The MacFadyen Group of five Paleozoic kimberlites is located along the course of the Attawapiskat River amongst 17 other kimberlites. Sixteen of those kimberlites were discovered in the area by Monopros, the Canadian exploration arm of De Beers Consolidated Mines in 1988-89. The seventeenth other kimberlite was drill identified by a joint venture between Canabrava and Navigator, near one of the more southerly De Beers kimberlites. The figure to the right shows the MacFadyen group and the DeBeers swarm.
Spider and KWG discovered their first two kimberlites; MacFadyen #1 and MacFadyen#2 in 1994. The two kimberlites underwent minimal testing during 1995. They were confirmed to be diamond bearing, however, they require further evaluation by Spider. Initial drill-testing of MacFadyen #1 kimberlite consisted of the discovery hole by Spider and two follow-up drill holes. The initial drill-hole 94-1 sampling consisted of 33.4 goof kimberlite, yielding 2 macros and 2 microdiamonds. The diamonds were described as resorbed irregular to twinned octahedral in morphology by Ashton Mining of Canada Inc. in 1994. The combined carat weight for the two macro diamonds was 0.065 carats for a sample grade of 1.94 ct./tonne.
Following a very detailed interpretation of ground and airborne magnetic data, acquired over several different periods, Spider and KWG returned to the MacFadyen group in the summer of 2003. Additional ground magnetic survey data was acquired and new targets were tested in the early spring of 2004. To date, three additional kimberlites have been discovered, bringing Spider and KWG's total to five. See the total magnetic field ground magnetic image to the left.
In addition to the five shallow kimberlite signatures visible in the magnetic field map, a linear anomaly is also evident. This is anomaly is indicative of a deep, pre-Paleozoic linear has been interpreted as a possible kimberlite dyke. Attempts to drill test the feature have failed and the source of the anomaly is unexplained.
The MacFadyen Group of five Paleozoic kimberlites is located along the course of the Attawapiskat River amongst 17 other kimberlites. Sixteen of those kimberlites were discovered in the area by Monopros, the Canadian exploration arm of De Beers Consolidated Mines in 1988-89. The seventeenth other kimberlite was drill identified by a joint venture between Canabrava and Navigator, near one of the more southerly De Beers kimberlites. The figure to the right shows the MacFadyen group and the DeBeers swarm.
Following a very detailed interpretation of ground and airborne magnetic data, acquired over several different periods, Spider and KWG returned to the MacFadyen group in the summer of 2003. Additional ground magnetic survey data was acquired and new targets were tested in the early spring of 2004. To date, three additional kimberlites have been discovered, bringing Spider and KWG's total to five. See the total magnetic field ground magnetic image to the left. 
