Karelian Diamond Resources Plc - Electron Microprobe Analysis of Kimberlitic Garnets
("Karelian Diamonds" or "the Company")
RESULTS OF ELECTRON MICROPROBE ANALYSIS OF KIMBERLITIC GARNETS
-- Electron Microprobe Analysis of Kimberlitic Garnets fromTill Samples
-- Results indicate very close proximity to source of the Green Diamond previously discovered by the Company
Discovery of the source of the green diamond could be particularly significant as coloured diamonds, including green diamonds, sell for prices which can be multiples of those for clear colourless diamonds.
Sixty garnets from a series of locations were submitted to
The Microprobe analysis resulted in the identification of nineteen G10 (harzburgitic), nineteen G9 (lherzolitic), fifteen G5 (pyroxenitic) and seven G4 (eclogitic) garnets. The presence of diamond stability field garnets (G10D) and other diamond-facies garnets (G4D and G5D) is a clear indicator of the diamond potential of the Kuhmo target area. (See Table 1).
_________________________________________________________________________________________ | |Eclogitic |Peridotitic |Pyroxenitic|TOTAL |Diamond facies | |_________|___________|________________________|___________|________|_____________________| | |G4 | | | | |G10D |G4D |G5D | | | | | | |Analysed|(inside | | | |Sample |Low-Ca |G10 |G9 |G5 |garnets |the |(Na2O|(Na2O| |number |Eclogitic/ |Harzburgitic|Lherzolitic|Pyroxenitic|total |Diamond |≥ |≥ | | |Pyroxenitic| | | | |Stability|0,07 |0,07 | | | | | | | |Field) |wt-%)|wt-%)| |_________|___________|____________|___________|___________|________|_________|_____|_____| |A5-23-01 |1 |9 |3 |4 |17 |2 |1 | | |_________|___________|____________|___________|___________|________|_________|_____|_____| |A5-23-02 | | |2 |1 |3 | | | | |_________|___________|____________|___________|___________|________|_________|_____|_____| |A5-23-03 |3 |7 |6 |7 |23 |1 | |5 | |_________|___________|____________|___________|___________|________|_________|_____|_____| |A5-23-07 | |1 |1 | |2 | | | | |_________|___________|____________|___________|___________|________|_________|_____|_____| |A5-23-09 |1 |1 |2 |1 |5 | |1 |1 | |_________|___________|____________|___________|___________|________|_________|_____|_____| |A5-23-09B| |1 | | |1 | | | | |_________|___________|____________|___________|___________|________|_________|_____|_____| |A5-23-17 | | |1 | |1 | | | | |_________|___________|____________|___________|___________|________|_________|_____|_____| |A5-23-19 | | |1 | |1 | | | | |_________|___________|____________|___________|___________|________|_________|_____|_____| |A5-23-21 |1 | | | |1 | | | | |_________|___________|____________|___________|___________|________|_________|_____|_____| |A5-23-23 |1 | |1 | |2 | |1 | | |_________|___________|____________|___________|___________|________|_________|_____|_____| |A5-23-25 | | |1 |1 |2 | | | | |_________|___________|____________|___________|___________|________|_________|_____|_____| |A5-23-29 | | |1 | |1 | | | | |_________|___________|____________|___________|___________|________|_________|_____|_____| |A5-23-32 | | | |1 |1 | | | | |_________|___________|____________|___________|___________|________|_________|_____|_____| |Total |7 |19 |19 |15 |60 |3 |3 |6 | |_________|___________|____________|___________|___________|________|_________|_____|_____|
Table 1: Classification of results of electron microprobe analysis.
The table shows the total numbers of garnets recovered from each of the locations tested and the related diamond facies.
Further confirmation that the sample material was derived from the diamond stability field of the Earth's mantle is shown in a conventional CaO versus Cr 2 O 3 contents plot for the sixty garnets analysed. (See Figure 1).
Figure 1: Conventional diagram of CaO versus Cr
2
O
3
contents (wt.%) of the 60 garnets recovered from Kuhmo Green
The discovery of the green diamond down-ice, together with the abundance of G10 harzburgitic garnets, including G10D's, and the presence of eclogitic G4 garnets, including G4D's, and pyroxenitic G5D garnets, all indicate a deep-mantle source for kimberlite originating from the diamond stability field where diamonds are formed.
The results indicate that two of the sample locations (A5-23-01 and A5-23-03) are likely to be very close to the kimberlitic source of the green diamond.
This release has been approved by
Professor
"
These results are a further and very important step forward in bringing to a successful conclusion the search for the origin of the green diamond discovered by the Company in the Kuhmo region of
Note: The microprobe used for the electron microprobe analysis was a JEOL JXA-733 Superprobe equipped with 5 wavelength dispersive spectrometers (WDS) and an Oxford Instruments X-act energy dispersive system (EDS).
Samples were run at 15KV, beam current 15na, beam diameter of 5um.
Count times for major elements were 20s on peak and 10s on each side of the peak for background measurements. For trace elements, both peak and background times were 40s.
For calibration a set of microbeam standards of pure metals (from SPI) and natural minerals from the
Further Information:
ProfessorRichard Conroy , Chairman +353-1-479-6180Allenby Capital Limited (Nomad) +44-20-3328-5656Nick Athanas /Nick Harriss Peterhouse Capital Limited (Broker) +44-20-7469-0930Lucy Williams /Duncan Vasey Lothbury Financial Services +44-20-3290-0707Michael Padley Hall Communications +353-1-660-9377Don Hall
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