Assaying, Microscopy, Mineralogy & XRF/XRD

Assaying, Microscopy, Mineralogy & XRF/XRD 2017-04-04T06:57:57+00:00
  • To participate in the 911Metallurgist Forums, be sure to JOINLOGIN
  • Use Add New Topic to ask a New Question/Discussion about Assaying, Microscopy, Mineralogy & XRF/XRD.
  • OR Select a Topic that Interests you.
  • Use Add Reply = to Reply/Participate in a Topic/Discussion (most frequent).
    Using Add Reply allows you to Attach Images or PDF files and provide a more complete input.
  • Use Add Comment = to comment on someone else’s Reply in an already active Topic/Discussion.

0.6 ppm gold in fire assay of milky quartz and XRF result of tonnes of slag (2 replies)

quwannar
8 months ago
quwannar 8 months ago

Hi all,

I live in Black Sea Region of Turkey. I found huge amount melting slags that I thought it belonged to an ancient mystery mine. in order to find out which metal was processed, I sent the slag samples to XRF analysis. Results are below.

Fe; 13.3 %, Cu; 1.83 %, Mn; 0.08 %, Co; trace, Ni; 0.002 % Zn; 0.03 %, Pb; 0.05 %

Au; < 0.1 ppm and Ag; 7.8 ppm.

When looking at Au result, It seems to be under the detection limit of XRF analysis capability. They say that this means that gold may exist or not in slag. They also say that gold may be below 10 ppm or ıt won't exist at all. finally Fire assay must be done for slags. But if we theoretically consider and compare Ag result of 7.8 ppm and co-occurrence with a gold, There probably is an anomaly between silver and gold amount in the slag. So, what is the sub-limit of detection for the gold in XRF method?

I also found a milky quartz vein nearby slag heap.  I sent it to Acmelab for fire assay. The result is 0.642 ppm. No visible gold in my pan.

So Should I go for further gold prospection like drilling where quartz vein I found according these value?

Any comment would be appreciated.

Erdem

Rheomet
8 months ago
Rheomet 8 months ago
1 like by David

Hi Erdem,

Suggest repeat the gold and silver by fire assay with AA finish, duplicate at least, and, preferably, use a reputable lab. I would also make sure that their method is validated. This would prove more prudent compared to expensive drilling based on one XRF result, a method at least questionable when it comes to Au/Ag.  

Cheers, Alex.

max skinner
8 months ago
max skinner 8 months ago

Rheomet, is correct. XRF on material this low grade is not good. I my lab, I would run control type fire assay, at least in triplicate. If it is very important I run 6 assays, throw out the high and low and average the 4, this will give you a very good assay. As Rheomet says use a reputable lab which is very important if you want a correct answer.    Max

Please join and login to participate and leave a comment.

 

BUY Laboratory & Small Plant Process Equipment

We have all the laboratory and plant equipment you need to test or build/operate your plant.

ENTER our Mining Equipment' Store

We Sell EQUIPMENT for all types of Mineral Treatment PROCESSES and Laboratory Testing needs

Have a Mineral Processing QUESTION?

Come in, ask your question

911Metallurgist Community Forums

Talk to other metallurgists and be helped.

Need ENGINEERING Services or Plant TROUBLESHOOTING?

We can IMPROVE ALL PLANTS / Mineral Processing Engineering & LABORATORY Ore Testing

911Metallurgy Engineering

Contact us for process engineering, metallurgical investigations, plant optimization, plant troubleshooting, needs. WE “FIX” METALLURGY.