Pre-concentration test results on low-grade mineralization at Granada Gold Mine return 6.0 grams per tonne gold
Pre-concentration test results on low-grade
mineralization at Granada Gold Mine return 6.0
grams per tonne gold
ROUYN-NORANDA, QC
,
March 18, 2019
/CNW/ - Granada Gold Mine (TSXV: GGM) ("Granada
Gold" "GGM" or the "Company") is pleased to report on the results of a preliminary gravity
separation study that demonstrates the positive impact of pre-concentrating lower-grade, gold-
bearing rock from its Granada Gold project in
Rouyn-Noranda, Quebec
.
The higher grades attained during the tests may have implications for the grade of future mill feed,
the size of the gold deposit, and the costs associated with future mine production.
Mr.
Frank Basa
, Chairman and CEO of Granada Gold, stated, "These metallurgical results can
further de-risk the project and provide additional processing options for the company, and they
potentially expand the existing resource by lowering the average gold grade that could be mined and
processed using pre-concentration by gravity separation."
The preliminary gravity test work, part of a suite of tests on rock samples from the Current
Resources at the Granada Gold Mine project, was conducted by industry leader Gekko Systems of
Ballarat,
Australia
. Their innovative pre-concentration system increases recovery values, reduces ore
mass and waste, reduces water use, lowers power requirements, and improves feed rates, all
potentially meaning lower capital and operating costs for
Granada
along with higher recovery rates.
To summarize results, a 260-kilogram sample of low-grade drill core assaying 0.6 grams of gold per
tonne was upgraded to 6.0 grams per tonne with a 60 percent overall recovery. The Gekko
laboratory processed the sample by crushing through different size fractions, homogenized, and split
according to standard lab practices. Gravity tests were conducted on coarse and fine fractions,
approximately +600 µm and -150 µm, respectively.
A grade of 21 grams per tonne gold was achieved from the coarse size fraction, with a recovery of
40%, resulting in an upgrade ratio (conc./feed) of 35. The test result which recovered the most gold
has a gravity concentrate grade of 6.0 grams per tonne gold with a gold recovery of 60 percent (see
Table 1 below).
Management of Granada Gold understand that conventional mining and processing leave behind
significant amounts of gold and other metals which could have potential economic value.
"As a result of this preliminary work, we believe that employing disruptive technologies on lower
grade ore to pre-concentrate the mineralized material for process plant feed can be advantageous,"
said Basa. "This approach can be used to evaluate the potential to increase the gold resource and
other recoverable metals which, in turn, will lower project capital and operating costs."
TABLE 1. Gekko Study Gravity Test Results
Sample
Conc.
Mass
Yield (%)
Au
Recovery
(%)
Ni
Recovery
(%)
S
Recovery
(%)
Cu
Recovery
(%)
Conc. Au
Grade
(ppm)
Upgrade
Ratio
(Conc/Feed)
Coarse Gravity Test, P100 1.18mm and P100 0.6µm
Coarse
1.1
39.1
6.6
41.9
5.1
21.3
35.5
Coarse
3.3
54.5
10.6
60.7
16.4
9.8
16.3
Coarse
5.9
59.7
13.3
65.8
18.9
6.0
10.0
Fine Gravity Test, P100 850, 425 and 150µm
Fine
1.3
33.0
3.3
34.4
5.1
14.6
24.3
Fine
3.1
47.0
6.8
54.4
10.7
8.8
14.7
Fine
4.9
51.0
8.4
58.7
13.7
6.0
10.0
In a related matter, the company has also begun a test program using the pilot plant of its sister
company, Canada Cobalt Works (TSXV: CCW). In this first round of tests, a 120-kilogram sample of
low-grade mineralized rock from the Granada Gold Mine waste dump was processed by screening
the material into three screen sizes followed by gravity separation. These concentrates were then
analyzed for gold, silver, cobalt, nickel, and copper (see Table 2 below).
TABLE 2. GGM Waste Rock Head Assay
Sample
Au (g/t)
Ag (g/t)
Co (ppm)
Ni (ppm)
Cu (ppm)
Coarse Head Assays, P100, 0.84mm, 0.84mm - 3.2mm, 3.2mm - 19mm
Coarse
1.01
0.6
34
84
134
Coarse
0.34
0.2
23
74
88
Coarse
1.54
1.8
42
0
86
The results are head assays of each screen class. Gravity assay test results are pending, with a
particular focus on recoverable base metals.
The current feasibility study for the onsite gold mine and plant at
Granada
has been put on hold
pending results of the metallurgical studies. The environmental studies to install a 600-tonne-per-day
gravity leach plant are ongoing at the Canada Cobalt Works Castle mine. The flowsheet has been
completed and equipment has been sourced.
Qualified Person
The technical information in this news release was prepared under the supervision of
Frank J. Basa
,
P.Eng., Granada Gold Mine's Chairman and Chief Executive Officer, who is a member of
Professional Engineers Ontario and a qualified person in accordance with National Instrument 43-
101.
About Granada Gold Mine Inc.
Granada Gold Mine Inc. continues to develop the Granada Gold Property near
Rouyn-Noranda,
Quebec
. Approximately 120,000 meters of drilling has been completed to date on the property,
focused mainly on the extended LONG Bars zone which trends 2 kilometers east-west over a
potential 5.5 kilometers of mineralized structure. The highly prolific Cadillac Break, the source of
more than 75 million plus ounces of gold production in the past century, cuts through the north part of
the
Granada
property.
The Company is in possession of all permits required to commence the initial mining phase, known
as the "Rolling Start", which allows the company to mine up to 550 tonnes per day, capable of
producing up to 675,000 tonnes of ore over a 3-year period. Additional information is available at
www.granadagoldmine.com
.
"Frank J. Basa"
Frank J. Basa P. Eng
.
Chief Executive Officer and Chairman
Neither the TSX Venture Exchange nor its Regulation Service Provider (as that term is defined in the
policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this
release. This news release may contain forward-looking statements including but not limited to
comments regarding the timing and content of upcoming work programs, geological interpretations,
receipt of property titles, potential mineral recovery processes, etc. Forward-looking statements
address future events and conditions and therefore, involve inherent risks and uncertainties. Actual
results may differ materially from those currently anticipated in such statements.
SOURCE
Granada Gold Mine Inc.
View original content:
http://www.newswire.ca/en/releases/archive/March2019/18/c5245.html
%SEDAR: 00004087E
For further information:
Eric Owens, PGeo, President, 1-416-509-5385 or
[email protected], andWayne Cheveldayoff, Corporate Communications, 416-710-
2410 or [email protected]
CO: Granada Gold Mine Inc.
CNW 11:02e 18-MAR-19