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Happy enough if NC do not feel the need to give actual cobalt figures, just as so long they include the value when it matters.
Hi Bamps, the mineralogical make up of the ore will be critical to the Met process. Metallurgists can employ lots of clever tricks when dealing with complex ores, which seemly will be necessary with the Havieron ore in order to maximise secondary mineral recoveries. (cobalt, possibly selenium etc) This will be the real gravy part of the operation. Optimum grind size for best liberation; possible re-grind of the concentrator tailings; what minerals are taken into solution during the leach process and so it goes on. Fascinating stuff for sure.
Hi LC, Yes - spent a good few years in copper mining and processing operations plus project engineering. Also been around a lot of gold mines in my time.
Hi Nedd
Low grade will be leached and this loses a lot of minerals into the tailings.
As I've mentioned the crushed gold ore goes into the cyanide circuit and residual sent for copper concentrate this is where the cobalt will be found and sent to the refinery.
High copper ore goes into the copper concentrate.
Low grade will be leached and other minerals lost to the tailings.
ATB:))
Bamps - you must be as old and decrepit as me. Make sure you come to the next Stag gang meet - when I can fix a date - and I will personally introduce you to Panama. You will then have a clearer understanding of the difference between Panama and Panorama.
But thanks for all the info. It is not only school kids who are learning online at home.
Spring is coming. And the pubs will soon be open, and normality will return. Patience.
Tig
Great post Bamps; always good to read a well structured informative post than the one line monotone drivel from the trolls.
Correction Bamps21, 4104ppms is 0.41% . If it was 4.1% Co , then GGP would have a cobalt mine on their hands with gold and copper as credits! That said, 0.41% Co is an healthy grade and a highly valuable by product.
It's likely that any cobalt will be recovered before the gold is sent to the refinery, during the concentration process. If it's CIL they use to recover gold, then there will be little of anything coming back from the refinery. Most of the other by-products present will end up in the residue at the bottom EW tanks. This usually requires a dedicated plant specialising in the treatment of EW residues to recover anything else of interest.
Hi Tig
I keep putting Panama too :))
Yes Panorama could be the largest cobalt field in WA or even Australia.
Cobalt doesn't come on its own either with Nickel or copper.
It's in the same geological zone as Carlow Castle of Artemis
ATB:))
And theres my typo. 4.1% would be 41000ppm.
Cheers Bamps.
Not sure if a typo, 4100ppm is 0.41%
Still relative to the 6000ppm in Congo it fairs well. 0.41 would be a whopping 41000ppm
Hi Oilmonkey
Cobalt will be a credit coming back from the refiners.
Cobalt is found in the copper concentrate, during electrolysis the copper in the copper anode migrates to the copper cathode, all the other minerals gold,silver, cobalt,arsenic , iron, lead etc fall to the bottom.
They are recovered and made into a cobalt anode and by electrolysis a cobalt cathode is made and rest of the minerals recovered again.
Before the copper concentrate process gold ore is sent through the cyanide circuit and gold dores are made about 70% gold and silver the rest mainly iron.
A bit more complicated than that but that's the general process.
In hole 006 cobalt peaked at 4104ppm that's 4.1% that's extremely high.
Holes 006-009 are the only ones where it is mentioned but looking at the logs it's right the way through them.
It can't have disappeared it's just not being reported by NCM who took over drilling from hole 009.
Highest cobalt ppm has been recorded in the Congo at over 6000 no where else is anywhere near so 4104 is extremely good.
in that same hole 006 copper peaked at 12.4% that again is extremely high
ATB:))
@@@ my good friend Bamps. You suggest some cautious modest Cobalt results from Havieron, and if they can extract and isolate it - so much the better ,and all grist to the mill.
But Bamps, am I correct in reccollecting that the Panorama ( I nearly said Panama - oooops!! ) is a huge ( potential ?? ) Cobalt prospect,- as yet untested. Could be a better prospect than Hav.
Or am I dreaming ??
Tig
The same thing happened with the silver etc, "Other metals are present in the system including silver to 211g/t, lead to 12% and zinc to 5.9%". Possibly not in sufficient tonnage to make recovery viable.
Sojourner. Definitely no mention of it in the MRE.
I am pretty sure that the cobalt was not included in subsequent calculations, but perhaps Bamps could clarify this.
Bamps,
Do you know if Telfer is set up to extract Cobalt in addition to Cu and Au?
If not is it a major modifiation to the process? Obviously only if economocally viable, but as shown above GGP has previously stated its worth noting in their Au equivalent calculation.
I like that Bamps. The beast that just keeps giving :)
The first mention I can find of cobalt at Havieron is on the results for Had006,007,008,009
These were drilled vertically except 007 which was 70degrees to between 750-900m depth.
"Analytical results for HAD006 through HAD009 have now been received and are reported in this announcement.
Overall, every hole intersected mineralisation with broad intercepts reported in several holes. HAD006, HAD007 and HAD009 all ended in mineralisation highlighting the depth potential of the system. HAD006 intersected more than 367.1m of mineralisation at 2.0g/t gold equivalent, including 150.5m at 3.5g/t gold equivalent. HAD008 returned 89m at 3.6g/t gold equivalent. In HAD007 gold peaked at 21.75g/t and indicated additional mineralisation several hundred metres further east. HAD009 tested the deeper parts of the system returning significant copper intercepts from approximately 765m downhole to end of hole.
Cobalt grades have been consistently elevated throughout the mineralised system and it has been deemed prudent to add cobalt (along with copper) to the gold equivalent calculations. "
These calculations added 1g/t in places but generally 0.2g/t to the gold equivalent value.
"HAD006 was collared 50m south of HAD001 and drilled vertical to track mineralisation as seen in HAD001 and HAD005. HAD006 intersected desert sands and calcrete to 3m then Permian sediments to 424m before entering the Proterozoic target sequence. From 424m to 475m a barren mafic intrusive was intersected. From 475m the hole intersected mineralised brecciated calcareous sandstones to end of hole at 838m. Results included broad intercept of 367.1m at 1.15g/t gold, 0.44% copper and 176ppm cobalt from 471m to 838.1m (eoh), including 150.5m at 2.25g/t gold, 0.67% copper and 224ppm cobalt from 471.5m. Peak gold in HAD006 was 101g/t, peak copper 12.4% and peak cobalt 4,104ppm. Further intercepts are presented in Table 2.
HAD007 was sited 250m east of HAD001, angled at 70 degrees toward grid west, and designed to collect structural information on the host rock sequence. HAD007 intersected desert sands and calcrete to 4m then Permian sediments to 467m before entering the Proterozoic target sequence. From 467m to 550m variably silica altered calcareous sandstones were apparent; concentration of visible mineralisation increasing with depth. A barren mafic intrusive was present from 550m to 601m and then from 601m to 754.5m (eoh) silica altered calcareous sandstones were intersected with visible laminated mineralisation interspersed.
The cobalt is there at Havieron but NCM don't seem to publish anything other than gold and copper part from molybdenum at Cadia.
0.2g/t doesn't sound a lot but with the tonnage at Havieron @1,000m depth would give an additional 3.1m oz gold equivalent.
There's only 1 Havieron:))