newsDianor Resources Inc.: Diamonds Discovered in Spessartite Lamprophyre on Killala Property
VAL-D'OR, CANADA--(Marketwire - Feb. 13, 2008) - THIS NEWS RELEASE IS NOT FOR DISTRIBUTION TO UNITED STATES NEWSWIRE SERVICES OR FOR DISSEMINATION IN THE UNITED STATES.
Dianor Resources Inc. (TSX VENTURE:DOR) is pleased to inform its shareholders that it has received results for the past season's exploration of the Killala diamond property in the Marathon area, Ontario.
During late 2006 early 2007 ground magnetic surveys were conducted on a number of airborne geophysical targets that had been selected from data derived from the Ontario Governments exploration initiative "Operation Treasure Hunt". The airborne data was reviewed and 63 targets were identified, based on magnetic and EM signatures. Of these 33 were selected for detailed ground magnetic surveys and 13 for MMI geochemical sampling. The results allowed targets to be prioritized in preparation for drill testing.
A dyke, discovered by Rudy Wahl, on the Killala property was sampled and found to be diamondiferous. A larger sample (1,205.80 kilograms) was collected from exposures of the dyke and sent to Kennecott Canada Exploration's Mineral Processing Laboratory in Thunder Bay, Ontario. The sample was processed to recover diamonds utilizing Kennecott's "mini-DMS" equipment which had a screen size of 0.5mm. The results of this work recovered a total of 66 diamonds weighing a total of 0.23 carats. The largest stone weighed 0.042 carats.
Summary of diamonds recovered through DMS processing of the Wahl dyke
--------------------------------------------------------------------------
Botton sieve aperture in millimetres Total Total
DMS ------------------------------------------- Diamonds weight
Fraction 0.150 0.212 0.300 0.425 0.600 0.850 1.180 (carats)
--------------------------------------------------------------------------
--------------------------------------------------------------------------
Non-magnetic
DMS sinks 0 1 1 32 8 0 0 42 0.09295
--------------------------------------------------------------------------
Non-magnetic
scalp 1 1 0 3 5 7 1 18 0.1336
--------------------------------------------------------------------------
Recrush 0 1 0 5 0 0 0 6 0.0063
--------------------------------------------------------------------------
Total 1 3 1 40 13 7 1 66 0.23285
--------------------------------------------------------------------------
The discovery of diamonds in lamprophyre dykes is new for the Marathon area. Petrographic studies of the dyke, by A.R. Miller, PhD, indicate that it is a spessartite lamprophyre. Attrition milling of samples of the dyke by CF Mineral Research Ltd recovered a suite of diamond indicator minerals including chromite, clinopyroxene and olivine. Chemistry of the indicator minerals provides further confirmation that the lamprophyre dyke encountered diamondiferous mantle material during its emplacement. In addition, the geophysical signature of the dyke - magnetic low - is found on other part of the claims and a drill hole in 2007 that tested one of the lows successfully intersected similar dyke material. A number of other magnetic low dyke-like targets, some in excess of 6 kilometres in length, remain to be tested on the claims. Some of the magnetic low features coalesce into larger ovoid bodies (1.3 by 0.7 km) that may reflect larger intrusives or diatremes. These targets will be tested during the 2008 exploration season.
The program of diamond drilling, initiated in August 2007, completed 4 NQ holes on 4 separate targets. The drilling, totalling 386.5 metres, intersected a series of diabase dykes as well as some unusual lamprophyre dykes. The dykes are believed to explain the magnetic anomalies that were drilled. A number of lamprophyre dykes, intersected in hole Dorkil-4, are identical to the diamondiferous lamprophyre and are associated with northerly striking magnetic lows 6 kilometres east of the diamondiferous lamprophyre. Dianor intends to conduct further sampling of these dykes as well as to test other magnetic anomalies having similar characteristics in order to fully assess the diamond potential of the Killala property.
Additionally, one drill hole (Dorkil-2) intersected a quartz-carbonate-arsenopyrite-pyrite vein. Analysis of the vein indicated gold contents of 969 ppb and arsenic of 31,200 ppm over the 0.5 metre intercept. Further testing of this vein is warranted.
Carl Verley, P. Geo., is the qualified person responsible for the technical content of this press release.