Monday, December 18, 2017

Regulus - Antakori update

Just a quick update, a couple of weeks ago some additional assays were released by Regulus from Antakori (link).


  • Drilling restricted to the edge of the property
    • Focus on HS-epithermal system by Coimolache - drilling to extend pit resources
    • It is going to be interesting to see some drilling in 2018 designed by Regulus
  • Arsenic restricted to the Intermediate Volcanics and the HS-epithermal mineralization.
    • Minimal As in Skarn zone.
  • Thick, but relatively low-grade Cu mineralization hit by hole 17-161 extends the limits of the Skarn mineralization by 400m to the SE, but the elevated Zn and decreasing Cu indicates that it was drilled near the edge of the system.
I've brought in the new data into 3D and run it through Corebox's Drill Hole Interval calculator, and built a 3D model, that you can download it from here (link - note: it is 63MB in size). I want to see how the Cu, As and As are related.

DISCLOSURE: I have used the assay information from Table 2 as it includes assays for Ag, Zn and As. Its intervals are slightly different to Table 1, from where the press release headline was is referencing, so there will be slight differences.


We can see that all the 2017 drill-holes have come from around the SW margin of Regulus' concessions. When we overlay this information onto a satellite image we can clearly see that the drilling by Coimolache is focused on drilling the extensions of the High-Sulfidation (HS) epithermal mineralization that they are currently mining.

Black = 2017 Drill-holes
Results are focused along the SW margin of the Antakori concessions, it looks like Coimolache are focusing on drilling the extensions of mineralization currently being mined.

Here are a series of sections from the latest results.

Section - L1050NW - Drill-hole AK-17-003 and 003A


We can see that the highest copper grades (>0.25%) appear to be found at the contact between the HS-epithermal (in the Light-green Upper Volcanics) and the skarn mineralization (in the Light Blue limestones), and are the discrete >0.25% Cu zones restricted to the narrow, intrusive dykes (pink and red units)?


It appears that all the gold mineralization is found in the upper HS-epithermal zone. Minimal gold appears to be found in the intrusive rocks).


Here we see As is restricted to the upper HS-epithermal zone with minimal As in the Skarn.

Section - L200NW - Drill-hole DHSF17-161 and AK_17_004 (results pending)


Again, Cu is restricted to the Skarn (limestones). It is generally low grade, around 0.1 to 0.25% Cu, but there are a couple of narrow, high-grade (>1%) zones that appear to be associated with either the old breccias or narrow Young Felsic units. In the NE, several short holes have intersected narrow Cu-Au mineralization associated with narrow, massive sulfide veins.


Minimal gold was intersected by hole 17-161, this hole didn't intersect HS-style mineralization within the AK concessions. It will be interesting to see how much HS-mineralization will be hit by hole  AK_17_004.


Again, minimal As is found within the skarn units.

So you can see that the Cu grades are gradually decreasing to the SE, and the elevated zinc assays seems to indicate that hole 17_161 was drilled into the peripheral part of the large Antakori skarn system, suggesting that the high-grade core is probably located to the NW.


  1. That would be REG.v

    News broke today of First Quantum Minerals Ltd. - FM.t paying zillions for an option on Northern Dynasty Minerals Ltd.- NDM.t pebble project in Alaska.

    Unknown what could possibly motivate anybody to jump into bed with the HDI group. That track record is truly horrific vis-a-vis the environment and public relations. And the Pebble Project? Damn Tis. That VERY controversial project is expected to cost billions and I'm guessing will never fly in this generation.

  2. Ace Ventura,could you stop posting unrrelated things and links to your blog given that the links are really poor quality?

  3. In the theme of Peru, I've taken a 20 minute gander at the massive political graft kerfuffle underway. For those semi-interested in the issue here is the reader's digest version ...

    Those fully uninterested and/or dopey critics (_*_) may decide to NOT follow the link. (Amazing how that works eh?)

  4. Do you have an email that I could send you a suggestion of a project to look at?