heavy minerals, kimberlite indicators, Quaternary geology, pyrope, geochemistry, mineral exploration
All aspects of kimberlite indicator studies, from field sampling of sediments to arrangements for
microprobe analysis, can be handled. Heavy mineral concentrates are examined under a binocular
microscope (Zeiss Stemi SR) equipped with a micro conveyor belt. The final selection of mineral
grains for analysis is done under X-polars in order to identify minerals which can be confused with
the principal kimberlite indicators.
Diamonds, or other resistant minerals of interest, can then be examined by microprobe or
X-ray diffraction.
Microprobe results can also be presented in diagram form.
Recovery of Micro-diamonds
Diamonds can be recovered from heavy mineral concentrates by means of
caustic dissolution. A combination of dissolution in caustic NaOH and digestion in acids, reduces the heavy mineral
concentrate leaving highly resistant diamonds unaffected. The resulting residue, which may also include other resistant
minerals, such as zircon, chromite, kyanite, perovskite, and moissonite, is much more easily examined for diamonds.
Consorminex Title Page |
Geochemical surveys |
Sample preparation |
Heavy mineral analysis |
Gold grain studies |
Kimberlite indicators |
Pebble lithology |
Photos of heavy minerals |
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