2 Diamond Projects Host Multiple Diamondiferous Kimberlites

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Discovering New Diamondiferous Kimberlites Using Non-Magnetic Geophysics

5 Kimberlites Found Via 2021 Exploration

  • Arctic Star looking for diamonds at its Diagras Property, NWT and at Timantti, Finland
  • World Class Exploration Team Lead By Buddy Doyle
    • Leader of the exploration team that discovered the Diavik Diamond Mine in Canada.
    • Diavik has produced over 100 million carats since 2003
  • The Diagras Property contains 20 known kimberlites
  • Originally discovered by DeBeers with Mag surveys in the 1990's.
    • Arctic Star is targeting non-magnetics using new and improved gravity technology.
  • Detailed, modern ground geophysical techniques are being employed to define possible additional kimberlite(s) or kimberlite phases not identified by previous explorers, who did not utilize all these techniques.
  • Diavik has produced over 100 million carats of diamonds since 2003 in the Lac Des Gras Diamond field.
    • It’s currently operated by Rio Tinto and is 25km away
  • The geophysical work done over three exploration seasons has created multiple drill targets, currently being drilled.
    • 2 kimberlites to date & a possible "Kimberlite Complex" discovered

Situated In a Corridor of Economic Diamond Deposits

  • Green Diamonds are kimberlites.
  • Blue Diamonds are Kimberlites with mine plans that have Greater than 1ct/t.

EXPLORATION TARGETS DELINEATED FOR 2020 DRILLING

Black Spruce:

Figure Above:. Ohm Mapper results for the Black Spruce Kimberlite. Colour image, EM data Magenta is less resistive. Contours Gravity data.  Dotted blue outlines gravity targets, black outline magnetic signature. Note that they overlap but don’t coincide which may indicate separate kimberlite phases. Dots are previous drill holes targeting the magnetic anomaly. The black dots Majescor holes.

  • De Beers discovered kimberlite by drilling a distinct magnetic low in the early 1990’s.
  • In the early 2000’s the property was optioned to Majescor, which drilled the edge of the magnetic kimberlite testing part the EM anomaly.
  • Work in 2017 shows a series of gravity lows occur coincident and adjacent to the south of the known magnetic kimberlite phase.
  • One of these gravity anomalies clearly breaks and disturbs a diabase dyke signature, which is a characteristic similar to many known Lac de Gras kimberlites.
  • Results from 2019 show a strong EM anomaly that is partly separate and partly coincident with the magnetic and gravity anomalies.
  • The simplest explanation is that each geophysical signature, the Magnetic, the gravity and the EM represent different phases of the same kimberlite complex. Each phase can have totally different diamond grades and populations.
  • The gravity and EM anomalies require separate drill testing. Three separate targets exist.

Jack Pine Kimberlite

  • The Jack Pine kimberlite is one of the largest kimberlite complexes in the Lac de Gras diamond field (over 1.5km in its longest dimension)
  • The geophysical methods (ground gravity, EM and magnetics) highlighted obvious magnetic kimberlite phases drilled by previous explorers
    • Also successfully definied a new kimberlite-like geophysical expression believed to have not yet been evaluated by drilling according to available public domain records.
    • Previous drilling in the Jack Pine kimberlite complex has demonstrated it is significantly diamond bearing.

Suzanne Kimberlite

  • Ground geophysical work has revealed a magnetic low anomaly, a gravity anomaly and a linear EM anomaly interpreted to be over 600 meters in length.
  • Data in the public domain indicates that only one drill hole tested this kimberlite leaving potentially untested kimberlite(s) and/or phases.

 HL-02 Kimberlite:


Figure Above. Top left Ohm Mapper results for the HL-02 Kimberlite. Colour image, EM data Magenta is less resistive. Contours Magnetic data. Dotted outlines depict drill target, Top Right Gravity Image, with Magnetic Contours, and bottom Left Magnetic image with EM Contours.

  • At the HL02 Kimberlite DeBeers drilled 2 long inclined holes one intersecting only a few meters of hypabyssal type kimberlite at the end of the hole. 
  • It appears from this work that there is an untested gravity and EM target that breaks a diabase dyke.
  • This is a classic compelling kimberlite drill target. 

 

TIMANTTI FINLAND – A NEW KIMBERLITE FIELD

Arctic completed a 600 km2 UAV magnetic survey this Summer, adding to our Winter ground Mag

Greenstones belts and gabbro sills dominate the image as long linear Mag highs

Some of the new targets highlighted, arrows, kimberlite targets Kimberlite targets in the quite quartzites tend to stand out

Wolfpack Targets - Timantti Finland

  • 38 New untested drill targets for 2020.
  • Red arrows point to the top priority targets.
  • As little as 1-3 m overburden.
  • The Wolves seem to form an East-West trend (Yellow Arrows).

 

 

 

Last changed at 31-May-2021 10:19AM by AGORACOM