Continental Nickel Confirms High Recoveries to High Grade Concentrates
15 Setembro 2011 - 3:15PM
Marketwired Canada
Continental Nickel Limited (TSX VENTURE:CNI) ("CNI" or the "Company") is pleased
to announce the production of high grade concentrates from the initial "sighter"
flotation tests on composites from the various ore zones at the Ntaka Hill
Nickel Project ("Ntaka Hill"). Highlights of the initial tests include
concentrates containing between 16.7% Ni and 18.6% Ni at between 84.2% and 90.2%
recovery from Sleeping Giant zone composites, 17.2% Ni at 88.1% recovery from M
zone composite and 15.0% Ni at 88.1% recovery from H zone composite. The
flotation tests were carried out by G & T Metallurgical Services Ltd, part of
the ALS Group of companies, quality accredited under ISO 9000:2008.
For detailed results see Table 2.
Ntaka Hill is part of the 75:25 Nachingwea exploration joint venture property in
southern Tanzania with IMX Resources Limited of Australia. Ntaka Hill has
currently identified resources as outlined below in Table 1.
Table 1 - Ntaka Hill Resources Summary
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Tonnes
Resource Category (000's) % Ni % Cu Contained Ni (tonnes)
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Measured & Indicated 4,981 1.22 0.24 60,900
Inferred 17,260 0.76 0.17 131,000
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Note: Resources calculated at a US$17/tonne Net Smelter Return ("NSR") cut-
off. See CNI press release April 15, 2011.
Low Contaminant Levels
All concentrates have exhibited low contaminant levels and, especially
significant for nickel concentrates, magnesium oxide (MgO) graded between 1.5%
MgO and 3.9% MgO, which is low by global standards.
Also very significant, analysis of other contaminant elements, such as arsenic
(As), antimony (Sb), chromium (Cr), lead (Pb) and zinc (Zn), returned low
levels. For detailed results see Table 3 which may be viewed using the link
provided with this release.
Conventional Processing Technique
The flotation tests were at a moderately coarse grind size of 106 micrometres
(P80) using only a simple reagent scheme of collector and frother, and three
stages of cleaning. This represents a very conventional processing technique for
the production of nickel concentrate from nickel sulphide ore.
Comminution Testing
The results for the Bond Rod Mill Work Index tests on three ore zone composites
ranged between 4.7 to 8.9 kWh/t with an average of 6.7 kWh/t (not all composites
had sufficient sample available). The results for the Bond Ball Mill Work Index
tests on all ore zone composites range between 12.2 to 15.9 kWh/t with an
average of 14.8 kWh/t.
These work index results are typical for hard rock sulphide ores and as such
confirm the suitability of a conventional comminution circuit with typical
operating costs.
Mr. David Massola, President and CEO, commented, "I am extremely pleased with
the results of these metallurgical tests which confirm that concentrate produced
from this project will be highly marketable and compare favorably to the best
nickel sulphide mines in the world. In addition, indications are that high
nickel recoveries are achievable using conventional processing technology which
greatly reduces technical and start-up risk. The high grade concentrate will
also further reduce our low expected transport costs to the Port of Mtwara which
is less than 300km from the project site with only around 95km of the route on
unsealed road."
Sample Selection
The samples were selected in co-operation with Ms Patricia Tirschmann, CNI's VP
Exploration, to represent the range of mineralisation exhibited in the various
ore zones and to spatially intersect the larger areas of the ore zones. Samples
were not selected from all ore zones with L and NAD13 zones excluded due to
their geological similarity with other ore zones and their relatively small
size.
Next Steps
Following the completion of detailed quantitative mineralogy examination
utilising QEMSCAN and optical methods, further flotation test work will address
improving both concentrate grade and recovery through optimisation of grind size
and reagent additions. The test work program will also be used expand the
understanding the geo-metallurgical domains within the various ore zones and
enable development of grade recovery relationships that will allow various
optimisation studies to be undertaken for the project.
Fresh core from additional metallurgical drilling planned in 2011 will allow an
extensive metallurgical test work program to be undertaken which will provide
definitive performance and engineering design data for the project. It is
intended that this test work program will be undertaken in the first half of
2012.
Qualified Persons
The quality control, technical information and all aspects of the metallurgical
test work program are supervised by Mr Peter Munro FAusIMM, Senior Principal
Consulting Engineer with Mineralurgy Pty Ltd an independent consultant to CNI.
The information in this release was prepared under the direction of Mr Munro. Mr
Munro, a Fellow within the Australasian Institute of Mining and Metallurgy, is a
qualified person as defined by National Instrument 43-101 and consents to the
inclusion of the data in the form and context in which it appears.
About Continental Nickel Limited
Continental is focused on the exploration, discovery and development of nickel
sulphide deposits in geologically prospective, but under-explored regions
globally. The Company's key asset is its 75% interest in its Nachingwea property
in Tanzania, where Mineral Resources (Measured and Indicated) have been
estimated at 60,900 tonnes of contained nickel, and an additional 131,000 tonnes
of contained nickel in Inferred Mineral Resources (CNI press release April 15,
2011). The project is a 75:25 exploration joint venture between the Company and
IMX Resources Limited.
The Company also has an option to joint venture on the St. Stephen project in
New Brunswick, Canada where the 2010 diamond drill program discovered new Ni-Cu
sulphide zones.
As at the date of this release, the Company has 42,713,508 common shares issued
and outstanding (51,031,914 on a fully-diluted basis) and trades on the TSX
Venture Exchange under the symbol CNI. The Company remains well funded with over
C$8.7 million in the treasury as at March 31, 2011.
On behalf of
Continental Nickel Limited
Dave Massola, President and Chief Executive Officer
CAUTIONARY STATEMENT: No stock exchange, securities commission or other
regulatory authority has approved or disapproved the information contained
herein. This News Release includes certain "forward-looking statements". All
statements other than statements of historical fact included in this release
including, without limitation, statements regarding potential mineralization,
potential or estimated metal recoveries, resources and reserves, exploration
results, future plans and objectives of Continental Nickel Limited, is
forward-looking information that involves various risks and uncertainties. There
can be no assurance that such information will prove to be accurate and actual
results and future events could differ materially from those anticipated in such
information. Important factors that could cause actual results to differ
materially from Continental Nickel Limited's expectations are the risks detailed
herein and from time to time in the filings made by Continental Nickel Limited
with securities regulators.
Table 2 - Detailed Flotation Test Results
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Ore Zone Resources (1)
-------------------------------------------------------------
Category Tonnes (000) Grade % Ni Grade % Cu
----------------------------------------------------------------------------
H M + I 1,003 1.303 0.187
Inferred 620 0.98 0.14
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M M + I 526 1.673 0.350
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J M + I 1,026 1.444 0.224
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G Indicated 1,990 0.652 0.175
Inferred 1,240 0.53 0.16
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Sleeping Giant Inferred 15,400 0.77 0.17
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L M + I 202 2.591 0.487
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NAD013 M + I 234 2.562 0.567
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Ore Zone Composite Head Grade Concentrate Grade Recovery
-------------------------------------------------
%Ni %Cu %Ni %Cu %MgO Ni Cu
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H H 0.77 0.11 15.0 2.26 3.90 88.1 93.1
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M M 1.49 0.49 17.2 6.10 2.31 88.1 95.5
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J J (2) 1.46 0.25 8.6 1.58 1.64 83.9 89.4
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G G (2) 0.45 0.15 3.2 1.13 2.40 82.3 87.4
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Sleeping Giant SG1 (3) 0.70 0.13 16.7 3.58 2.46 84.2 94.7
-------------------------------------------------------------
SG2 (3) 0.68 0.15 17.7 4.33 2.10 90.0 97.6
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SG3 (3) 1.51 0.33 18.6 4.36 1.51 90.2 97.4
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L Not Tested
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NAD013 Not Tested
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Notes:
1. Resources calculated at a US$17/tonne Net Smelter Return ("NSR") cut-off.
See CNI press release April 15, 2011.
2. J and G Zone flotation performance, in particular concentrate grade, was
predicted to be slightly retarded due to the higher pyrrhotite levels in
the mineralisation in these ore zones (previous work by Xstrata Process
Support, June 2009 and February 2011, indicated Po:Pn ratios of 4.1 for J
zone and 11.1 for G zone, compared with a range of between 0.25 to 2.1
for the other ore zones). The concentrate may therefore be diluted by
high levels of pyrrhotite as the test scheme included no specific
additions, such as lime, to depress pyrrhotite flotation.
3. SG 1, SG 2 and SG 3 composites represent three different mineralisation
types from the Sleeping Giant ore zone being disseminated, stringer and
bleb and semi massive sulphide.
4. M + I = Measured + Indicated
To view Table 3 - Minor Element Assays, please visit the following link:
http://media3.marketwire.com/docs/cnitab3.pdf
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