"This is from CDU the drilling update 25/1/07
Native Copper Assaying (Explanatory Notes)
Intersections from drill holes containing large amounts of copper metal are assayed
at metallurgical laboratories by screening out all particles of native copper above
3mm which, in some cases, is more than 50% of the entire sample. This method is
used due to the variable distribution of native copper and these coarse particles
being non representative.
With respect to Las Minerale the native copper appears to be evenly distributed
throughout the supergene zone.
In the future, native copper samples from all diamond holes containing native copper
will be assayed by analysing the whole sample and not screening out the +3mm
fraction size.
The samples will also be used in the metallurgical and ore processing studies for
plant design.
Drill Hole DORC 87 drilled last year, was assayed by acid digest using the -3mm
particle size native copper. The hole intersected 41m @ 4.95% Cu from 44-85m
including 26m @ 6.59% Cu from 48-74m."
The above valuable information was reminded by Wearthefoxhat on other thread "Nev Mmerd and others".
If this is the truth, then all the reported company's drill core data after 25/01/2007 may be assayed by analysing the whole sample and not screening out the +3mm fraction size. I am still not quite clear.
And this time the JORC report definately cut all the native copper back by screening out the +2mm native copper fraction size! My opinion is YES.
From surface to deepth 150m in Rocklands, I am afraid that native copper represents more than half of the toal resources, but how many are reported in the current JORC report?
If this is the truth, I wish the company could make a clear announcement on the issue of JORC native copper nuggets resource.
Weihua
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- native copper page 9 of jorc report
native copper page 9 of jorc report, page-21
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