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Friday, February 15, 2019

Anta Kori Update

I haven't been following Regulus to closely for the last 6 months, but I decided to compile the new drilling data (link and link) and see what they have been finding, and how the new drilling may impact the overall resources for the project.

Background blurb:

The original resource for Anta Kori was done waaaaay back in 2012 for South Legacy, but if you read through it, it is very light-weight, we don’t get any information on:

  • Where the resources are located – not even a simple map
    • Where are the open-pitable resource located?
    • And the underground resource? Where is it, how will they mine it, from the bottom of the pit?
  • No images or sections of the block model showing grade distribution etc.

It is a crap report, a quick and dirty resource calculation. I especially hated the way that they used every metal under the sun to calculate the CuEq grades for the various resource cut-offs.

In essence, it is a crap report.

However, table 14.7 did give a breakdown of the global resources (i.e. not constrained by property boundaries). I wanted to see if I could create a base model from the historic data that could match it, with the idea that I could bring in the recent drilling results and see what happens.

However, I have a big problem:

Look at this table in detail, start with the first row. Write out the total contain metals in full (i.e. including the “0” in the column headings. Do you get:

  • 519,541,000 tonnes or ~520Mt that contain
    • 4,429,000 lbs of copper – just 4.4Mlbs
    • 126,335,000 oz of gold – 126 million ounces of gold 
    • 3,989,155,000 oz of Silver – just under 4 billion ounces of silver
    • 10,598,000 lbs of Moly
    • 572,695,000 lbs of Lead
    • 2,172,276,000 lbs of Zinc

Damn it, Southern Legacy found South America’s largest gold deposit and second largest silver deposit. Who gives a shit about copper with all that lovely gold and silver.

Unfortunately, as I’m an idiot, I decided to try and work out WTF was going on, brought the data into excel and calculated the amount of contained metal for each element (basically took the tonnage and multiplied it by the grade provided).

And you get….

There are some slight differences:

  • ~30% reduction in contained copper (assuming the table was referring to Billions pounds of copper).
  • ~45% increase in gold (I have assumed that they put the contained gold under the contained silver column)
  • Silver, lead and zinc stay the same (assuming that the contained silver was put under the contained gold column)
  • ~80% drop in contained Moly

Generally, very painful news, but the extra couple of million ounces of gold is a nice bonus.

The silly thing is, table 14.5 that splits the resource into Open Pit and underground areas, i.e. the one on Regulus’ website is fine.

WARNING: These guesstimate calculations are complete BS. They are based on grade only, and are designed to give a feel to what Regulus have added to the project.

This is a global guesstimate, I haven't split out mineralization by type, I have assumed everything is the same, which we know is wrong as the high-grade intercepts are restricted to narrow, sub-vertical breccia bodies and veins.

I've included a Leapfrog 3D viewer file here of the various iterations (link)

I’ve used the CuEq values, but in the recent drilling these have been calculated from Cu+Au+Ag only, not everything including the kitchen sink as used in the 2012 technical report.
I haven’t factored in mining type, property ownership or recoveries. I’m treating it as a single deposit, calculating the global resources and then clipping it by property boundary to see how much is in Regulus’ concessions..

TAG Guesstimate Global Historic resources

So we get close, I have slightly less tonnes and a slightly smaller CuEq grade (0.48% vs 0.51% from the 2012 technical report).

When we compare the drilling we can see that Regulus have done a lot of work.

Before Regulus:


lots more copper intercepts

We see a lot more holes, drilled to much greater depths exploring for the Skarn mineralization that was of secondary interest to Southern Legacy who were mainly focusing on the near surface high-sulfidation gold dominant mineralization.

So, what impact does that have on the project ‘resources’?


Potentially a lot.

WARNING: I've assumed that all the mineralization is the same, I haven't separated by skarn vs HS vs breccia vs vein. It will be an over-estimate.

If we clip it by property boundary:

We see that the majority is on Regulus’ concessions. This is biased by the fact that they can’t report the intercepts that do not occur on their concessions. 
However, when we put the global resource figures on the USGS Porphyry Copper chart we see this:

*CuEq figure form the 2012 Technical report, but just using Cu, Au and Ag

If we look at the global resources, the average grade of Anta Kori wasn’t quite good enough. However, if we look at the high-grade (>0.5% CuEq) core of the system, we see that the project changes completely.

It now sits firmly in the ‘good’ area of the chart.

TL:DR version

Regulus have done a lot of work at Anta Kori that should lead to a decent jump up in resources. The key here is to look beyond the overall tonnage to see how much high-grade (>0.5% CuEq) material they have.

An important question to ask or at least think about is - How will Regulus report their upcoming resources? With the agreement with Coimolache allow them to report a global resource or will they only be able to report the mineralization that occurs on their concessions?
An Observation
On the plan map that accompanies the last PR we see hole AK30 sitting way out to the NW all on its own. Why did Regulus drill such an anti-social hole?

If we look a bit closer we see that the hole starts on Coimolache ground, suggesting that Regulus are still working with the Coimolache permits. This may mean that they still haven’t been granted their own permits to drill in that area.

It looks like the hole is testing the contact between the limestones and porphyry, but without a decent surface geology map to help, it is hard to know why they have been drilling ~500m to the NW of the known mineralization. It is a low risk hole, if it gets something, then they’ll have expanded the footprint significantly, but if it gets nothing, no-one will really care.

Thursday, February 14, 2019

Garibaldi BS

Happy Valentine's day, a time of friendship and goodwill.

So it is nice to see that it has been 106 days since Garibaldi last released any drill results from Nickel Mountain (link).

We were nicely told back in December (link) that they successfully completed the first full season of drilling, producing 11,573m of core.

So we are still waiting for results from 22 holes, or 2/3 of the program, which as GGI tell us:

Damn, you guys must be really slow if it takes you that long to interpret the results.....

Maybe we'll get something in time for the PDAC....

Friday, February 1, 2019

Sun Metals - Stardust in Central BC

There are very few 'new' discoveries being made, and most junior explorers are flogging dead dogs that have been around for such a long time that most you can ignore.

This was my initial opinion of Sun Metal's Stardust project, it had a tiny resource but has had a lot of work done on it, ~398 RC and diamond holes, or ~70Km of drilling.

Not much here

What a POS - a small, low-grade, well explored project in the middle of nowhere. The didn't seem to be much potential in the existing resources. They appeared to consist of a series of narrow, variable grade zones that have had the crap drilled out of them. 

lots of narrow zones

So where were Sun Metal's going to find more mineralization? Projects like Stardust are quite common for it to go any further, you want to see some potential that it could host resources around >10Mt @ >3% CuEq to get a mid-tier miner (e.g. Crapstone) involved.

I'm just focusing on the skarn mineralization. I know that the project has several other mineralization styles, but they aren't the focus on the technical report, which suggests that they aren't important economically. You can get the 3D model from here (link), there was only a small proportion of the historic data that I could get in.

For those getting massive erections from the Porphyry zone, it has been drilled and no results are mentioned in the technical report, so I assume that it is unmineralized, but the lack of mineralization in it could be:

  • Negative (the majority of intrusive rocks) the magma that formed the stock was relatively metal poor, and therefore any mineralization associated with it will be small and uneconomic.
  • Positive (e.g. Santa Eulalia, Mexico; Taylor, Arizona, Las Bambas, Peru to name a few) – the stock was emplaced into a reactive rock (the limestones) that 'sucked' out all of the metals to form large skarn/CRD bodies leaving the behind an unmineralized porphyry.
However, the recent drilling (link and link) did look interesting. I wanted to check that they were doing more than confirmation drilling, i.e. twinning good old holes to con people into believing that they had found something new.

Simply put, they did a bit of both. Tested the known zones (probably because the historic core is missing), and they tested a few geophysical targets.

The good news that came out in October was from a confirmation hole (i.e. one that was drilled into an area that had been drilled before), and we got this section.

We can clearly see that the majority of the skarns are hosted in narrow limestone units within the phyllite package, which explains the narrow, irregular nature of the resources, which is not a good situation if you want to find a big deposit!

However, drill-hole 18SD-421 was good, it drilled through the phyllites and passed into the underlying limestones where it intersected 2 previously unknown, thick, high-grade skarn/massive sulfide zones.

This is great news as it shows that Sun Metals has found something new, rather than rehashing old news, and it appears that this phyllite-limestone contact is virtually undrilled! This zone appears to be open in most directions, especially up-dip.

The down-dip potential could be limited by hole LD2010-02 that may have drilled the down-dip continuation of this zone but hit nothing, but the hole may have been terminated before hitting the mineralized horizon.

I don't know the ground conditions at Stardust, but maybe there is an opportunity to reenter and extend holes 013 and 016 to drill through the phyllite-limestone contact as this would allow them to quickly determine (in 2D) the orientation and up-dip extent of this new skarn zone.

In summary, Sun Metals have a well explored project, but the discovery by hole 421 has identified a new target that has returned the highest-grade and thickest skarn intercepts on the project. However, with just a single hole intersecting this zone it is very hard to determine its size potential. 

In addition, they may want to look at conducting a down-hole geophysical survey, for example Mise-à-la-masse that has been used successfully in many other polymetallic sulphide deposits to determine its lateral extents.

Wednesday, January 16, 2019

Serengeti - Buffing the Banana

Someone asked me to look at Serengeti's Kerwanka project in BC.

You have to give credit, Serengeti's team have been hard at pounding the the bald-headed moose, cranking the shank, and feeling their way around Kerwanka.

However, the problem with dancing with the one-eyed driller is that once in a while you have to consulting with your silent partner to see if the project is good enough for a one gun salute.

So why don't we stop serenading Mrs. Palmer and her five daughters by letting go of the one-stringed guitar and have a look:

what a load of crap
Wow, the open pit resources are terrible and the the underground "resources" are just a Cu(m) stain.

So basically, they could define >10 billion tonnes at a similar grade and it would still be too shit to put into production.

For amusement, here is the Kerwanka underground resource plotted against the mighty proposed block cave operations

Well, someone has to come last...

So basically, all that hard work milking the moose, fly fishing and hoisting the petard still means that the project is crap. That's enough to make the the bald man cry

Tuesday, January 15, 2019

Pretium - another Brucejack fail

Joseph Ovsenek must be feeling a bit of a twat at the moment, not only did he tell us back in September that (link):

[Pretium quote]

They failed to do this (link) by falling 5% short of their lower guidance expectations, and just to top off the good news, we get a nice PR investigating the trading it is shares (link).

So how bad were the Q4 numbers?

Pretty shitty, there has been a consistent decline (but like my school grades) since the mine reached steady state production and the new grade control system came into place.

It is almost as if Pretium, by some coincidence managed to be mining some high-grade zones the same time. How fortunate.....

We can clearly see that only once (Q2), did production come close to the Feasibility Study number, and Q4 was a huge miss.

My bug concern, and I've mentioned this a few times, is what will happen to the grade once they ramp up to 3,800 tonnes per day?

If they manage to maintain the same average head grades (11.98 g/t Au) and recoveries (97%) that they achieved in 2018 (around 11.98 g/t Au) after the expansion we should expect quarterly production to be around:

  • (90 x 3800 x 11.98 x 97%) /31.1 = ~128,000 oz per quarter
Ironically, this is approximately what they would have been mining if they had managed to match the grade in the Feasibility Study. 

However, the common thing that happens when a mind finds itself with a hungry hungry mill, it that they chuck any old crap into it and the grade plummets.

I wonder what will happen here?