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To: Digrdug who wrote (28572)10/1/2002 10:34:30 AM
From: Jim Bishop  Read Replies (1) | Respond to of 34075
 
Here it is, LOL I parsed the post though...learned that from, an expert.

To:Keith Hodgins who wrote (28472)
From: Digrdug Monday, Sep 30, 2002 9:53 PM
View Replies (2) | Respond to of 28575

Keith “the Doug thing” can actually answer some of your questions!
“how dirt goes in at one end and gold comes out of the other end”
One gram to the tonne (metric tonne = 2200 lbs) is one part per million. Not much! So the dirt (fine material) is separated out of the larger stuff, the “overs”. The fine material is then beat up to clean the sticky clay off of the gold particles and then the gold is taken out using gravity. Gold is about 18 times the density of water and the dirt is only about twice the density. The whole works is sloshed around in water in various machines until the gold comes out the bottom and all the other stuff goes out the top.

“isn't the gold, once separated, pure gold?”
It is pure metal but not pure gold. The gold mined in that area is about 90% gold with the rest being mostly silver and copper. It can be made directly into jewelry without being refined, only diluted.

“why would it have to be assayed or whatever?”
The buyers only pay for the gold content, we give them the rest.

”once whatever it is that is getting separated comes out the other end, then what?”
It is all of the heavy metal particles and a bunch of dirt sand etc. This is separated out by various measures and then is smelted into a “dore” bar. A propane furnace melts the material and various fluxes are introduced to get the metal to spit out impurities that do not go into solution (Chemistry 11). After a while in the furnace the metal is poured into a mold to make a bar. This is taken to the buyer and samples are drilled out for assay. The seller gets about a gram for a check assay if they think it is necessary.



To: Digrdug who wrote (28572)10/1/2002 10:59:47 AM
From: Keith Hodgins  Respond to of 34075
 
Hi DigrDoug

Thanks for the information. It does help! That's my whole point. No animosity, name calling, etc. We can treat each other with respect and be cordial on this thread. I really appreciate your taking the time to answer my questions. If anyone wants to clarify, dispute, or add to your information,that's all well and good. At least we will be learning and providing information in the process.

Keith

P.S. Nothing derogatory meant by "the Doug Thing" Just meant that it's taking over the thread in a negative way and not letting anything else get done.