VANCOUVER, Feb. 23, 2012 /CNW/ - Curis Resources Ltd. (TSX: CUV)
("Curis" or the "Company") announces preliminary results for laboratory
test work performed on metallurgical samples obtained from the summer
2011 drilling program at the Florence Copper property in Arizona.
Metallurgical testing to confirm and improve on historical copper
recovery estimates began in June 2011 at Metcon Research ("Metcon") of
Tucson, Arizona. Bottle roll testing has been completed on 16 initial
samples from the 2011 drilling; the results compare favorably to work
completed by BHP Copper ("BHP") in the mid 1990s, as summarized in
Curis' September 2010 Preliminary Economic Assessment ("PEA"). Results
for the bottle roll tests as well as the four completed laboratory
scale in-situ copper recovery (ISR) tests are summarized below. The
remaining 12 In-Situ Recovery ("ISR") tests are on-going with
completion expected in Q2 of 2012.
"We are very pleased with the preliminary results from our extensive
metallurgical test program which is being overseen by Dr. Terry McNulty. of T. P. McNulty and Associates, Inc. and Dr. Dave Dixon of the
University of British Columbia," stated Dan Johnson, Curis' VP Environment and Technical Services. "The results of these tests indicate that there are significant
opportunities to improve on historical estimates of copper recovery at
Florence Copper and, ultimately, the overall positive economics of this
Bottle Roll Test Overview
Curis delivered sections of core from four drill holes to Metcon. These
holes were part of a larger six-hole program drilled in summer 2011 as
described in news releases dated August 16 and October 13, 2011.
Sections of the core were then selected to make up 16 samples, four
samples from each of the four drill holes. Total copper contained in
head samples analyzed by Metcon ranged from 0.19 percent to 0.77
percent, with an average of 0.42 percent copper. Samples were also
submitted for mineralogical characterization at Montana Tech of the
University of Montana in Butte, Montana, which confirmed chrysocolla as
the dominant copper mineral, consistent with the PEA results. However,
other non-sulfide copper species are also present.
A total of 16 bottle roll tests were each run for 72 hours while
maintaining constant acid concentrations. On average, the acid-soluble
copper ("AS Cu") head grades represented 68 percent of the total copper
present, versus the 67 percent assumed in the 6-year recovery model
used for the PEA. At the nominal concentration of 10 grams/liter (g/l)
sulfuric acid for extraction testing purposes, the average AS Cu
extraction was 90 percent versus the 86 percent extraction that was
assumed in the PEA and in BHP's prefeasibility study.
In-Situ Recovery Overview
The goal of the on-going ISR test program is to represent a mineralized
block cross-section, and simulate in-situ treatment of the Florence
Copper mineralized resource by allowing recovery solutions to flow
horizontally through intact pieces of drill core using a specially
designed laboratory apparatus. Historical in-situ laboratory
simulations relied on columns that simulated vertical flow rather than
horizontal flow and also did not keep the core intact without the use
of stabilizing agents. The current program is believed to be much more
representative of actual in ground conditions expected at Florence.
"I believe that the ISR simulation protocol that has been developed by
Curis and Metcon staff is the most realistic approach that has been
taken to resolving this difficult technical challenge", stated Terry McNulty, TP McNulty and Associates. "The tests have proceeded smoothly and I feel very positive about the
physical conditions of the leached core, the leaching kinetics, and the
percentage of copper that dissolved during the leaching."
ISR test results are given in Table 1. A graph of recovery over time is
posted in the news release on the Company's website at www.curisresources.com. To date, four of 16 ISR tests have been completed with copper
extraction ranging from 45 percent to 81 percent as compared to a
recovery of 49 percent reported in the PEA. Of these, the tests run
using 5 g/l sulfuric acid solution averaged 46 percent copper recovery
while the tests run at 10 g/l sulfuric acid averaged 71 percent copper
Table 1: ISR Laboratory Test Results
A report on the metallurgical test program that includes additional
details and photographs is also posted with the release on the website
The metallurgical test program is being supervised by Dr. Terry McNulty,
P.E., of T. P. McNulty and Associates, Inc. of Tucson, Arizona who is a
Qualified Person as defined by NI43-101 and has reviewed this
Curis Resources Ltd. is a mineral development company associated with
Hunter Dickinson Inc., a diversified global mining company with a
25-year history of mineral development success. Curis is focused on the
acquisition, development and operation of high-quality next-generation
copper properties in progressive jurisdictions around the world. It is
currently focused on advancing its 100% owned Florence Project in
Arizona USA to production.
For more information about Florence Copper and its projected economic
impacts and benefits to the local community, please go to www.florencecopper.com.
For more project-level information, sign up to receive News and Updates from the Florence Copper project.
For further details on the Company, please visit www.curisresources.com or contact Susie Bell, Manager of Investor Relations, at (604) 684-6365
or within North America at 1-800-667-2114.
President & CEO
No regulatory authority has approved or disapproved of the information
contained in this news release.
This release includes certain statements that may be deemed
"forward-looking statements". All statements in this release, other
than statements of historical facts, that address exploration drilling,
exploitation activities and events or developments that the company
expects are forward-looking statements. Although the Company believes
the expectations expressed in such forward-looking statements are based
on reasonable assumptions, such statements are not guarantees of future
performance and actual results or developments may differ materially
from those in the forward-looking statements. Factors that could cause
actual results to differ materially from those in forward-looking
statements include fluctuations in market prices, exploitation and
exploration successes, continuity of mineralization, uncertainties
related to the ability to obtain necessary environmental, land use and
other permits, approvals, licenses and title on a timely basis and
delays due to third party opposition, changes in government policies
regarding mining and natural resource exploration and exploitation,
continued availability of capital and financing, and general economic,
market or business conditions. Investors are cautioned that any such
statements are not guarantees of future performance and actual results
or developments may differ materially from those projected in the
forward-looking statements. For more information on the Company,
investors should review the Company's continuous disclosure filings
that are available at www.sedar.com.
SOURCE Curis Resources Ltd.
For further information:
Manager, Investor Relations