RE: Other metals in GGP7 Feb 2023 12:19
Hi IPad
Gold and silver will be extracted first and formed into Dore bars which should contain about 70% gold a bit of silver and maybe 25% iron.
I’ve never found out what happens to theatre iron.
From the gravity and flotation processes the rest of the minerals are in the sludge and sent to the copper concentrate flotation circuit.
Copper concentrate when sent to the processors contains about 35% copper, 30% iron and the rest mainly sulphur.
They have to remove the iron sulphides from the concentrate.
This forms a matte of a rough copper plate which contains other minerals, could be called blister copper.
This plate is turned into an anode by electrolysis in a solution
A mineral sludge is formed at the bottom of the solution.
The anode is then turned into a cathode copper plate 99.6% copper and any sludge again falls to the bottom.
This sludge contains all the credits including gold, silver, cobalt, chrome,zinc, lead and others.
Nickel is a different process but similar to the copper flotation
Tin needs to be retrieved in the gold circuit, the ore is crushed and ground several times just before the flotation process and is found in the sludge and removed prior to the copper process.
Fly in the ointment is the bismuth as other mineral’s especially gold and silver dissolve into it and has to be separated. This is where the new addition to the Telfer train comes in , they’ve added some sort of magnetic device to remove bismuth. Normally nitric acid separates them but they’re not doing that for whatever chemical reason.
That’s just the way I see things, others may have different opinions but it’s all a big chemistry experiment to get the best out of the ore