NR Credit Lake
posted on
Mar 05, 2010 02:43PM
Discovering New Diamondiferous Kimberlites Using Non-Magnetic Geophysics
March 3, 2010 TSX.V: ADD All 2009 Till Results for Credit Lake Received ‐ Compelling Geochemical Responses Cause Geophysical
Targets to be Upgraded to Very High Priority Drill Targets for April, 2010 Program Arctic Star Diamond Corp. (“Arctic” or the “Company”) is pleased to report that it received all of the 2009 till geochemical results at Credit Lake. This program was designed to, and succeeded in, discovering new targets that may be due to blind (buried) mineralization along the strike of the Providence Greenstone Belt. This belt contains the magmatic, komatiite cobalt and platinum group element
(Ni PGE) sulphide discovery made by Arctic in 2008 which was also selected on the basis of an EM
(Electro soil geochemical anomaly. Arctic’s best
drill hole in the discovery area reported 5.1m @ 1.73%Ni, 1.75% Cu, 0.17% Co and >2g/t platinum equivalent (Pt+Pd+Rh+Ir+Os). The final compilation of these geochemical data clearly indicates, enhances and defines eight high priority nickel+copper+cobalt targets in the Central and Western Zones in addition to the eleven targets identified in the Eastern Zone, which were discussed in our new release of February 8, 2010. Most of the eight priority zones coincide well with geophysical targets that were developed from the 2008 VTEM airborne survey. Numerous of these soil anomalies possess signatures of magnitudes equal to or greater than that signature developed from detailed soil sampling over the discovery area. Figure 1 (below) illustrates the soil targets by overlaying three datasets. The grey scale image in the background is a gradient map of the total magnetic field. The arcing east west
trending bands map the ultramafic rock types that host the nickel mineralization at the 2008 discovery site. The north northwest striking features are young diabase dykes that intruded the Providence Belt
much later than the mineralizing events. The VTEM response (channel 23) is shown in color: The "hotter" the color, the “stronger” the electromagnetic response. Anywhere that the VTEM response and the magnetic response coincide, is considered an excellent drill target. There are 45 separate areas and zones where this occurs. The nickel, plus copper, plus cobalt geochemical response from the till sampling for which the results are being reported here are superimposed on the image as 50ppm contours. The more anomalous areas are represented by dense compact lines on the image. Red arrows have been placed where there is a strong correlation between the geochem and a nickel EM signature; the yellow arrows represent areas where ground EM investigation is warranted. Buddy Doyle VP Exploration for Arctic said, “These new results continue to reinforce the notion that both this type of sampling method is effective in the Arctic and that the Providence Belt has potential for additional new discoveries. The proof will be in the drilling and I am pleased to say that we are beginning mobilization for the spring, 2010 program by ordering the fuel needed to be hauled up the winter road. We expect drilling to begin on or about April 1st.” Table 1 summarizes some of the characteristics of the VTEM targets where they coincide with till geochem anomalies in the Central and Western Zones. EM Target Name Geochem VTEM Ground EM & Mag Comments TZ 21 On south side of
strongest geochemsoils anomaly Good airborne response on north flank of ultramafic trend in Central Zone Confirms the presence of EM and mag target at TZ 21.
TZ 21 and the
coincident soil anomaly is well placed on north flank of ultramafic trend and at major structural intersection with NNW diabase dikes A15 A subtle geochem response in an area of thick glacial cover (boulder pavement = poor sample conditions) This response suggests the anomaly would be more intense if good sample medium were present No explanation at surface, thick cover. Moderate EM response To be completed prior to drilling Needs ground surveying before drilling TZ 5 Weaker soils response
but poor sample conditions. Talus slope at foot of steep cliff Moderate weak
airborne response isolated on north side of formational conductor Needs ground surveying before drill testing No surface explanation of conductor, sand & large boulders in talus slope A 20 & 21 Multiple moderateweakly
anomalous Ni,Cu,Co soil responses coincident with geophysics Moderate magnetic and EM responses Good EM and mag responses Within and on north flank of ultramafic trend The Qualified person for this news release as per the guidelines of NI 43 101 is Buddy Doyle.