Temex Achieves Excellent Gold Recoveries up to 98% on Preliminary
Metallurgical Testwork, Whitney Project, Timmins
TORONTO, Feb. 27, 2013 /CNW/ - Temex Resources Corp. (TSX-V: TME, FWB: TQ1)
("Temex" or "the Company") is pleased to announce that it has received
excellent preliminary results of metallurgical testwork on the Hallnor gold
deposit in Timmins, Ontario. The historic and prolific Hallnor mine, the
centerpiece of the Whitney Project, was the highest grade gold producer in the
Timmins camp having produced 1.7 M ounces of gold at 0.40 ounces (12.4 g) gold
per tonne. Current in-pit NI 43-101 compliant resources are 776,100 ounces
grading 2.08 g/t gold measured and indicated, and 231,900 ounces grading 1.79
g/t gold inferred and the deposit is wide open along the mine trend for 2
kilometres to the west including the Broulan Reef Mine.
-- Cyanidation leach tests yielded excellent gold recoveries
ranging between 93 to 98%
-- Leach times are considered fast with low consumption of
-- Gravity tests are considered excellent producing high grade
concentrates and confirming the presence of free gold
-- Gravity concentrate with gravity tail leaching yielded gold
recoveries between 94 to 97%
-- Additional testing could further improve gold recoveries
"We are extremely pleased with the exceptional results of our preliminary
metallurgical testwork at Hallnor which is another important step forward in
our fast-tracking this project on the pathway towards production. The results
today demonstrate that very high gold recovery is achievable and it is
particularly noteworthy that excellent recoveries were achieved on all
testwork methods which indicated not only the presence of free milling gold
that is rapidly recoverable in short time frames but also with low reagent
consumption suggesting low milling costs," commented Ian Campbell, President
The work conducted by SGS Canada Inc. concluded that cyanide leaching on whole
ore at various grinds between K(80) of 51 to 143 microns (µm) produced
excellent gold leach recoveries ranging between 93% and 98% on calculated head
grades ranging between 0.94 to 2.32 g/t gold respectively. Excellent results
were also achieved on a variety of alternate and combined techniques including
gravity concentration, flotation and cyanide leaching. The report
recommended that the potential to reduce milling costs and improve gold
recovery through optimizing these techniques still exists with further testing.
The metallurgical testwork was conducted on three composites: one master
composite (1.91 g/t gold) and one each high grade (3.23 g/t gold) and low
grade (1.22 g/t gold) sub-composites from 180 kg composed of 224 individual
core samples. The core samples were representatively selected from 55 drill
holes across the ore body by P&E Mining Consultants Inc. of Brampton, Ontario
and sent to SGS Laboratories in Vancouver, B.C.
The metallurgical testwork reported here for gold in the three composites
consisted of 1) whole ore cyanidation (CN) extraction, 2) gravity
concentration recovery, 3) whole ore flotation recovery, 4) gravity tail
flotation recovery, and 5) gravity tail CN extraction. Table 25 from the SGS
report is presented below:
Table: Comparison of Gold Recovery using Different Circuit Configurations
Composite Circuit Test Approximate Grind Size Excluding
Plus 100 µm 60-100 µm 30-60 µm
(microns) (microns) (microns)
Gravity GR1 34.0
Whole ore F3, F2, F1 92.1 94.8 95.0
Gravity tail F6, F5, F4 84.8 86.4 91.4
Gravity + GR1 + F6, 90.0 91.0 94.3
Master gravity tail F5, F4
Whole ore CN1, CN2, 93.5 95.3 97.8
Gravity tail CN4, CN5, 91.4 94.3 94.3
Gravity + GR1 + CN4, 94.3 96.2 96.2
gravity tail CN5, CN6
Gravity GR2 42.8
Whole ore F9, F8, F7 87.9 89.4 91.0
Gravity tail F12, F11, 82.1 85.7 90.6
Gravity + GR2 + F12, 89.8 91.8 94.6
Sub-Composite gravity tail F11, F10
Whole ore CN7, CN8, 92.9 95.9 96.8
Gravity tail CN10, 92.3 93.6 94.0
leaching CN11, CN12
Gravity + GR2 + 95.6 96.3 96.6
gravity tail CN10,
leaching CN11, CN12
Gravity GR3 45.0
Whole ore F15, F14, 89.4 85.2 90.4
Gravity tail F18, F17, 86.0 82.4 88.8
Gravity + GR3 + F18, 92.3 90.3 93.8
Sub-Composite gravity tail F17, F16
Whole ore CN13, 93.6 95.8 97.2
leaching CN14, CN15
Gravity tail CN16, 91.6 92.4 90.9
leaching CN17, CN18
Gravity + GR3 + 95.4 95.8 95.0
gravity tail CN16,
leaching CN17, CN18
Whole Ore CN Leaching
All the whole ore leach tests, irrespective of the variable tested, produced
excellent gold leach recoveries ranging between 93% and 98% at respective
grind sizes of 80% passing 50 µm (microns) up to 143 µm (microns). The
results show that gold leach recovery increased with fineness of grind with
the best results achieved at finer grinds. The first 6 hour gold leach kinetic
tests were fast and extending the leach time beyond 24 hours did not improve
the results. The cyanide and lime consumptions were less than 0.5 kg/t and 0.8
kg/t respectively and are considered low.
Flotation tests on whole ore produced excellent gold recoveries ranging
between 85% and 95% for all three composites at grind sizes between K(80) of
52 to 161 µm (microns). The flotation of gravity tails resulted in gold
recoveries of 82 to 91%.
The combination of gravity + gravity tail flotation resulted in gold
recoveries of 90 to 95%.
Each composite test charge was ground to the target size and tested using a
laboratory model Knelson MD-3 concentrator prior to being upgraded on a Mozley
mineral separator. The gravity concentrate was assayed to extinction for
gold by standard fire assay methods. The gravity tailings gold assays were
assayed in duplicate. The report concluded that gravity separation at grinds
of 80% passing 133 to 143 µm (microns) recovered 34 to 45% of the gold in the
concentrate and were considered "excellent". The concentrate grade ranged from
1,136 g/t to 3,046 g/t gold at upgrade ratios of 854 to 1081 times head grade.
The combination of gravity + gravity tail leaching increased the gold recovery
to 94 to 97%.
The gold assays of the composites were determined by pulp and metallic (P&M)
approach. The gold assays of the composites were determined by screen
analyses protocol, screening at 150 mesh (105 microns).
Pulverizing/screening at 150 mesh continued until the oversize fraction was
approximately 30 to 50 grams at which point the coarse fraction was analyzed
for gold to extinction by standard fire assay methods and the combined fine
fraction was blended, riffled down and assayed in duplicate.
Work Program and Outlook
The ongoing metallurgical program will follow up on the SGS recommendations
towards optimizing processing techniques and operating cost saving
opportunities. The objectives will be to investigate and compare the
benefits of stand-alone vs. custom milling opportunities as a number of gold
milling facilities are located close by, may be amenable to this ore type and
prove economically even more attractive.
The Whitney Property is held under a joint venture in which Temex owns 60% and
Goldcorp Canada Ltd. (("Goldcorp"), on behalf of the Porcupine Gold Mines
Joint Venture (a joint venture between Goldcorp Inc. and Goldcorp)) owns
40%. Temex is the operator of the joint venture.
The NI 43-101 resource on the Upper Hallnor portion of the Whitney Property
announced in September 2012 is summarized below for the in-pit resources and
is shown on a 100% basis.
Mineral Resource Upper Hallnor In-pit at 0.30 g/t Au cut-off grade (news
release September 5, 2012)
-- Measured ("M"): 232,100 ounces contained in 2,964,000 tonnes at
a grade of 2.44 g/t gold
-- Indicated ("I"): 544,000 ounces contained in 8,664,000 tonnes
at a grade of 1.95 g/t gold
-- TOTAL M+I: 776,100 ounces Measured and Indicated in 11,628,000
tonnes at a grade of 2.08 g/t gold
-- Inferred: 231,900 ounces contained in 4,024,000 tonnes at a
grade of 1.79 g/t gold
The contents of this press release have been approved by independent Qualified
Persons Alfred Hayden, P.Eng. and Eugene Puritch, P.Eng. of P&E Mining
Consultants Inc. This press release has also been reviewed by Jalal Tajadod,
PhD, P.Eng. and Jake Lang, B. E. Sc. of SGS Canada Inc.
About Temex Resources Corp.
Temex is a Canadian based exploration company focusing on its portfolio of
precious metals properties in Northeastern Ontario, a world class mining
district. Temex (60% interest) is exploring the Timmins Whitney Property, in
partnership with Goldcorp (40% joint venture interest; no back-in rights), and
the Juby Gold Project.
The Whitney Property has open pit and underground NI 43-101 compliant
resources on the Upper Hallnor of 3.0 million tonnes at a grade of 2.44 g/t
gold for 234,300 ounces of gold in the Measured category, 8.8 million tonnes
at a grade of 1.97 g/t gold for 555,900 ounces of gold in the Indicated
category, and 4.1 million tonnes at a grade of 1.82 g/t gold for 241,000
ounces of gold in the Inferred category, at a cut-off grade of 0.30 g/t gold
for open pit and 2.0 g/t for underground (Note 1).
The Juby Main Zone has NI 43-101 compliant resources of 22.3 million tonnes at
a grade of 1.30 g/t gold for 934,645 ounces of gold in the Indicated category
and 28.2 million tonnes at a grade of 1.00 g/t gold for 905,621 ounces of gold
in the Inferred category, both at a cut-off grade of 0.40 g/t gold (Note 2).
1. Information regarding the mineral resource estimate on the Upper
Hallnor is in the Company's news release dated September 5, 2012
and the technical report filed on SEDAR October 19, 2012. The
Mineral Resource Statement was prepared for Temex by P&E Mining
Consultants Inc. of Brampton, Ontario in accordance with NI 43-101
by Richard Sutcliffe, PhD, P.Geo., Eugene Puritch, P.Eng., David
Burga, P.Geo., Yungang Wu, P.Geo., Tracy Armstrong, P.Geo., and
Antoine Yassa, P.Geo., "independent qualified persons" as defined
by NI 43-101.
2. Information regarding the mineral resource estimate on the Juby
Main Zone is in the Company's news release dated January 16, 2012
and the technical report filed on SEDAR February 28, 2012. The
Mineral Resource Statement was prepared for Temex by GeoVector
Management Inc., Ottawa, Ontario in accordance with NI 43-101 by
Joe Campbell, BSc, P.Geo., Alan Sexton, MSc, P.Geol., and Allan
Armitage, PhD, P.Geol., "independent qualified persons" as defined
by NI 43-101.
Forward Looking Statements:
This news release includes certain "forward-looking statements". Such
forward-looking statements involve risks and uncertainties. The results or
events predicted in these forward-looking statements may differ materially
from actual results or events. The Company disclaims any intent or
obligation to update any forward-looking statement, whether as a result of new
information, future events or results or otherwise.
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SOURCE: Temex Resources Corp.
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