Mariana Resources Ltd.: New Rhyolite Domefield Discovery With

Mariana Resources Ltd.: New Rhyolite Domefield Discovery With
Gold-Anomalous Breccias and Silver-Rich Vein-Breccias at the Los
Cisnes Project, Santa Cruz, Argentina 
VANCOUVER, BRITISH COLUMBIA -- (Marketwire) -- 11/21/12 -- Mariana
Resources Ltd. ('Mariana' or 'the Company') (TSX:MRY)(AIM:MARL), the
AIM and TSX quoted exploration and development company focused in
southern Argentina, Chile and now Peru (see News Releases 4/10/12 &
19/10/12), is pleased to announce very positive results from regional
exploration of its extensive portfolio in the eastern Deseado Massif,
Santa Cruz (Figure 1). 

--  Multiple zones of gold and silver mineralisation discovered at surface
    in an extensive 7 x 4.5km rhyolite domefield at Los Cisnes (100% owned) 
--  Total of six target areas identified within the Los Cisnes domefield,
    with initial exploration focused on the El Solar and El Brio targets 
--  The 2 x 2.5km El Solar target area includes a 300 x 600m altered
    brecciated rhyolite dome with 45 float grab samples with anomalous gold
    and silver (10 assays ranging from 0.5 to 3.4 g/t Au) 
--  Nearby vein-breccias at El Brio trend ENE-WSW for over 700m with rock
    chip samples returning up to 0.8m @ 3.0 g/t Au 3,849 g/t Ag 

Commenting today, Chairman John Horsburgh said, "These initial
results are impressive and further reflect the greenfields
prospectivity of Mariana's eastern Deseado portfolio. The discovery
of exciting new gold and silver targets over a large area at the 100%
owned Cisnes Project in the eastern portfolio has come from some
excellent project generation and perceptive follow-up work by
Mariana's Santa Cruz exploration team during the winter months. They
have successfully applied geological models derived from in-house
knowledge gained through the Las Calandrias discovery." 
Santa Cruz Regional Exploration 
A campaign of first and second pass exploration was carried out over
Mariana's extensive properties in the Eastern Deseado Massif, ranging
from Bozalito in the north to Los Cisnes in the south (Figure 1).
Approximately 30 target areas were generated by Mariana's Santa Cruz
team based on Landsat and ASTER image processing. Areas were
investigated using a combination of reconnaissance mapping and
geochemical prospecting, focusing on zones of alteration and
structures in prospective volcanic settings, particularly rhyolite
domefields. Sulphidic vein-breccias and altered brecciated rhyolites
were prospected in some detail.  
Over 400 rock chip grab samples of float and outcrop were collected
in this phase at Bozalito, Tongoril II, Bozal I-IV, Leona Dormida,
Tres Leones, Aguila/Magnolia, Canadon Pofiado I and Los Cisnes
(Figure 1). These grab samples are selective by nature and are
unlikely to represent average grades of the deposits. 
Los Cisnes Project (100% Mariana) 
At Los Cisnes, a large 4.5 x 7 km rhyolite domefield has been
discovered (twice the size of the Las Calandrias domefield), with no
signs of previous exploration.  
Post-mineralisation cover is widespread (approx. 50%) but prospective
mineralised dome breccias and related high grade vein-breccias have
been identified in float and limited outcrop. Mineralisation styles,
host rocks and possible structural controls all indicate a classic
rhyolite domefield epithermal setting, thus offering both bulk
tonnage and high grade vein-breccia potential. Six key zones of
mineralisation have already been outlined and so far at El Solar, El
Brio, Destello, El Valle, Presagio and Muro (Figure 2 & 3).  
Los Cisnes covers 9,000 Ha and is located about 75km SW of Yamana's
Cerro Moro and 120km SSE of Mariana's Las Calandrias projects. Of the
200 samples collected, 71 were strongly anomalous in gold with 27
samples returning assays over 0.5 g/t Au (maximum 11.0 g/t Au). High
silver values were also detected at the El Brio target area with 8
samples ranging from 31 g/t Ag to 716 g/t Ag, and one sample assaying
0.8m @ 3,849 g/t Ag. 
El Solar - large brecciated rhyolite dome system 
El Solar consists of a 2 x 2.5km target area with Calandrias-style
sulphidic hydrothermal breccia and vein-breccias, hosted by a
strongly altered 600 x 300m rhyolite dome with superimposed
intersecting NNW-SSE and E-W structures. Wide-spaced rock chip float
sampling returned 45 anomalous gold and silver values, 10 of which
ranged from 0.5 to 3.4 g/t Au. Significantly, mineralisation may well
extend under adjacent cover. 
El Brio & Destello - vein-breccias 
El Brio is located on the eastern border of the property, 1km SE of
El Solar, and comprises multiple sulphidic quartz-chalcedony
vein-breccias (up to 3m wide) along a 700m ENE-WSW trend, hosted by
ignimbrites.  High grade rock chips were returned along a 250m strike
with best assays of 3.0 g/t Au & 3,849 g/t Ag, 11 g/t Au & 716 g/t
Ag, 0.5 g/t Au & 666 g/t Ag and 3.2 g/t Au & 398 g/t Ag. The target
area may extend under cover along strike. 
The Destello target is a large covered area (1.25 x 0.5km) with
scattered outcrop and float of strongly oxidized breccia zones hosted
by ignimbrites. The main zone is traced over 500m, is up to 2.5 to 4m
wide and is developed along a NW-SE structural trend. A total of 13
samples returned strongly anomalous gold and silver, with a best
assay of 1.5 g/t Au. 
Work Planned  
This field season, target definition has commenced and will include
detailed mapping, channel rock chip sampling, LAG geochemical
sampling, ground magnetics and pole-dipole IP. Follow-up trenching
and drilling will be subject to the necessary permitting and access
agreements and are in process. Los Cisnes now ranks as a high
priority prospect for Mariana and vindicates the Company's focus in
the eastern Deseado Massif. 
Links: Figure 1 & 2: 
Exploration Information 
Exploration information in this announcement has been compiled by
John Horsburgh who is a Fellow of the Australasian Institute of
Mining and Metallurgy. Mr Horsburgh has sufficient experience
relevant to the style of mineralisation and types of gold deposit
under consideration and to the activity that he is undertaking to
qualify as a Competent Person as defined in the JORC Code. Mr
Horsburgh is a qualified person within the meaning of National
Instrument 43-101, Canada. 
Quality Assurance/Quality Control  
All technical information for the Company's Argentina projects is
obtained and reported under a quality assurance and quality control
(QA/QC) program. All samples are collected under the supervision of
the Company geologists and dispatched via commercial transport to
Alex Stewart ALS Chemex laboratories in Mendoza, Argentina, and
assayed in Chile. ALS Chemex's quality system complies with the
requirements for the International Standards ISO 9001:2000 and ISO
17025: 1999. Samples returning greater than 10 g/t gold and/or
greater than 100 g/t silver are assayed using gravimetric analyses.
Systematic assaying of sample duplicates and commercially prepared
standards and blanks is performed for analytical reliability. 
About Mariana Resources 
Mariana Resources Ltd is an AIM and TSX quoted exploration and
development company with an extensive portfolio of gold, silver and
copper projects in South America. In southern Argentina, the
Company's core gold-silver projects are Las Calandrias (100%), Sierra
Blanca (100%), Los Amigos JV (30%) and Aguila-Picadero (100%). These
projects are part of a 200,000+ Ha land package in the Deseado Massif
epithermal gold-silver district in mining-friendly Santa Cruz
Province. In Chile, Mariana has a joint venture with US based
international mining and natural resources company Cliffs Natural
Resources Inc., to explore for iron oxide-copper-gold deposits in a
92,000 km2 area in north-central Chile along the highly prospective
Atacama Fault Zone. In Peru, Mariana has an option to earn a 51%
interest in highly prospective copper-gold and copper-silver porphyry
targets in the Cordillera del Condor of northern Peru. 
On 19 December 2011, Mariana announced that AngloGold had completed a
strategic placement whereby AngloGold was issued 45,000,000 shares in
Mariana at a price of 12 pence per share. AngloGold has the right to
maintain its equity of 19.9% in Mariana in further issues by Mariana. 
Safe Harbour 
This press release contains "forward-looking information" within the
meaning of Canadian securities legislation ("forward-looking
statements"). These forward-looking statements are made as at the
date of this press release and include, without limitation,
statements regarding discussions of future plans, the realization,
cost, timing and extent of mineral resource estimates, estimated
future exploration expenditures, costs and timing of the development
of new deposits, success of exploration activities, permitting time
lines, and requirements for additional capital. The words "plans",
"expects", "budget", "scheduled", "estimate", "forecasts", "intend",
"anticipate", "believe", "may", "will", or similar expressions or
variations of such words are intended to identify forward-looking
statements. Forward-looking statements are subject to known and
unknown risks, uncertainties, assumptions and other factors that may
cause actual results to vary materially from those expressed or
implied by such forward-looking statements, including, but not
limited to: the effects of general economic conditions; the price of
gold and silver; misjudgments in the course of preparing
forward-looking statements; risks associated with international
operations; the need for additional financing; risks inherent in
exploration results; conclusions of economic evaluations; changes in
project parameters; currency and commodity price fluctuations; title
matters; environmental liability claims; unanticipated operational
risks; accidents, labour disputes and other risks of the mining
industry; delays in obtaining governmental approvals or in the
completion of development or construction activities; political risk;
and other risks and uncertainties described in the Company's annual
information form and MD&A for the most recently completed financial
year available on SEDAR. Although we believe that the expectations
reflected in such forward-looking statements are based upon
reasonable assumptions and have attempted to identify important
factors that could cause actual results to differ materially from
those contained in forward-looking statements, there may be other
factors that cause results not to be as anticipated, estimated or
intended. There can be no assurance that such statements will prove
to be accurate, as actual results and future events could differ
materially from those anticipated in such forward-looking statements.
Accordingly, readers are cautioned not to place undue reliance on
forward-looking statements. We do not undertake to update any
forward-looking statements, except in accordance with applicable
securities laws. 
Incorporated in Guernsey registered number 44276 
In Australia:
Mariana Resources Ltd.
John Horsburgh
+61 2 94374588 
Mariana Resources Ltd.
Glen Parsons
+61 2 94374588 
RFC Ambrian Limited (Nomad)
Rob Adamson
+61 2 9250 0041 
RFC Ambrian Limited (Nomad)
Will Souter
+61 2 9250 0050 
In U.K.:
St Brides Media and Finance Ltd (PR)
Felicity Edwards
+44 20 7236 1177 
RFC Ambrian Limited (Co UK Broker)
Klara Kaczmarek
+44 20 7634 4725 
Fox Davies Capital (Co UK Broker)
Jonathan Evans
+44 20 3463 5000 
In Canada:
Mariana Resources Ltd. (Vancouver Office)
Kathryn Witter
+1 604 669 9336
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