Geology & GeoMetallurgy

Geology & GeoMetallurgy 2017-04-04T06:58:01+00:00
  • To participate in the 911Metallurgist Forums, be sure to JOINLOGIN
  • Use Add New Topic to ask a New Question/Discussion about Geology and Geometallurgy.
  • 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.

Sampling a porphyry Cu-Au deposit (2 replies)

Oberstorm
1 year ago
Oberstorm 1 year ago

What is the maximum and minimum sampling interval suitable for cores in a porphyry Cu-Au deposit?

Dizzy Flores
1 year ago
Dizzy Flores 1 year ago

The short answer is 'it depends'. If there is a history of a certain sample length to define the geology and there is a lot of data then you may be stuck with that. For example a lot of old drilling one deposit I've worked on had 5 foot samples so there was not much choice other than sticking with 2.5 sampling intervals for new drilling. If a new deposit then you need to consider the likely future mining method and selectivity. If large open pit - perhaps two to three metres would be reasonable depending on geological complexity. A good place to look is stock exchange announcements to see what other are doing.

"All QDM drill core is sampled in continuous two metre intervals".

John Koenig
1 year ago
John Koenig 1 year ago

That is a good question. Porphyry Cu deposits are of very substantial size, and thus are typically mined using large-scale bulk tonnage methods. Consequently, ore blocks are usually estimated that are on the order of 5-10 meters in dimension. This means that samples collected from drill core through such deposits produce the best results if they are 1 to 2 m long (I have also seen lots that are 1.5 m long, but I think that is a consequence of geologists who are still working in the English measurement system; 1.5 m is close to 5 feet). I would probably consider 1 m to be the minimum sampling interval for use in a porphyry deposit, and probably 3 m as the maximum (although 1.5 or 2 m is probably the norm and best for most cases). Obviously, if a major lithological boundary occurs within the core, the adjacent samples should be terminated at the contact (and this typically lengthens and shortens the adjacent samples by a little bit). Geostatisticians can easily deal with the statistical issues associated with different sample sizes, so you need not worry about that.

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.