Hello Dave
I had not forgotten your Munn Lake kimberlite question and have been trying to find a published source of the information and preferably one that was available electronically. Unfortunately, the following is all I could find within the above parameters. The magnesium and calcium data I picked up from conversations with company officials but as it is does not appear to be published, I am afraid I can not offer verification.
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“The Yuryi kimberlite float material is within a 150 metre diameter area with some of the larger pieces of kimberlite being in the 10 to 20 metre diameter range. There is also a strong development of kimberlite mud along the Munn Lake shoreline.
Microdiamond testing of the Yuryi kimberlite float material has returned 226 diamonds from 581.29 kg of treated kimberlite. Sixty-two diamonds are greater than 0.5mm in their largest dimension, with one 0.12, one 0.03 and three 0.01 carat diamonds being recovered. Overall, the majority of the diamonds are clear and colourless.
Kimberlite indicator microprobe chemistry results from the Yuryi kimberlite indicate that 41% of the 50 pyrope garnets probed lie within the G10 field and 6 of the 49 chromites probed have diamond inclusion chemistries.
The program to date has located 12 kimberlite dykes that occur in the vicinity of the Yuryi kimberlite float area, however, a comparison of the chromite microprobe chemistry between the chromites hosted by the kimberlite dikes and the chromites hosted within the Yuryi float material suggest that they are not related. The chromites from the kimberlite dykes have a 2% to 3% higher TiO2 value than the chromites that occur within the Yuryi kimberlite.
During November and December 1997 a 175 line kilometre picketed grid was established covering the up-ice area of the Yuryi kimberlite float location. This was followed by a completion of a magnetometer survey, horizontal loop and time domain (EM-47) electromagnetic surveys, a bathymetry survey (lake bottom depth) and the collection of 180 lake bottom sediment geochemical samples at 100m centres.
The above surveys have delineated approximately 16 targets that could be the result of kimberlite pipe intrusions. Most of the targets are within 300 metres of the shoreline. A total of five deep depressions have been defined with corresponding anomalous lake bottom sediment geochemical results that are high in chromium, titanium, niobium, nickel, magnesium, uranium and rubidium which are suggestive of a kimberlite source.
A number of high priority ground electromagnetic targets occur up ice of the Yuryi kimberlite float area with one particularly strong coincident time domain EM-47 and horizontal loop electromagnetic conductivity anomaly that is approximately 400 metres by 150 metres in dimension. Diamond drilling to test the 16 various anomalies will commence during the first week of April. A total of 2,000 metres of drilling is expected to be completed by the end of May.
Approximately 1,200 of the 1,700 till samples collected during 1997 have been processed for the recovery of kimberlite indicator mineral grains. The till sampling program was designed to further define six kimberlite indicator trains that occur within the property. The indicator mineral trains have pyrope microprobe chemistries that range between 20-40% G-10s.”
Looking forward to your GMD NR on last year's geochemical sampling results and confirmation of both multiple lake targets and an immanent drilling schedule.
Regards
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