SI
SI
discoversearch

We've detected that you're using an ad content blocking browser plug-in or feature. Ads provide a critical source of revenue to the continued operation of Silicon Investor.  We ask that you disable ad blocking while on Silicon Investor in the best interests of our community.  If you are not using an ad blocker but are still receiving this message, make sure your browser's tracking protection is set to the 'standard' level.
Gold/Mining/Energy : Naxos Resources (NAXOF) -- Ignore unavailable to you. Want to Upgrade?


To: Jerry in Omaha who wrote (7225)12/13/1997 8:04:00 PM
From: Lonnie  Respond to of 20681
 
To all:

No word of Naxos in the Vancouver Sun from Baines. Noticed a very small article in the Post or Sun stating that Dolbear certifies that Delgratia has no gold...big surprise.



To: Jerry in Omaha who wrote (7225)12/13/1997 9:22:00 PM
From: sh  Read Replies (2) | Respond to of 20681
 
Knight, Jerard,

I'm grateful for the links. I read the Hoyt article with great interest. I believe I read it at the time it was posted but could not appreciate it because of my very limited knowledge of this area. The goldbug site, although hard on the eyes, gave me a nice summary of the cyanide and fire assay processes. I decided to put off the Chemex site for now, but will certainly get to it later. Bottom line seems to be that you indeed come up with the precious metal, if it exists, at the end of the fire assay process. That brings me back to Ledoux's reluctance to certify its results now. I'm sure the process involved in getting the ore transfigured to the so-called simple state that makes it susceptible to standard fire assaying is very complicated. It has taken the experts at Ledoux months to learn it and, hopefully, become adept at utilizing it. However, since they are able to get measurable precious metals in hand, I still find it difficult to understand their reluctance to unequivocally affirm this through certification now. I know they have a stellar reputation to guard but when you have the goods in hand, what greater proof does one need? Are they worried about consistency? Are there political forces at work that caused the hesitancy? Was there a concern with some type of contamination? I guess anyone of these factors or maybe others could have caused the (hopefully) temporary hesitance. If consistency was the sole concern, there shouldn't have been a problem in immediately certifying these results and adding that further testing is being done to confirm the consistency of the presence of gold in the samples at issue. In any case, it will be interesting to see how this drama unfolds.

Thanks again,

sh



To: Jerry in Omaha who wrote (7225)12/16/1997 12:05:00 AM
From: sh  Read Replies (1) | Respond to of 20681
 
Gerard,

I was able to get my single post "crash course" in basic mining from Mr. Greg John. Mining novices like myself will find it educational. Mr. John can be reached at nxr123@aol.com, although give the gentleman a break with your e-mails, I'm sure he's got a lot to deal with already.

"Hi! I read your questions on the thread. My name is
Greg John and I take care of the operations down here
at Death Valley Junction (just north of the Franklin Lake
Playa.) I'll try to answer your questions briefly, since you
probably have found most of the answers on-line already.
But, just in case, this e-mail might clarify some points.

Really, the distinction between the terms assay and
recovery come from traditional mining. For example, let
us consider gold. A standard fire assay for gold takes
about 30 grams (technically approx. 29.167 grams, which
is termed an assay ton) of ground ore and mixes it with
a flux usually composed of litharge (lead oxide - lead is
the "collector" of the gold), borax, sand (silica), flour
(or some such carbon source - carbon "reduces" the
lead and precious metals from their positive valance
or oxidation states to their neutral or zero oxidation
metallic state), and other ingredients. Fundamentally,
the flux lowers the melting temperature of the ore and
the lead collects the gold out of the ore. Sometimes an
inquart or addition of silver or gold is added to aid the
lead in collecting the gold.The gold is then gotten out
of the lead by a process called cupellation. The lead
is "sucked" into the cupel, leaving a gold + silver bead.
This bead is analysed for its gold content either by
separation or by disolving and reading the solution
using an atomic absorption machine or ICP, &c.; naturally,
if an inquart was used, that amount must be numerically
subtracted.
The fundamental point, is that a standard lead
fire assay such as this is not an economical
method of extracting gold from the ore.
In traditional mining, a recovery process is a economical
method of extracting gold from the ore, such as cyanide
leaching. Typically, however, cyanide leaching does not
extract as much gold out of the ore as a fire assay. Usually,
recovery methods extract on the order of 80% of the gold
that can be extracted by assay methods. It is not impossible,
though, to get as high as 97% recovery efficiency.
So the assay essentially gives you a benchmark to measure
the efficiency of recovery.

The terms assay and recovery can become
undifferentiated when the assay method is
economical; i.e., it is a recovery method.

Industry standard for evaluating an ore body is still standard
fire assay. So one approach is to treat the ore to make is
fire assayable. Thus satisfying industry standard. Another
approach is to go straight to production. Thus showing large
scale extraction.

The Johnson Process seems to be the key to making the
Franklin Lake material fire assayable and to be a recovery
process. Testing continues.

Please feel free to e-mail if you have any more questions
or comments. I hope this has been helpful.

Greg"

One of the issues that came to mind is the possibility of innocent contamination if "gold is added to aid the lead in collecting the gold" and the addition is not calculated into the reading properly. However, with the professionalism of Ledoux, a very unlikely scenario to say the least. Given the complexity of the process, I would surmise that the hire-ups at Ledoux simply wanted a re-test to make sure everything was exact given what's at stake here.

Best regards,

sh