ABN 52 007 626 575
20 January, 2012
The Manager
Company Announcements Office
Australian Securities Exchange Limited
Level 4, Stock Exchange Centre,
20 Bridge Street
Sydney, NSW, 2000
Dear Sir,
News Release - Nyngan Project NSW - Final Report on Pilot Plant test-work
The Company's joint venture partner and 'manager' for the Nyngan Scandium Project, EMC Metals Corp., reported a second "News Release" on January 19th in Canada. Shareholders are advised that National Instrument 43 - 101 referred to in the release is the Canadian equivalent of the Australian J.O.R.C. code.
The project progresses satisfactorily as evidenced by News Releases on successive days..
By order of the Board
Duncan Pursell
Managing Director
The information in this report that relates to Exploration Results or Mineral Resources is based on information compiled by D.C. Pursell (MAusIMM) and Mr D. Foster, (MAusIMM). D.C. Pursell and D. Foster have sufficient experience which is relevant to
the style of mineralisation and type of deposit under consideration and to the activity which they are undertaking to qualify as Competent Persons as defined in the 2004 Edition of the 'Australasian Code for Reporting of Exploration Results, Mineral Resources and Ore Reserves'. D.C. Pursell and D. Foster consent to the inclusion.
Suite 12, 10 JAMIESON STREET, CHELTENHAM, VICTORIA 3192
Telephone: (03) 9583 0498 Facsimile: (03) 9583 0698 Email: admin@jervoismining.com.au
NEWS RELEASEEMC Receives Final Report on Pilot Plant Test-Work for
Nyngan Scandium JV Project in NSW, Australia
Reno, Nevada - January 19, 2012 - EMC Metals Corp. (the "Company" or "EMC") (TSX: EMC) is pleased to announce that it has received an independent metallurgical test-work report, titled "Purification of Scandium Extracted from Laterite Ore" (the "Report"), outlining the results of a number of pilot-scale tests on Nyngan resource material, and estimated recoveries and grades of scandium oxide product. The Report, commissioned by EMC, was independently prepared by Hazen Research, Inc., of Golden, Colorado, USA ("Hazen"), and is the final in a series of three phases of semi-continuous pilot plant scale test-work completed by Hazen during 2011, finalized in late November.Pursuant to an agreement with Jervois Mining Limited ("Jervois") (ASX: JRV), EMC has the right to earn a 50% joint venture interest on the Nyngan Scandium Project, located in New South W ales, Australia.
Highlights of the 2011 Hazen semi-continuous pilot plant test-work are as follows:
• Results of conventional contained sulfuric acid bake and
water leach systems, at atmospheric pressure, demonstrated
scandium recoveries averaging 75%,
• Results of conventional solvent extraction ("SX") on the
pregnant leach solution, demonstrated scandium recoveries
exceeding 99%,
• Results on final stage precipitation of scandium oxide,
focussed on highest combined purity and recovery,
demonstrated scandium recoveries of 97.5%, at purity levels
of
• Overall recovery results were 70% to 80%, based on ore type
(limonite or saprolite), and
• All process assumptions were based on standard and accepted
techniques for ore preparation, leaching, solvent extraction
and final product preparation.
Tel: (775) 355-9500 Fax: (775) 355-9506 Email: info@emcmetals.com www.emcmetals.com
The table below presents the detail of the various stages of process results, recoveries and grades:
Batch and Continuous Pilot Plant Results - Nyngan Scandium Project | ||||
Total Wei ght Processed | Ave Ore Grade | |||
Test Batch Details | 1,112 kg | 0.0317% | ||
Process Step | Test Campaign - Detail | Scandium Recovery | Scandium Grade | Scandium Form |
Acid Baking | 150 hours - continuous | |||
Water Leaching | 6 discontinuous campaigns | 72% -83%* | ~60 ppm | solution |
Solvent Extraction (8 stages) | 1 continuous campaign (13 days) | 99.0% | <2,200 ppm | solution |
Scandium Precipitation | ||||
Single Stage | 3 batch precipitations | 97.5%** | 97.5% | oxide |
Two Stage | 2 batch precipitations | 40%** | 99.5% | oxide |
Overall Result | 70% - 80%* | 97.5% | oxide | |
NOTES: | ||||
* Depending on ore type | ||||
** No recycle of tail solution |
The Hazen semi-continuous pilot plant test-work program for
Nyngan resource processing was based on two previous
metallurgical testing programs, specifically
1. Results from work done by the CSIRO (Melbourne, Australia)
in 2008-2010 and tests done at
METCON Laboratories (Sydney, Australia) from 2006 to 2010,
completed for our partner
Jervois Mining Limited (Melbourne, Australia - ASX:JRV),
and
2. Results from bench-scale test work previously done by
Hazen in 2010 -2011.
Most of this work focused on acid bake and leaching
techniques, along with conventional solvent extraction
techniques. Very little work was done on production
techniques for final precipitation and finish of scandium
oxide. The overall recovery results from this various
baseline, bench scale work was not appreciably different,
although a great deal was learned over the period about the
process refinements required to arrive at the best results,
specifically grade and recovery trade-offs that come from
different techniques and parameters.
The Hazen semi-continuous pilot plant work was commissioned
in Q1 2011, and was intended to demonstrate the viability of
the assorted bench scale work and results at larger scale, to
better understand and improve on those lab results, to
confirm equipment configurations for plant design, and to
complete the understanding on the final precipitation step to
product grade material, as to grade and recoveries.
Page | 2
The resource material utilized in the Hazen program was
sourced from Nyngan project Aircore and Reverse Circulation
("RC") drill holes, and included separate saprolite (371 kg)
and limonite (741 kg) material samples, bagged at the time of
drilling, identified, and preserved for future project
test-work programs.
EMC has previously publically indicated a target overall
recovery for scandium of 80%. That overall recovery level was
achieved in Nyngan's saprolite material, but not in the
limonite material. Achieved recoveries, weighted for scandium
content differences in the various materials, was +72%. These
recoveries do not reflect any number of secondary recovery
techniques for the residue material (+100 ppm Sc) or the
scandium remaining in the SX and precipitation
circuits---these are single pass results. Additional work
with other research and process development groups suggests
secondary recoveries in each area could be significant,
particularly for the acid bake residue material. Preliminary
bench scale results with other groups indicate that over 60%
of the scandium retained in the acid bake tails can be
dissolved during subsequent processing, taking the overall
recovery figure to over 90%.
Further work is anticipated in this area and will be reported
later, recognizing second-pass recovery improvement options
always remain dependent on primary resource economics.
The Company is currently working with SNC-Lavalin Inc.
(Brisbane, Australia) to complete a National Instrument NI
43-101 Technical Report on the economics of the Nyngan
Scandium Project, scheduled for completion in late February
2012. These 2011 Hazen metallurgical test-work program
results, together with previous test-work by the CSIRO and
METCON Laboratories, will be used directly by SNC-Lavalin in
that Technical Report, to support process design, costing,
and production level assumptions.
"These pilot-scale metallurgical test results from Hazen confirm for us the previous collective work on the Nyngan resource, and provide the foundation for SNC-Lavalin to complete the detailed process design and economic validation for the Nyngan Scandium Project. We believe these results to be fully supportive to our JV project with our partner, Jervois Mining, and keep us on track to complete the SNC-Lavalin work on schedule."
Mr. Willem Duyvesteyn, CTO of EMC commented:"The work carried out by Hazen Research is gratifying in that it suggests good performance, on a large scale, from a series of standard processes. The complexity always lies in the detailed management of the processes, and we have now had a chance to understand the sensitivities and find some optimization, at a much larger scale than previous work allowed. There is more process refinement to pursue, and more to gain in our view, but we now have a solid base from which to develop the project."
Page | 3
Some further Hazen metallurgical test-work program
specifics:
I. Acid Bake & Leach. Hazen prepared five batches of pugged
resource material, performed
78 batch bakes with a small rotary kiln over a total 150
hours, applied several different filtration techniques to the
leachate material and produced;
• a quantity of 1,956 kg of blended primary filtrate,
• grading 60 ppm scandium in solution, and
• 72-83% recoveries
II. Solvent Extraction. Early laboratory scale work on SX by
the CSIRO has guided the construction of a pilot SX circuit
at Hazen's facility, consisting of three countercurrent
extraction and three stripping stages, where various
extractants of differing effectiveness and temperature
control systems were tested, under various operating
conditions. The test-work produced:
• a strip product grading 890 ppm scandium,
• at +99% recoveries.
Considerably higher intermediate grades were made with
different extractants, but with
somewhat lower recoveries.
III. Precipitation and Finish. Techniques focused on separate
techniques to achieve marketable purity product at highest
possible recovery levels, or very high purity product at
lower anticipated recovery levels. The work demonstrated
that:
• marketable scandium oxide grades can be achieved with
single stage recovery techniques and high recovery levels,
and
• two stage techniques will produce very high grade product,
at lower recoveries.
These recoveries are based on single pass measurement that
did not consider system loading
and ultimate continuous operational recoveries, which would
likely be materially higher for two stage systems.
EMC's high-priority development opportunity is the Nyngan
Scandium joint venture with Jervois Mining Limited of
Melbourne, Australia. The Nyngan Scandium Project has a
National Instrument ("NI") 43-101 measured and indicated
resource estimate of 12 million tonnes, grading 261 ppm Sc,
based on a cut-off grade of 100 ppm Sc ("NI 43-101 Technical
Report on Nyngan Scandium, Jervois Mining Limited, Nyngan,
New South Wales, Australia", March 25, 2010).
The technical information in this news release has been
reviewed by W illem Duyvesteyn, a Qualified
Person as defined by National Instrument 43-101. Mr.
Duyvesteyn is employed by EMC Metals Corp.
Page | 4
distribué par | Ce noodl a été diffusé par Jervois Mining Limited et initialement mise en ligne sur le site http://www.jervoismining.com.au. La version originale est disponible ici. Ce noodl a été distribué par noodls dans son format d'origine et sans modification sur 2012-01-20 09:34:21 AM et restera accessible depuis ce lien permanent. Cette annonce est protégée par les règles du droit d'auteur et toute autre loi applicable, et son propriétaire est seul responsable de sa véracité et de son originalité. |
Documents associés | |
Nyngan Project NSW |