QUEBEC – STORNOWAY DIAMOND CORP. of Vancouver and its partner SOQUEM of Quebec City report finding a 10.15-ct light off-colour gem-quality octahedral diamond during work at the Renard 3 project in the Otish Mountains. A picture of this beautiful stone and others is posted at www.StornowayDiamonds.com/news/2007/gallery/).
Renard 3 has now returned a total of 2,681 carats of diamonds from 12 separate sub-samples with a combined dry sample weight of 1,929 tonnes, representing an overall diamond recovery of 139 carats per hundred tonnes (cpht) for stones retained on a +1 Diamond Trading Company (DTC) screen. Diamond recovery from individual sub-samples varied between 78 cpht and 223 cpht. To date, some 5,400 tonnes of kimberlite has been processed at the 10-t/h DMS plant located at the Renard site.
Stornoway says the 12 recent samples from Renard 3 were collected by underground decline 55 metres below surface at the 455-m level. Underground mapping has outlined six geological units, comprised of four fragmental kimberlite breccias (typical tuffisitic kimberlite breccia to tuffisitic transitional kimberlite breccia), a hypabyssal kimberlite breccia, and a hypabyssal kimberlite with coarse olivine. Variations in diamond content are apparent between these geological units, with the slightly elevated diamond contents corresponding to the hypabyssal kimberlite with coarse olivine (223 cpht in sample 3107) and the hypabyssal kimberlite breccia (191 cpht in sample 3109). Diamond content of the fragmental breccias varies from 78 cpht to 181 cpht, with a weighted average of 125 cpht.