Golden Dawn Minerals Inc.: Pre-Concentration Test for Lexington Mine Samples Shows Increase in Gold Grade Up to 12.6 g/t Gold...
22 February 2018 - 7:05PM
Wolf Wiese, CEO of Golden Dawn Minerals Inc. (TSX-V:GOM)
(FRANKFURT: 3G8A) (OTC:GDMRF) (the “
Company” or
“Golden Dawn”), announces preliminary results
from pre-concentration testing of samples from the Lexington
property, part of the Greenwood Precious Metals Project.
Golden Dawn provided 140 kg of mineralized
samples (originating from the Lexington Mine for pre-concentration
testing using the Steinert multi-sensor sorting system (KSS). The
samples were collected and prepared from oversized material that
was remaining from the 2008 mining operation. The sorting test work
was conducted at the facilities of Steinert US in Walton,
Kentucky.
The purpose of the test work was to determine
the sorting efficiency of a Steinert Combined Sensor Sorting System
on the samples provided. This machine measures the X-ray
attenuation of each rock particle and this is utilized to separate
high density from low density particles. Typically, the denser
material is better mineralized and the less-dense material is
low-grade or waste material.
The sorted samples were weighed and sent for
independent laboratory analyses by SGS, an ISO 17025 accredited
laboratory located in Lakefield, Ontario.
RESULTS
Two size fractions (-70 +30mm and -30 +10mm)
were tested separately using a combination of XRT and 3D Laser
sensors. Both size fractions showed good results in terms of
upgrade and recovery. The fine size fraction -30 +10mm showed
slightly better upgrades and recoveries. For the -30mm +10mm
particle size, the gold grade was upgraded from 8.0 grams per tonne
(g/t) to 12.5 g/t with a 90 % gold recovery and a mass rejection of
42%. For the coarser -70mm +30mm sample, the gold grade was
upgraded from 9.6 g/t to 11.6 g/t, with a gold recovery of 86% and
a mass rejection of 29%. High mass rejection of low grade material,
between 42% and 28% of the respective samples, was obtained while
still achieving good gold recoveries of 85% to 90%. Copper
upgrading was also observed but final analytical data is still
pending for some products. Full details are described in the
preliminary report, which will be posted on the Company
website.
DISCUSSION
The positive sorting response shows that the
gold and copper grade of material extracted from the Lexington mine
can be upgraded prior to processing at the existing Greenwood
Process Plant. This would indicate a potential to increase mining
rates and/or improve mill head feed grades. The mine could extract
a larger resource at a lower cut-off grade or alternatively, ore
sorting could be utilized to counter the effect of excess mining
dilution. Therefore, the sorting process provides an opportunity to
improve the economics for the Greenwood Project. The Company will
be conducting further evaluation, including additional sorting and
related metallurgical test work on a bulk sample, to advance the
procedure.
Meanwhile, work is progressing towards start-up
of mining operations at the Lexington mine, with mine planning and
geotechnical assessments underway to prepare for mine production.
The Greenwood Processing Plant will be wet commissioned once the
mining operation is underway. At the same time, a surface diamond
drilling program is about to kick-off on the Golden Crown property
aimed at increasing resources on the known gold zones. This program
will be expanded along a 3.5 km corridor of gold soil anomalies
into the JD area and will test new gold zones identified by chip
sampling last year. Permits are also being sought for exploration
drilling and trenching at selected areas on the Phoenix
property.
Technical disclosure in this news release has
been approved by Frank Wright, P.Eng., a Qualified Person as
defined by National Instrument 43-101, and metallurgical consultant
to the Company
For more details, please see the most recent
National Instrument 43-101 Technical Report on the Company's
website at www.goldendawnminerals.com.
On behalf of the Board of
Directors:GOLDEN DAWN MINERALS INC.Wolf Wiese,
President & Chief Executive Officer
For further information, please
contact:Corporate Communications604-221-8936
allinfo@goldendawnminerals.com
This press release was prepared by management, who take full
responsibility for its contents. Neither the TSX Venture Exchange
nor its regulation services 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 document
contains certain forward-looking statements which involve known and
unknown risks, delays, and uncertainties not under the Company’s
control which may cause actual results, performance or achievements
of the Company to be materially different from the results,
performance, or achievements implied by these forward looking
statements. We seek safe harbor.
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