Coro Provides Update on Its Berta Project, Chile
November 05 2012 - 8:00AM
Marketwired
Coro Mining Corp. (TSX:COP) ("Coro" or the "Company") is pleased to
announce that it has completed preliminary metallurgical column
test work at its Berta project, located 19km W of the village of
Inca de Oro in the III Region of Chile. In addition, a NI-43-101
compliant independent resource estimate is expected to be completed
shortly.
A total of 3 representative samples were collected; a high grade
sample from a diamond drill hole; and a medium and a low grade
sample from surface trenches. The trench samples had atypically low
soluble copper ("CuS") grades due to surface weathering. The
samples were sent to Geomet S.A. metallurgical laboratories in
Santiago, Chile for compositing and test work, and subsamples taken
for mineralogical categorization were sent to Mineralogia Aplicada
a Metalurgia (M.A.M. Ltda.), also of Santiago. Four 2m columns were
completed for each sample; one at P80 -3/4" and a second at P80
-3/8", with a duplicate for each crush size.
Summary leach results for the 3/8" columns are shown on Table 1,
and leach kinetics and net acid consumption ("NAC") on Figures 1
& 2 (to view Figures 1 & 2 click on:
http://media3.marketwire.com/docs/cop115i.pdf).
Table 1: Summary leach results
----------------------------------------------------------------------------
Head assays Theoretical Actual NAC
----------- ----------- --------- ----
% % % Rec Rec
Column Sample location CuT CuS Sol CuT CuS Days kg/t
----------------------------------------------------------------------------
P80 3/8" BDH07-07 Drill core 0.84 0.59 70% 91% 130% 26 21
Comp A
----------------------------------------------------------------------------
P80 3/8" Surface trench 0.66 0.36 54% 68% 126% 28 24
Comp B (partially leached)
----------------------------------------------------------------------------
P80 3/8" " 0.38 0.14 37% 56% 150% 28 22
Comp C
----------------------------------------------------------------------------
This test work demonstrates that Berta oxide material may have
rapid heap leach recoveries in excess of theoretical percent
solubility due to the presence of significant copper wad which is
soluble in the reducing, ferrous sulphate rich conditions of the
column, but which did not report to the %CuS head assay.
Alan Stephens, President and CEO of Coro, commented, "We are
pleased the test work indicates that 100% recovery of CuS, even of
low grade material, may be achievable with approx. 15 kg/t NAC
after 15 days. Actual heap leach recoveries and residence times
would be partly a function of relative copper and acid prices. We
are very encouraged by the results of this test work, and look
forward to receiving the resource estimate shortly."
Sergio Rivera, Coro's Vice President of Exploration, a geologist
with more than 30 years of experience and a member of the Colegio
de Geologos de Chile and of the Instituto de Ingenieros de Minas de
Chile, was responsible for the design and execution of the sampling
program at Berta and is the Qualified Person for the purposes of NI
43-101. Alan Stephens, FIMMM, Coro's President and CEO, a geologist
with more than 36 years of experience, and a Qualified Person for
the purposes of NI 43-101, is responsible for the contents of this
news release.
CORO MINING CORP.
Alan Stephens, President and CEO
About Coro Mining Corp.:
The Company was founded with the goal of building a mining
company focused on medium-sized base and precious metals deposits
in Latin America. The Company intends to achieve this through the
exploration for, and acquisition of, projects that can be developed
and placed into production. Coro's properties include the advanced
San Jorge copper-gold project, in Argentina, and the Berta, El
Desesperado, Payen, El Inca, Chacay, Llancahue, and Celeste copper
properties located in Chile.
For further information please visit the Company's website at
www.coromining.com.
This news release includes certain "forward-looking statements"
under applicable Canadian securities legislation. Such
forward-looking statements or information, including but not
limited to those with respect to metallurgical recoveries involve
known and unknown risks, uncertainties, and other factors which may
cause the actual results, performance or achievements of the
Company to be materially different from any future results,
performance or achievements expressed or implied by such
forward-looking statements or information. Such factors include,
among others, the actual prices of copper, the factual results of
current exploration, development and mining activities, changes in
project parameters as plans continue to be evaluated, as well as
those factors disclosed in the Company's documents filed from time
to time with the securities regulators in the Provinces of British
Columbia, Alberta, Saskatchewan, Manitoba, Ontario, New Brunswick,
Nova Scotia, Prince Edward Island and Newfoundland and
Labrador.
Contacts: Coro Mining Corp. Michael Philpot Executive
Vice-President (604) 682 5546investor.info@coromining.com
www.coromining.com
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