AIM and PLUS code: MARL 2 June 2010 Mariana Extends Calandria Sur Gold Mineralisation to Northwest, Las Calandrias Project, Southern Argentina Mariana Resources Ltd (Mariana or the Company), the AIM quoted exploration and development company focussed in Argentina and Chile, announces further wide gold intersections from the latest 19 drill holes at the Calandria Sur prospect (Calandria Sur) at its Las Calandrias gold project (Las Calandrias), located in the prospective Deseado Massif gold district in southern Argentina. The scope to expand the Las Calandrias project is enhanced by the Calandria Sur bulk tonnage potential, the recent Calandria Norte bonanza gold intersections and additional targets at El Nido. Overview * Best intersections from this second batch of 19 drill holes at Calandria Sur include: * Hole CSD24 - 102m @ 1.4 g/t gold (Au) and 21 g/t silver (Ag) from 12.5m, incl.

32 m @ 2.9 g/t Au and 42 g/t Ag from 77m * Hole CSD25 - 68m @ 2.4 g/t Au and 24 g/t Ag from 74m, incl.

5m @ 10.3 g/t Au and 76 g/t Ag from 99m * Hole CSD39 - 106m @ 1.6 g/t Au and 27 g/t Ag from 3m, incl.

12m @ 2.5 g/t Au and 89 g/t Ag from 59m � Broad intercepts of over 1 g/t Au now extend over a 400m x 200m zone and indicate bulk tonnage potential � The untested 280m x 130m western sector of the rhyolite dome at Calandria Sur is highly prospective for additional gold mineralisation � Follow-up drilling is planned at Calandria Sur to form the basis of an initial resource study � A programme of preliminary metallurgical test work at Calandria Sur is to get underway to determine overall recoveries - expected to take approximately three months Mariana Managing Director John Sutcliffe said, "These impressive results from Calandria Sur, in conjunction with the recently announced Calandria Norte bonanza gold intercepts, continue to highlight Las Calandrias exciting upside as it becomes clear that it contains multiple mineralised zones with both bonanza and bulk tonnage potential.

At Calandria Sur, gold and silver mineralisation continues to the northwest of the previously released drill holes and now extends for approximately 400m, over a width of 150-200m and to depths exceeding 100m.

Looking ahead, additional drilling in the western sector and other targeted areas at Calandria Sur will form the basis of an initial resource study, which will further define the economic potential of the project." The 2010 diamond drill programme at Las Calandrias consisted of 4,400m in 37 holes and tested four main targets: Calandria Sur (28 holes/3,212m); Calandria Norte (2 holes/299m), El Nido Este (2 holes/309m) and Nido Norte (5 holes/580m). Calandria Sur A total of 4,095 m in 36 diamond holes has been drilled since September 2009.

Results demonstrate a robust mineralised system emplaced within the core of the Calandria Sur rhyolite dome.

The drilling indicates bulk-tonnage potential gold within the main body of the boat-shaped dome, 400m long (from hole CSD12, 51m @ 0.6 g/t Au to hole CSD35, 16m @ 1.3 g/t Au) by at least 150-200m wide (from hole CSD39, 106m @ 1.6 g/t Au to CSD38, 42m @ 0.8 g/t Au).

The mineralisation is open southwest of the dome core at Calandria Sur and further drilling is planned to test an area of 380m by 130m.

The top of the mineralised zone is mostly within 50m of the surface.

The gold-silver mineralisation is associated with disseminations, veinlets and stockworks of marcasite and pyrite hosted by hydrothermally brecciated and silicified rhyolite. At the southern end of the dome, mineralisation appears to be characterised by low to irregular gold grades in holes CSD09,10 and 14.

Holes collared on the northwest dome margin (CSD28, 29, 30 and 31) did not return significant results and define the northern extent of the mineralisation. Results from the additional 19 drill holes at Calandria Sur (see Table 1) include: * 102m @ 1.4 g/t g Au and 21 g/t Ag from 12.5m, incl.

32m @ 2.9 g/t Au and 42 g/t Ag from 77m - CSD24 * 68m @ 2.4 g/t Au and 24 g/t Ag from 74m, incl.

5m @ 10.3 g/t Au & 76 g/t Ag from 99m & 1m @ 40.2 g/t Au & 85 g/t Ag from 105m - CSD25 * 31m @ 1.4 g/t Au and 7 g/t Ag from 54m - CSD26 * 93.5m @ 0.9 g/t Au and 23 g/t Ag from 4.5m, incl.

20m @ 1.6 g/t Au & 42 g/t Ag from 69m - CSD27 * 82.5m @ 1.1 g/t Au and 34 g/t Ag from 16.5m, incl.

16 m @ 2.3 g/t Au and 100 g/t Ag from 63m - CSD36 * 120.5m @ 0.9 g/t Au and 17 g/t Ag from 3.5m - CSD37 * 106 m @ 1.6 g/t Au and 27 g/t Ag from 3m, incl.

12 m @ 2.5 g/t Au and 89 g/t Ag from 59m - CSD39 * 85m @ 0.9 g/t Au and 34 g/t Ag from 31m- CSD40 The location of these new drill holes in relation to previously released results is shown on the drill plan (Figure 2), together with an outline of gold mineralisation greater then 20gm.metres (aggregate intersection length for each hole in metres x average grade in g/t Au).

Holes are located 50m apart on an E-W or NE-SW sections (see Figures 3-5).

Results of CSD43 and 44 are awaited. Nido Este Hole NED48, one of two holes drilled at Nido Este, located 1.1 km northwest of Calandria Sur, did not return significant gold and silver values.

The two holes were collared 100m apart to test a 3D IP anomaly.

Both intersected wide zones of sulphide (pyrite-marcasite) as disseminations and veinlets in a rhyolite dome.

Intercepts ranged from 70m to 120m down-hole, with high sulphide zones ranging from 6 to 27m.

Results for the other hole are pending. Nido Norte The first hole in Nido Norte (NND49), located two kilometres northwest of Calandria Sur, intersected a 4m wide silicified and sulphide-rich structure within a 30m zone of sulphidic quartz veins stockwork and breccias beneath a zone of oxidation from 5m to 26m.

A 14.4m interval assayed 0.3 g/t Au.

Assays of two additional holes drilled on section are awaited. Calandria Norte Two scout holes 70m apart testing the core of an IP anomaly along a 450m vein-breccia trend intersected bonanza gold-silver with 5.0m @ 81.1 g/t Au and 76 g/t Ag (including 1.0m @ 348 g/t Au and 312 g/t Ag) in CND45 and 4.5m @ 98 g/t Au and 72 g/t Ag (including 0.75m @ 443 g/t Au and 307 g/t Ag) in CND46 (see News Release 26/5/2010). Work Planned Further drilling of the western sector and other selected parts of the Calandria Sur dome is required to complete the first phase coverage and will form the basis of an initial resource study.

An independent consultant will prepare the resource estimate to a standard compliant with the Canadian National Instrument 43-101 (NI 43-101). In parallel with this, a programme of preliminary metallurgical test work will commence using Metcon Laboratories in Australia under the supervision of consulting metallurgist Peter Lewis, starting with classification of mineralisation types from which to select appropriate representative samples.

A characterisation study based on a composite sample from two of the 2009 intersections has indicated that the gold is mostly associated with marcasite and pyrite.

The test work will investigate various treatment scenarios to determine overall recoveries for the various types of mineralisation.

This work is expected to be completed in August 2010 and together with the resource study will assist in defining economic potential. The recent bonanza gold discovery at Calandria Norte has emerged as a high priority target with follow-up drilling being planned. Exploration of the rest of the prospective rhyolite domefield at Las Calandrias will also be fast-tracked with extensive 3D Induced Polarisation and ground magnetic surveys scheduled. Corporate Ongoing funding of Marianas work programme is a priority and currently the intention is to look at the possibility of a dual listing on an appropriate exchange. Table 1: Calandria Sur Target Drill Hole Summary CALANDRIA SUR
HOLE PARAMETERS INTERCEPT HOLE UTME UTMN ALT AZ DIP DEPTH FROM TO CORE LENGTH GOLD SILVER (masl) (�) (-�) (m) (m) (m) (m) (g/t) (g/t) CSD08* 613709 4724881 166 340 55 90.7 32.6 42.3 9.7 0.4 NSV
CSD09* 613962 4724313 167 85 50 117.4 22.5 77.3 54.8 0.8 10 Inc
67.3 75.3 8.0 1.9 13 CSD10* 613906 4724364 178 85 50 107.3 38.9 99.9 61 0.2 4 Inc
38.9 44.9 6 1.1 10 CSD11* 613980 4724490 168 295 50 126.5 No significant intercept- hole remains in the volcaniclastic CSD12* 613887 4724425 176 90 60 94.8 19.3 24.85 5.6 1.9 25 CSD12
36.4 88.5 51.1 0.6 5 Inc
75 85.5 10.5 1.2 11 CSD13* 613836 4724512 178 85 50 112.8 7.0 109.0 102.0 1.2 17 Inc
89 109 20.0 2.6 39 CSD14* 613880 4724366 176 95 75 127.8 92 121.1 29.1 0.3 1 CSD15* 613832 4724577 179 20 60 96.8 3.5 95 91.5 1.6 17 Inc
49 70 21 4.5 39 Inc
51 53 2 28.4 154 CSD16* 613790 4724587 179 20 60 97.0 23 94 71 1.1 23 Inc
61 90 29 1.8 35 CSD17 613788 4724515 176 90 60 152.2 7 31 24 0.5 4 CSD17
83 147.5 64.5 1.1 20 Inc
90 113.6 23.55 2.0 40 CSD18 613827 4724470 176 75 50 137.5 67.5 131.0 63.5 1.2 20 Inc
91.5 119 27.5 2.2 34 CSD19 613838 4724542 179 70 65 109.6 40 103 63 0.6 11 Inc
89 100 11 1.0 6 CSD20 613888 4724510 179 90 50 77.5 39 77.5 38.5 1.7 13 Inc
40 45 5 7.2 14 And
64 65 1 12.1 164 CSD21 613747 4724505 175 90 75 158.0 2 111.5 109.5 0.8 19 CSD21
33 97 64 1.2 29 Inc
51 70 19 2.2 43 CSD22 613806 4724429 172 80 60 115.5 4.5 99 94.5 0.7 11 CSD22
4.5 39 34.5 1.3 20 Inc
7.5 18 10.5 2.3 12 CSD23 613821 4724533 178 20 70 131.5 47 116.5 69.5 2.1 39 Inc
81 103 22 4.4 79 CSD24 613779 4724536 179 15 70 119.0 12.5 114.5 102 1.4 21 Inc
77 109 32 2.9 42 CSD25 613757 4724455 170 75 50 143.0 74 142 68 2.4 24 inc
99 104 5 10.3 76 And
115 116 1 40.2 85 CSD26 613763 4724643 182 20 70 86.5 9 29 20 0.3 18 CSD26
54 85 31 1.4 7 Inc
54 55 1 9.6 20 CSD27 613730 4724574 177 10 70 113.5 4.5 98 93.5 0.9 23 Inc
69 89 20 1.6 42 CSD28 613734 4724689 184 15 70 92.5 No significant intercept CSD29 613487 4724697 171 280 70 71.5 No significant intercept CSD30 613491 4724702 171 350 70 81.5 No significant intercept CSD31 613563 4724690 171 10 70 86.5 No significant intercept CSD32 613616 4724686 178 10 70 116.0 31 101.5 70.5 0.5 22 Inc
49 64 15 1.0 41 CSD33 613675 4724677 183 15 70 116.3 43 72 29 0.4 23 And
92 107.5 15.5 0.5 6 CSD34 613524 4724707 170 10 70 85.5 36 42 6 0.5 65 CSD35 613611 4724630 175 10 70 107.5 42 48 6 0.8 14 And
70 86 16 1.3 27 CSD36 613657 4724620 179 10 70 127.0 16.5 99 82.5 1.1 34 Inc
62 78 16 2.3 100 CSD37 613664 4724568 179 20 70 131.0 3.5 124 120.5 0.9 17 Inc
6.5 40 33.5 1.2 26 And
99 100 1 14.8 58 CSD38 613646 4724523 177 20 70 119.0 32 74 42 0.8 31 CSD39 613704 4724616 179 20 70 113.0 3 109 106 1.6 27 Inc
59 71 12 2.5 89 CSD40 613735 4724534 174 20 70 125.0 31 116 85 0.9 24 CSD41 613869 4724441 176 75 80 116.0 78 92.5 14.5 0.6 5 CSD42 613885 4724382 177 260 60 139.8 52 56 4 2.1 32 CSD42
69 115.5 46.5 0.4 4 CSD43 613877 4724331 174 260 60 160.3 Assay Pending
CSD44 613758 4724804 174 30 65 80.0 Assay Pending
*2009 Drill campaign NB Intervals are weighted averages with 3m maximum < 0.2 g/t Au within the intervals. **ENDS** For further information please visit website at www.marianaresources.com or contact the following. John Horsburgh (Chairman) Mariana Resources Ltd +61 2 94374588 John Sutcliffe (MD) Mariana Resources Ltd +593 99 808080 Rob Adamson RFC Corporate Finance Limited (Nomad) +61 2 9250 0041 Will Souter RFC Corporate Finance Limited (Nomad) +61 2 9250 0050 Joe Lunn (Analyst) FinnCap (Broker) +44 20 7600 1658 Matthew Robinson FinnCap (Broker) +44 20 7600 1658 Felicity Edwards St Brides Media and Finance Ltd (PR) +44 20 7236 1177 Hugo de Salis St Brides Media and Finance Ltd (PR) +44 20 7236 1177
About Mariana Resources Mariana Resources Ltd is an AIM quoted exploration and development company with an extensive portfolio of gold, silver and copper projects in Argentina and Chile.

In Argentina, in addition to the Las Calandrias gold-silver discovery project, the Company owns the Sierra Blanca silver prospect and has a joint venture with Hochschild Mining.

Mariana also owns exclusive exploration rights to a 160,000 Ha area.

All of these projects are located in the Deseado Massif gold district in mining-friendly Santa Cruz province of southern Argentina, which hosts four gold/silver mines and several notable bonanza type precious metal prospects. In Chile, Mariana has a joint venture agreement with US based international mining and natural resources company Cliffs Natural Resources Inc., to explore for Iron Oxide-Copper-Gold deposits (IOCG) in a 92,000 km� area (SCM Mariana Area) in north-central Chile.

The SCM Mariana Area includes two Iron Oxide Copper Gold (IOCG) exploration projects in the highly prospective Atacama Fault Zone, approximately 100 km from Freeports Candelaria Copper Mine: the 44km� Buenaventura and 46km� Perro Chico projects. Additional information:Drilling was undertaken by Boart Longyear Argentina using a rig 25HH-3 core drill.

The drill program is being managed by the Argentina Exploration Manager, Dr Gustavo A.

Rodriguez under supervision of Managing Director Mr John Sutcliffe.

Exploration information in this announcement has been compiled by John Sutcliffe who is a Fellow of the Geological Society of London, a Chartered Engineer and a Member of the Institute of Mining and Metallurgy.

Mr Sutcliffe has sufficient experience relevant to the style of mineralization 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. Sampling and Analytical Details All diamond drill core samples are split on geological contacts with minimum and maximum sample length of 0.5 and 3 meters respectively and represent sawn half HQ-size core.Samples for analysis include certified control standards, quarter core duplicates and blanks.

The 2010 drill programme consisted of 3,752 core samples including a total 342 assay control samples.

All the samples are collected under the supervision of the Company geologists.

During the sample handling procedure, the sample shipments are tracked.

Core samples were placed into uniquely labelled sample bags.

A record of the sample location and other specific details is documented in the sample data base.

All samples were sent to ALS Chemex Labs with preparation facilities in Mendoza and assayed in Chile for gold and multi element ICP analyses.

Rock sample preparation includes weighing, drying, fine crushing of entire sample to better than 70% -2mm, split of 250g and pulverize split to better than 85% passing 75 microns (PREP-31- DRY-22).

The 34 element ME ICP41 package analyses utilize an aqua regia digestion.

Gold analyses for all samples are fire assay and AAS (Au-AA24, 50g nominal sample weight, range 0.005-10 ppm) with any results over 10g/t checked using a gravimetric finish (Au-GRA22- 50 gr , range 0.05- 1.000 g/t).

Silver grades exceeding 100 g/t were assayed by fire assay and gravimetric finish (Ag-GRA21, 30g nominal sample weight, range 5-10,000 ppm).

ALS Chemexs quality system complies with the requirements for the International Standards ISO 9001:2000 and ISO 17025: 1999 Quality Assurance/Quality Control All technical information for the Companys Argentina projects is obtained and reported under a quality assurance and quality control (QA/QC) program.

Certified standards are inserted at an average of one per 20 samples, blanks (in house) at one per 40 samples, while quarter-core duplicates are inserted at intervals of approximately 35 samples.

A total of 9% control samples have been inserted.

Assays that meet the QA/QC are incorporated in the Mariana data base.