|
 |
Carbonatites
are rare intrusive bodies generated by
the melting of rocks at great depths within the
Earth's
crust (~200km). As their name suggests,
they are made up for the most part of carbonate minerals
(calcite, dolomite, ankerite). |
|
Because of their
provenance, carbonatites are
known to carry metals and minerals not commonly found in
other rock types. They are the only economic source for
niobium, a metal used mainly in high temperature and
high tensile strength steel alloys, rare earth elements,
a series of elements with unique properties sought by
the high-tech industry and a privilege source for
tantalum, phosphorus and fluorite.
No two carbonatite intrusives are alike and this is
reflected in the diversity of the mineral deposits that
may result. One of the largest copper mine in the world
is located on the Palabora Carbonatite and has been in
production continuously since 1964 operated by the
mining giant RTZ. Current reserves are adequate to
extend the mine life over the next 30 years. Also, the
Premier Mine in South Africa which consists mainly of
kimberlitic rocks contains a core of carbonatite. This
mine is known to have produced the largest diamond ever
at 3106 carats and has been in operation since 1902 with
brief interruptions during war periods. Carbonatites are
well known to host sizeable deposits that are relatively
predictable in their extension. The Niobec Mine located
in the Saguenay region of Québec, owned and operated by
Cambior, has been producing niobium since 1975 from two
lenses and despite continuous mining for nearly 30
years, the current reserves are sufficient for further
20 years without any exploration. NioGold recognized the
potential of carbonatites and therefore decided to
acquire two intrusive bodies, both located in Québec,
for their unique characteristics.
The Montviel Carbonatite is located some 200km due north
from Val-d’Or and is accessible through an all-weather
gravel road extending from road 113 linking Val-d’Or and
Chibougamau. The property was acquired through an option
with Nomans Resources. Through a number of expansions,
the property now covers some 4333hectares forming an
irregular block of 79 mining cells. The carbonatite has
only been briefly explored since its discovery by Jowsey
Mining in 1958 while drilling for base metals on a
geophysical target. From the scarce geological data
available, the complex is made up of several syenite
facies forming an irregular bilobate structure around a
core of carbonatite. The carbonatite, per say, is also
composed of facies with distinct iron, magnesium or
calcium content as reflected in the mineralogy. From the
extrapolation of the geophysical signature, the complex
would extend over 8 by 3 km making it one of the largest
alkaline intrusive in Canada.
From an exploration perspective, the property is host to
several niobium, rare earth elements and phosphorus
zones. Economic values of all three elements were
obtained by Nomans Resources during diamond drilling
program completed in the winter of 2002. Since the
acquisition, NioGold flew a high-resolution airborne
survey over the complete property. The results from this
survey combined with the previous results will be used
to fine-tune the targets in a major upcoming diamond
drilling program planned for the fall of 2004.
NioGold is confident that this diamond drilling program
will generate results that will help outline the true
potential of the property. |