G'day Froggy-Do some more research on different types of...

G'day Froggy-Do some more research on different types of samples, don't put the results of your research on H.C
as just clogs the threads- its what you wish to know not us as to a large extent are already aware.

See-below to help you understand thing a bit better-hope it helps

The best sample results to watch are bulk samples results eg 1,000kg one tonne bulk sample taken in situ,
& then even better if the sampling process is the same way it will be processed when mined & processed,
this is a very good representation of what you can expect to recover from that area the sample was taken from.

Panel samples-though good are not as good a representation of what you can expect to recover post processing,
because -a panel sample 20kg x 2 mts is a thin elongated slice along ( generally the vein ) so when the vein is extracted
through blasting it will dislodge material that in all probability has very low grade to zilch along side the targeted mineralisation-the position the sample was take-hence when material is bogged out the low grade material dilutes
the high grade material.
This is known as the dilutionary effect during the extraction of mineralised material.
How much dilution you can expect varies considerably & on many factors-leave that for another time.

Extract -ASX Release below
Methodology
Underground samples are collected either as panels or channels.
Panel samples are 2 meters long (to ensure representability in a coarse-grained gold environment),
continuously taken along the vein throughout the mine, up to around 20 kg in weight.
The panel vertices are then surveyed by a qualified surveyor using an electronic Leica total station to
guarantee the precision in the sample location.


The panel samples give other indications -eg veining is continuous-if you care to go back & reread ASX reports
OGX made it clear that the panel samples where 2mts in length & 20 kg's from memory- taken along the high
grade veins -this is great as results indicated that high grade veining was in most all cases continuous,
a vein that stops & then starts or worse ends is very hard to extract any volume from.
Ideally the vein widens -as if when it does you can extract more volume per mt, listen to the M.D.
talking during the presentation he states that high grade veining widens considerably at depth,
this is very good news indeed-listen again for those that did not pick up on the significants of that statement.

One of the issues with the previous debacle was dilution during extraction -to much waste material was
extracted with the targeted high grade- understand the waste material also gets processed .
eg-100 g p/t panel sample -when blasted & removed had dilution effect from low to little or none in material
alongside the targeted for extraction material.
EG-material of 400 % 4 x parts waste 1 x part at 100g p/t so your average grade immediately drops down to
20 g p/t as all this material is to be processed - & no matter what is said 85% is a very good recovery from a
gravity plant on average- working well so you hade 100 gram panel sample & it ends up being potentially 17 g p/t
recovered 3 g p/t to tailings .
Understand this just an example lot & of variables come into play, OGX has improved its mineralisation
extraction methods sometimes using pneumatic hydraulic hammers - if what they are trying to extract justifies
re position access & vein width etc -they have also improved their blasting methods so as to fracture rather
than explode mineralisation all over the show-this will help considerably though dilution will still occur.

​

　
ASX/Media Release – 30 January 2018
Current MGT-Quote-During the month of December new drilling and blasting techniques were implemented thus
reducing the volume of explosives used per blast and giving superior rock fragmentation.
Following the successful conclusion of small-scale stoping trials in both Mestre and Central zones during
Q3 drilling and blasting parameters were optimized in Q4 for the different rock types encountered.
These changes successfully reduced explosive costs, improved rock fragmentation, and further reduced
dilution.

​

ASX/Media Release – 19 February 2018
With new drilling and blasting methods successfully implemented in the stopes, we have been able to reduce the explosives consumption by 51% and are able to control the ore dilution .
Our mine planning department is currently redesigning the mine which will be driven on ore and with minimal waste development.
This design will give us larger stopes to extract ore from and minimize the number of development drives.





New stope blasting method 30cm ore vein removed with minimal explosives
Absolute -pression -salt


So Frogman please stop receptively posting panel sample grades on every thread-it would be appreciated,
You can now advance you understanding with further research -no need to post what you find as its your quest.
Hope you now have some rudimentary understanding.

salt