The latest Investing Matters Podcast episode featuring Jeremy Skillington, CEO of Poolbeg Pharma has just been released. Listen here.
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Garnets classified as eclogitic G3, G4, and harzburgitic
G10, especially those with a ‘D’ suffix, are regarded
as being particularly indicative of an association with
diamond. G1, G5, G5D, G9, G11, and G12 garnets
are also all classed as indicator minerals (see Table 9).
However, much of the classification scheme by Grütter
et al. (2004) is empirical, with boundaries between fields
based on the capture of 80 to 90% of grains with particular
characteristics. Consequently, G9 garnets, for example,
should not necessarily be considered to be poorlyprospective for diamonds. In fact, numerous examples
of diamondiferous kimberlites and lamprophyres contain
garnet populations dominated by G9 rather than G10
garnets (Hutchison and Frei, 2009). It is notable that the
G9/G10 ratio of Northern Territory’s Merlin kimberlitesourced garnets is close to 11.0 (Reddicliffe, 1999). Of
all reported grain analyses, G9s constitute 47% of those
falling into either the G9 or G10 fields
G10D garnets suggests they have crystallized at a minimum pressure of about 40 to 45 kbar (4-4.5 GPa). The occurrence of diamond stability field garnets (G10D) is a clear indicator of the potential of this kimberlite for diamond. The chemistry of the garnets suggests that the source for the kimberlite was a lherzolite that has suffered a partial melting that formed basaltic magma, leaving a harzburgite as a residue.
PROF SAID very technical announcement last week ,looks fantastic to me .....
Harzburgitic (G10)
Gurney (1984) correlated 85% of peridotitic garnet inclusions in diamonds from global sources with the Ca-poor, Cr-rich harzburgitic pyrope cluster 10 of Dawson and Stephens (1975) and in doing so “branded” the G10 garnet standard with which the diamond potential of exploration projects
Based on garnet compositions, the majority of the diamondiferous microxenoliths is lherzolitic (G9)
Studies of kimberlites and their mantle xenoliths provide fundamentally important information about the composition, structure, and melting history of the subcratonic mantle. Kimberlites are also economically important, as they are a major source of diamonds. Kimberlites are hybrid rocks consisting of minerals of different origins: xenogenic minerals produced by the fragmentation of foreign mantle and crustal rocks, primary minerals crystallized from kimberlite melt, and later minerals formed during the post-magmatic alteration of kimberlites. The mineralogy of individual kimberlites may be extremely variable and complex. Garnet, chromite, ilmenite, chromium diopside, and olivine occur in kimberlites in significantly higher quantities than diamonds. As kimberlite indicator minerals, they are used for diamond prospecting, as well as for the primary assessment of whether a target kimberlite is diamond-bearing or not. Thus, the interpretation of mineralogical data is essential for an understanding of both kimberlite petrogenesis and diamond potential.
Sixty garnets from a series of locations were submitted to Renaud Geological Consulting Ltd in Canada for detailed
Electron Microprobe Analysis, having been picked from till samples by Overburden Drilling Management Limited
(“ODM”) (as announced by the Company on 19 December 2023).
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.
Prof mentioned in Sunday Roast midweek takeaway podcast
The garnet’s origin from diamond stability field close by from the garnets process from A5 Kuhmo ( green diamond)
If you discover a diamond stability field you have a significant discovery on your hands
This is the biggest important thing
These diamond-baring magmas of diamond-baring rocks, kimberlite or in rarer instances
Lamproites 💎🔬🇫🇮🥳
have we found the next world class province of diamonds in Kuhmo and full of fancy gems 💎
After 23 targets excavated by diggers we have proven to has not only tracked the diamond garnets and also passed them where we lost the trace.
Proven its in our back yard
Also note
The Riihivaara 26 exploration permit covers Karelian Diamond’s kimberlite (olivine lamproite) discovery at Riihivaara. Exploration permits Riihivaara 24, 24a and 24b cover the adjacent areas. The Riihivaara permits are in an emerging kimberlite field, in which the Company has to date identified 20 regional anomalies.
lamproite🤔
That’s a different location from A5
Close but different
MICRO-DIAMOND RESULTS PROVIDE CONCLUSIVE EVIDENCE THAT SEITAPERÄ KIMBERLITE PIPE IS DIAMONDIFEROUS
• 67 Diamonds Recovered From 100 kg Seitaperä Kimberlite Sample
• Diamond Population Includes 61 Micro-Diamonds and Six Macro-Diamonds
• Stones Show Good Colour Characteristics And High Level Of Preservation
• Good Access And Infrastructure Enhance Overall Status Of Project
Another Project near but same area 🤔🇫🇮
Emerging province?