27 August 2008
AIM / PLUS Markets: AAU
METALLURGICAL RESULTS: TAVSAN
Ariana Resources plc ("Ariana" or "the Company"), the gold
exploration and development company focused on Turkey, is pleased to
announce that the results of metallurgical testwork conducted on
material from the Tavsan Gold Prospect demonstrate that the ore
performs very well under heap-leach conditions. These data will be
used as part of a broader scoping study scheduled for later this
year.
Highlights:
* Mineralisation is amenable to the heap-leach processing option
* Bottle-roll tests yielded gold extraction levels of up to 88%
* Column-leach testwork yielded gold extraction levels of up to 80%
Dr. Kerim Sener, Managing Director, commented:
"The results of these initial and follow-up metallurgical results are
very encouraging and point toward the amenability of the ore to the
heap-leach method of processing. We are now evaluating strategies
for the development of the deposit within the shortest possible
timeframe.
"Preparations are underway for further resource definition drilling
to expand the original resource estimate of some 140,000 ounces. Our
aim is to increase and refine the resource to a potentially economic
minimum threshold."
Contacts:
Ariana Resources plc Tel: 020 7407 3616
Michael Spriggs, Chairman
Kerim Sener, Managing Director
Beaumont Cornish Limited Tel: 020 7628 3396
Roland Cornish
Lothbury Financial Tel: 020 7011 9411
Michael Padley / Louise Davis
Loeb Aron & Company Ltd Tel: 020 7628 1128
Peter Freeman / Frank Lucas
Alexander David Securities Limited Tel: 020 7448 9820
Nick Bealer / David Scott
Testwork Summary
Metallurgical testwork was undertaken on two composite samples of
mineralised material sent to the SGS Lakefield laboratory in Canada.
The purpose of the testwork was to determine, via several simulation
tests, the amenability of the Tavsan 'ore' to heap-leach processing,
which is commonly the only metallurgical route acceptable for
low-grade gold deposits.
The samples selected for testwork were collected from drill-chippings
from the Main Zone of the Tavsan prospect and represent high- and
average-grade mineralisation types (Table 1). The gold grades of
these two composite samples are within the range of grades determined
by the 43-101 compliant mineral resource estimate announced by the
previous operator. Both samples showed very low total sulphide in
the range of 0.06-0.10% S and low base metal concentrations. The
high-grade composite sample contained 1.10% Sb, due to the occurrence
of visible stibnite and stibiconite in parts of the deposit. In
contrast, the average grade composite contained 0.09% Sb.
Coarse bottle-roll tests at minus ¿ inch and minus 10 mesh particle
size were performed to determine the amenability of the samples to
heap-leaching (Table 1). The simulation tests at minus ¿ inch mesh
resulted in gold recoveries of 75% to 88% and silver recoveries of up
to 28% to 37% over a period of 14 days. The gold content of the
residues from tests conducted on the minus ¿ inch mesh material
ranged from 0.17 g/t Au to 1.07 g/t Au for the average- and
high-grade samples respectively. The recovery of gold from the minus
10 mesh material was not dissimilar to that at minus ¿ inch mesh and
hence the coarser minus ¿ inch material was chosen for the
column-leach testwork.
Column-leach tests at minus ¿ inch were performed to provide a better
proxy for the heap-leach processing route (Table 1). The tests
resulted in gold recoveries of 67% to 80% and silver recoveries of up
to 22% to 26% over a period of 77 days. The gold content of the
residues ranged from 0.26 g/t Au to 1.33 g/t Au for the average- and
high-grade samples respectively. The relatively low silver
recoveries are not considered problematic as the silver grades in the
resource are low and add little value to the deposit. The average
grade ore, approximately 1.3 g/t Au, responds most efficiently to the
heap-leach processing method possibly due to the lower antimony
content of this material. The consumption of reagents in solution
was moderate.
SGS Lakefield concluded:
"These ores responded well to the column simulated heap-leaching
process."
Table 1: Summary of results of the metallurgical testwork on Tavsan
mineralisation.
+--------------------------------------------------------------------------------------------+
| | Heap-leach | Heap-leach | Column-leach |
| | Simulation1 | Simulation2 | Testwork3 |
|--------------------------+---------------------+---------------------+---------------------|
| | Gold | Silver | Au | Ag | Au | Ag | Au | Ag |
| Sample | (g/t) | (g/t) | Recovery | Recovery | Recovery | Recovery | Recovery | Recovery |
| | | | (%) | (%) | (%) | (%) | (%) | (%) |
|---------+-------+--------+----------+----------+----------+----------+----------+----------|
| Average | 1.29 | 4.70 | 83.8 | 39.0 | 87.7 | 37.0 | 79.5 | 25.9 |
| Grade | | | | | | | | |
|---------+-------+--------+----------+----------+----------+----------+----------+----------|
| High | 4.02 | 3.90 | 78.5 | 36.2 | 75.1 | 27.8 | 67.4 | 21.5 |
| Grade | | | | | | | | |
+--------------------------------------------------------------------------------------------+
1) Heap-leach simulation (coarse bottle-roll tests) on minus 10 mesh
material over 14 days.
2) Heap-leach simulation (coarse bottle-roll tests) on minus ¿ inch
mesh material over 14 days.
3) Column-leach testwork results for minus ¿ inch mesh material over
77 days.
Editors' note:
Dr Kerim Sener, BSc (Hons), MSc, PhD, is the Managing Director of
Ariana Resources plc. A graduate of the University of Southampton in
Geology, he also holds a Master's degree from the Royal School of
Mines (Imperial College, London) in Mineral Exploration and a
doctorate from the University of Western Australia. He is a Fellow
of The Geological Society of London and has worked in geological
research and mineral consultancy in Southern Africa and Australia.
He has read and approved the technical disclosure in this regulatory
announcement.
About Ariana Resources
Ariana is an exploration and development company focused on
epithermal gold-silver and porphyry copper-gold deposits in Turkey.
The Company is exploring a portfolio of prospective licences selected
on the basis of its in-house geological and remote-sensing database,
on its own in western Turkey and in Joint Venture with European
Goldfields Limited in north-eastern Turkey.
The Company's flagship assets are its Sindirgi and Tavsan gold
projects. Both projects contain a series of prospects, within two
prolific mineralised districts in the Western Anatolian Volcanic and
Extensional (WAVE) Province in western Turkey. This Province hosts
the largest operating gold mines in Turkey and remains highly
prospective for new porphyry and epithermal deposits. These core
projects, which are separated by a distance of 75km, are presently
being assessed as to their economic merits.
Loeb Aron & Company Ltd. and Alexander David Securities Limited are
joint brokers to the Company and Beaumont Cornish Limited is the
Company's Nominated Adviser.
For further information on Ariana you are invited to visit the
Company's website at www.arianaresources.com.
Ends
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