah two funnel foot open it yeah okay so that feeds down into the
middle spread it into the ball and that's where the most the best
concentrates are in the bowl and then anything flows out has to go up to the
roof let's get out
now he's taking the concentrates from the gold catcher here and running them
on the shaker table to upgrade them
from the water down all of that
yes really
yeah here what a big relief was really a big flaw yeah yeah
I'm gonna put the PR machine
thing is if they have like leaks I'd get more than a good one it's about you are
they were honest about this I knew or should I get up there is some way to put
it behind me here - yeah all the way along and lunatic machine yeah
I
you see when we put it like this you can't see what's in black sand
yeah
every time I do nothing
you think it
I had tons of mercury don't pour too so as this is this typical of the amount of
mercury you see and the bags yes so this is every every two bags will have about
this much mercury yes Wow sometimes more the normally find it
means the source was Ichiko okay if you don't find me okay tailings means all
you know source was pouring on okay
we've taken the concentrates that we brush down off the table and now they're
panning out the last bits of sand and material and we'll get clean mercury
that they can then squeeze the gold out of and we can weigh the mercury to find
out how much mercury recovered as well as the gold bead once we get the gold
cleaned from the mercury now they're adding dilute nitric acid to coalesce
the mercury into a single bead as well as clean some of the impurities from the
remaining concentrates
so they don't burn the picture here these nitrogen-nitrogen salsa so tell me
again about the nitric you put the nitric in with the mercury in the
concentrates and it collects all the mercury together
yeah even the flower mercury everything brings it all but it's not used it takes
the iron out and some things like that but it's how you can find you see what
after this process the city of the dance yeah okay okay yeah iron nitrate yeah
yeah yeah he's gonna clean it up real nice and now we can take that and weigh
it can we get this Wade Atlas at the gold buyer or something
it's okay pour it in DME pour it in here I think we get a picture in okay so what
do we have here we ran 150 to 200 kilograms of tailings we've got mercury
recovered here and we're gonna try and weigh it and figure out how much mercury
we have ever come from 200 grams we're not we're not really quite sure how this
process is gonna work but our goal is to get a weight on the mercury and a weight
on the gold
oh no honey much total weight yes and then squeeze it okay yeah okay
okay so the dish weighs thirty two point five grams 50 point five so there's 18
grams of stuff in there yeah a little bit of blacks and mostly mercury by
weight okay now we can squeeze it out and weigh the mercury again we're going
with the information we can get yeah
go with the flow
optimist music and when they temper use it they would do yeah yeah that's all
mercury that we removed from the environment at this point because it's
just tailings
so now can we get another weight on this mercury yes go away that mercury yeah
okay so there's the mercury recovered
all right all the mercury we can out of the rag here's our mercury we're gonna
go away our clean mercury and see how much mercury we recovered from 150 to
200 kilograms 45.5 so there's there's 13 grams of mercury - no yes
13 grams 32.5 yes 45:25 so yeah 13 grams of mercury yeah and here's the final
results we ended up with 13 grams of mercury from about a hundred and fifty
kilograms of tailings so if you stretch that out and in one ton of tailings
there's about 85 to 90 grams of mercury that we can recover on our shaker table
and then here's the gold amalgam that we recovered and again from that 150
kilograms we recovered point six grams of gold and so in one ton of tailings
there's around four grams of gold to be recovered that was lost by the cone
Mills
you