Mariana Resources Ltd., the AIM and TSX quoted exploration and development company focused in Argentina and Chile, is pleased to report on drilling results from the final 17 holes from the Q1/Q2 2011 drilling programme at the Calandria Norte target area at its 100% owned Las Calandrias Gold-Silver Project, in southern Argentina.

Highlights

-- Scout drilling intersects first high-grade gold at La Morena and Tongoril vein-breccias outside the La Calandria initial resource outline at Calandria Norte.

-- Hole CND250 at La Morena intersected 0.6m @ 68.1 g/t gold ("Au") and 107 g/t silver ("Ag") (69.9g gold equivalent ("AuEq")) in a vein-breccia from 59m within a broad stockwork intercept of 19.5m @ 3.3 g/t Au and 8 g/t Ag from 45m.

-- The La Morena vein-breccia mineralisation strikes NNE for 350m, dips steeply SSE and is open all directions.

-- Tongoril vein-breccia scout hole CND241 intersected 6m @ 1.6 g/t Au and 0.6 g/t Ag in a 200m NE-SW untested vein-breccia trend, close to the dome margin about 75m SE of La Calandria vein.

-- Deepest mineralisation to date intersected at La Calandria Vein-breccia 200m below surface in CND 247 - 0.53 m @ 23.7 g/t Au and 21 g/t Ag from 221.9m.

-- Shallow scissor hole CND240 in central zone of La Calandria vein-breccia intersected 21.5m of stockwork/breccia @ 1.0 g/t Au and 6 g/t Ag from 31m in the vein footwall.

-- La Calandria Vein-breccia is open at depth to ENE and SSW.

-- The La Calandria trend has increased to over 1km with the discovery of the untested El Clavo mineralised structure striking 550m SW into surrounding volcaniclastics.

-- The 12 holes at La Calandria were not included in the maiden NI 43-101- compliant resource estimate which includes both high-grade vein-breccia and low-grade stockwork mineralization.

-- La Calandria resource estimate is 886,000t Indicated @ 2.26 gAuEq/t (contained gold 61,000 ozs, silver 159,000 ozs) and 366,000t Inferred @ 1.17 gAuEq/t (contained gold 13,100 oz and 39,000 oz silver).

-- Resource estimates for Calandria Sur and La Calandria are 11,840,000t @ 1.0 g/t gold (Au) and 17.4 g/t silver (Ag) Indicated and 870,000t @ 0.93 g/t Au and 5.17 g/t Ag Inferred.Commenting today, Chairman John Horsburgh said, "Having announced positive results from Calandria Sur drilling last week, we are very encouraged that the gold intersections along the La Morena and Tongoril trends highlight the potential of the Calandria Norte Dome to host multiple vein-breccias. La Morena vein-breccia, the dome root zone where the high grade vein-breccia systems could converge, lateral extensions to La Calandria vein-breccia mineralisation and the untested 550m La Calandria strike extension are compelling targets for the next drill campaign, due to commence in August 2011."

Drilling Programme

Seventy-three diamond holes have been drilled to date at Calandria Norte for 10,586m. The programme last quarter consisted of 17 holes totaling 2,669m. Of these, 12 were drilled at La Calandria vein-breccia, two at La Morena, two at Tongoril and one at other targets. Refer to drill plan (Figure 1) for hole locations, longitudinal section (Figure 2), cross sections (Figures 3-5) and summary of significant intersections in the table below.

The recent resource study has included La Calandria vein-breccia but these drill results were received too late for inclusion in the resource model. The results will be integrated in a subsequent resource update.

La Morena Vein-breccia

One of two holes drilled at the La Morena target in the northern part of Calandria Norte rhyolite dome, 250m NW of La Calandria vein-breccia, intersected high grade mineralisation - 0.6m @ 68.1 g/t Au and 107g/t Ag (69.9 g/t AuEq) from 59m in CND250. La Morena is a branching NNE striking vein-breccia system, dipping steeply SE with a wide hangingwall stockwork.

Seven previous shallow holes intersected concealed chalcedonic silica and sulphide vein-breccia along a 350m trend with a best intersection of 0.8m @ 12.0 g/t Au and 32 g/t Ag from 90m (in CND146). Narrow high-grade silver mineralisation was intersected in CND152, 180m ENE of CND146, with 1m @ 981 g/t Ag from 140 m. The vein-breccia system has no surface expression and was discovered by drilling the SW end of chargeability Induced Polarisation anomaly.

La Calandria Vein-breccia

Results were received for 12 holes drilled as infill or for possible extensions to the vein-breccia system. CND247 which intersected 0.53m @ 23.7 g/t Au and 21 g/t Ag from 221.9m is one of the deepest intersections along the zone 200m below surface which is open at depth and along strike. Hole CND247 is outside the resource outline. The other holes are mostly within the outline and support the initial resource estimation (see below).

In the central-east sector, shallow scissor hole CND240 intersected a wide zone of stockwork veinlets and quartz breccias assaying 21.5m @ 1.0 g/t Au & 6 g/t Ag from 31m in the footwall of the vein-breccia.

In the western lateral zone, two additional holes (CND226-CND227) west of bonanza intersection CND132 - 0.8m @ 90.2 g/t Au and 198 g/t Ag from 132.1m, 120m below surface, did not intersect the vein structure.

The updated gm-m Au longitudinal section (Figure 2) shows +10gm-m Au mineralisation commencing at 30m below surface at its centre and 100m below surface on the flanks. The vein system (up to 1.5m wide) dips steeply NW strikes for 500m and has a vertical extent of 125m, increasing to 200m or more on the northeastern flank. The zone remains open at depth on the ENE and WSW flanks.

Tongoril Vein-breccia

The Tongoril vein-breccia trends NE-SW for approximately 200m close to the dome margin about 75m SE of La Calandria.