Diagem's Chapadao Diamondiferous Rocks Proven to Be Kimberlitic
27 Noviembre 2007 - 9:58AM
Marketwired
MONTREAL, QUEBEC ("Diagem" or "the Company") is pleased to
report the results of a comprehensive petrographic, mineralogical,
and geochemical study performed on 15 samples collected from 7
diamondiferous sites on Diagem's Chapadao properties within the
Juina Diamond Province of Mato Grosso, Brazil. The study
establishes the volcanic and kimberlitic nature of the host rocks
for most of the diamondiferous localities sampled on the
Chapadao.
Denis Francoeur, Diagem's CEO commented: "The study confirms the
interpretation of our Chief Geologist, Paulo Andreazza. His
determination, persistence and geological acuity led to the
discovery of a cluster of kimberlites now proven to be true
kimberlites. The importance of the discovery resides in that it is
recognized to be a significant source of the alluvial diamonds
accumulated in the river beds draining the Chapadao, a regional
elevated plateau. The permitting process is in progress in
preparation for large-scale bulk sampling and drilling (both
diamond drilling and reverse circulation drilling)".
Petrographic examination revealed that almost all but two of the
Chapadao sample sites correspond to volcanic (kimberlite) crater
structures. These rocks demonstrate some characteristic features
that clearly point to their kimberlitic nature, specifically, the
presence of inclusions with relicts of a parquet-like olivine
replacement structure and picroilmenite grains with intact
leucoxene rims. Since such fine structural details cannot survive
during prolonged transportation of clastic material, these samples
are believed to represent rocks from crater parts of kimberlite
pipes.
The heavy mineral fraction of the examined samples shows a quite
poor spectrum of kimberlite indicator minerals ("KIM"), which are
dominated by picroilmenite, with only a few chrome spinel grains
present in some samples. Pyrope, olivine, and chrome-diopside were
not found at all. These results coincide well with a previous
mineralogical study of samples from the Juina area (Kaminsky and
Sablukova, 2007) (see press releases dated October 10 and September
27, 2007). The high picroilmenite content and the presence of
chrome spinel grains both confirm the kimberlitic nature of the
samples.
By looking at specific geochemical elements, the tuffites of the
Chapadao pipes and weathered oxidized clay-rich material from the
Collier-4 kimberlite pipe are similar to Group 1 South African
kimberlites, Fe-Ti series kimberlites of the Arkhangelsk diamond
province, and Yakutian kimberlites. In some characteristics, these
rocks are similar to West Australian lamproites.
The study was conducted by renowned diamond consultant Dr. Felix
Kaminsky and colleagues at the KMD/Institute of Diamonds laboratory
in Moscow, Russia. The identification procedure included visual
examination of the samples, petrographic examination of thin
sections, full-silicate analysis and ICP-MS analysis using an
Elan-6100 analyzer, and a mineralogical analysis for KIM. Computer
processing and interpretation of analytical data were performed
based on the comparison of obtained results with available data on
rocks from the main kimberlite provinces of the world and on
non-kimberlitic diamondiferous igneous rocks from different regions
worldwide.
This press release has been reviewed by Mousseau Tremblay, Ph.D,
P. Eng., Diagem's Chairman and a qualified person under National
Instrument 43-101.
About Diagem
Diagem Inc. is a publicly listed Canadian exploration mining
company focused on primary diamondiferous resources in the Juina
Diamond Province of Mato Grosso, Brazil, where it controls a large
portfolio of mineral properties. The Company has one advanced
development stage project and recently discovered two clusters of
kimberlite pipes believed to be the main sources of Juina's
historical alluvial diamond production. The historical Juina
alluvial diamond production is commonly referred to as "Indian
goods" based on the generally low quality of the diamonds. However,
the Chapadao area is accessible year round and is amenable to open
pit mining which translates into low extraction costs. Preliminary
diamond grades are also encouraging (see press release dated
January 11, 2007). The area is also known for the occurrence of a
valuable rare type of diamonds often harbouring a fancy pink color
(see press release dated November 13, 2007).
Forward-looking statements: Except for statements of historical
fact, all statements in this news release, without limitation,
regarding new projects, acquisitions, future plans and objectives
are forward-looking statements which involve risks and
uncertainties. There can be no assurance that such statements will
prove to be accurate; actual results and future events could differ
materially from those anticipated in such statements.
THE TSX VENTURE EXCHANGE DOES NOT ACCEPT RESPONSIBILITY FOR THE
ADEQUACY OR ACCURACY OF THIS PRESS RELEASE
Contacts: Diagem Inc. Denis Francoeur CEO 514-866-6001 (ext 265)
Diagem Inc. Paul Einarson CFO 514-866-6001 (ext 251) Diagem Inc.
Nicole Blanchard Investor Relations 450-973-6690 WWW.DIAGEM.COM
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