Rio Alto Drills 238 Metres of 1.06 Grams of Gold Per Tonne
Published : July 20, 2011
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Keywords :   Aig | Copper | Diamond | Gold | Peru | Recovery | Silver |

VANCOUVER, BRITISH COLUMBIA--(Marketwire - July 20, 2011) - Rio Alto Mining Limited ("Rio Alto" or the "Company") (TSX VENTURE:RIO)(OTCQX:RIOAF)(BVLAC:RIO)(DBFrankfurt:MS2) is pleased to report assay results from 18 reverse circulation ("RC") drill holes within and around the Calaorco Pit at the Company's La Arena Gold Oxide Mine ("Oxide Mine") located in La Libertad, northern Peru.

Significant intercepts were:

Hole Intercept (mts) Gold Grade (g/t)
CA-R11-038 158 0.58
CA-R11-039 200 0.46
CA-R11-047 238 1.06
CA-R11-049 148 0.65
CA-R11-050 104 1.72
CA-R11-050 158 0.51

The following results are from the last 18 RC holes drilled at Calaorco with 15 out of the 18 holes intersecting gold mineralization above the mining cutoff grade. These drill holes were within ("Inside") and extended outside or below ("Below") the current design of the Calaorco Pit.

A total of 13,674 metres of RC drilling in 50 holes has been completed at the Calaorco Pit and this drill program is complete for this year. The Company's geologists are interpreting the data generated by these 50 holes to calculate an updated resource estimate for the Calaorco Pit. Management expects that this drilling program will result in positive changes to the resource block classification; define new resource blocks; and given that the deposit is open to the northwest and southeast identify new areas to test in order to increase resources. The updated resource estimate for the Calaorco Pit is planned for release in Q4 2011.

Drill Results

References to "Pit Location" in the following table refer to intercepts within ("Inside") the Calaorco Pit or drill hole intercepts that extended outside or below ("Below") the Calaorco Pit. A map illustrating drill hole locations and selected drill hole cross sections related to this press release may be accessed by following this link: http://media3.marketwire.com/docs/FiveMapsRIO.pdf.

Hole ID From To Interval Au g/t Ag g/t Pit
Location
RC33 240 286 46 0.28 0.42 Inside
RC34 Below the cut off grade
RC35 180 226 46 0.20 0.37 Inside
RC36 Below the cut off grade
RC37 Below the cut off grade
RC38 4 162 158 0.58 0.33 Inside
  Including 52 64 12 1.87 0.33 Inside
  Including 92 148 56 0.76 0.49 Inside
RC39 30 230 200 0.46 0.41 Inside
  Including 66 84 18 2.23 0.83 Inside
RC40 124 142 18 0.78 0.52 Inside
RC40 278 296 18 0.59 0.32 Below
RC41 0 22 22 0.43 0.20 Inside
RC41 220 238 18 0.38 0.81 Below
RC42 76 146 70 0.21 0.47 Inside
RC42 180 218 38 0.12 0.25 Below
RC42 246 291 45 0.32 0.47 Below
RC43 0 30 30 0.52 0.42 Inside
RC44 84 146 62 0.37 0.65 Inside
RC44 244 300 56 0.22 0.35 Below
RC45 66 134 68 0.28 0.61 Inside
RC45 204 210 6 0.54 1.47 Below
RC46 20 34 14 0.51 0.33 Inside
RC47 0 238 238 1.06 0.44 Below
  Including 18 90 72 1.36 0.59 Inside
  Including 160 168 8 8.33 0.83 Inside
  Including 220 238 18 1.54 0.32 Below
RC48 0 92 92 0.97 0.26 Inside
RC48 128 166 38 0.86 0.45 Inside
RC49 0 148 148 0.65 0.68 Inside
  Including 36 72 36 2.10 1.49 Inside
RC49 186 236 50 0.13 0.29 Below
RC49 256 274 18 0.24 0.40 Below
RC50 0 104 104 1.72 0.38 Below
  Including 56 98 42 2.61 0.61 Below
RC50 142 300 158 0.51 0.60 Below
  Including 144 180 36 1.32 0.76 Below

Sulphide Drilling Program

The drilling program at the La Arena Copper/Gold sulphide project started this week. The Company has three Diamond core drilling rigs on site with a fourth due in August. The current program involves drilling 55 Diamond core holes for a total of 32,330 metres. Drilling depth will vary between 400 to 750 m in order to: upgrade the category of resource blocks from inferred to indicated; define new resource blocks; and identify new areas to test in order to increase resources. During the past 6 months, in preparation for the sulphide drilling program, the Company´s geological team has reinterpreted the mineral distribution, structures, lithology and alteration of the pre-existing geological model. This reinterpretation will be tested by the planned 55 holes.

Astrid Prospect (Oxides)

On June 15, 2011, the Company announced that the Astrid Prospect, a gold oxide exploration target, located approximately 500 metres north of the Calaorco Pit had been identified by surface mapping and geochemical sampling. This target has the same geological and geochemical characteristics as Calaorco and contains gold mineralization hosted in oxidized brecciated sandstone. The current surface footprint of the Astrid Prospect is 500 metres by 200 metres, over which the Company is conducting a 14 Km IP (induced polarization) and Ground Magnetic survey. The Company plans to start a first pass RC drilling program at Astrid in late August.

Quality Control and Assurance

Sampling of the reverse circulation drilling and sample preparation were performed by Rio Alto personnel and were carried out under strict protocols recommended in the NI 43-101 Technical Report dated July 31, 2010 prepared by Coffey Mining Pty Ltd for the Company (the "Report"). Samples were taken every 2m and split in half to yield seven to ten kilogram samples. Drill sample recovery was generally in excess of 90%. Rio Alto has a rigorous QA/QC program over the chain-of-custody of samples and the insertion of blanks, duplicates, and certified reference standards in each batch of samples. Samples were shipped to CIMM-Peru in Lima where they were dried, crushed, pulverized, and assayed. All gold assays were obtained by standard 50g fire assaying with AA finish. All silver assays reported in the press release were obtained by Aqua-Regia dissolution followed by ICP measurement. CIMM-Peru is an ISO 9001:2000 certified laboratory.

Enrique Garay, M Sc. P. Geo. (AIG Member), Vice President Geology of Rio Alto is the Qualified Person responsible for the management of the exploration program and disclosure of the drill results as defined by National Instrument 43-101. Mr. Garay has read and approved the scientific and technical information in this news release. For additional information regarding the Oxide Mine and the sulphide project please refer to the Report, a copy of which is available under Rio Alto's SEDAR profile at www.sedar.com.

This news release contains certain forward-looking information including statements concerning the expected timing for the arrival of drills at La Arena, the timing of a new resource estimate for the Calaorco Pit and the timing and scope of exploration programs at the Company´s sulphide project and Astrid prospect. All statements included herein, other than statements of historical fact, are forward-looking information and such information involves various risks and uncertainties. There can be no assurance that such information will prove to be accurate, and actual results and future events could differ materially from those anticipated in such information. A description of assumptions used to develop such forward-looking information and a description of risk factors that may cause actual results to differ materially from forward-looking information can be found in Rio Alto's disclosure documents on the SEDAR website at www.sedar.com. Rio Alto does not undertake to update any forward-looking information except in accordance with applicable securities laws.

To learn more about Rio Alto Mining Limited, please visit: www.rioaltomining.com or Rio Alto's SEDAR profile at www.sedar.com.

ON BEHALF OF THE BOARD OF RIO ALTO MINING LIMITED

Alex Black, President & COO

Neither TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in the policies of the TSX Venture Exchange) accepts the responsibility for the adequacy or accuracy of this release.

Rio Alto Mining Limited
Alex Black
President & COO
+51 1 625 9900 or +51 99279 4655
alexb@rioaltomining.com
or
Rio Alto Mining Limited
Alejandra Gomez
Investor Relations
+1 604 628 1401
+1 866 393 4493 (FAX)
alejandrag@rioaltomining.com
www.rioaltomining.com
Data and Statistics for these countries : Peru | All
Gold and Silver Prices for these countries : Peru | All

Rio Alto Mining Limited

DEVELOPMENT STAGE
CODE : RIO.TO
ISIN : CA76689T1049
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Rio Alto is a copper and gold development stage company based in Canada.

Rio Alto develops copper, gold and silver in Peru, and holds various exploration projects in Mexico.

Its main asset in development is LA ARENA in Peru and its main exploration properties are ANILLO DE FUEGO, PROVIDENCIA, RAL ( LA IGUANA ), VALLECILLO, MAMULIQUE and LA BLANCA in Mexico.

Rio Alto is listed in Canada. Its market capitalisation is CA$ 793.2 millions as of today (US$ 798.5 millions, € 597.1 millions).

Its stock quote reached its lowest recent point on December 26, 2008 at CA$ 0.07, and its highest recent level on February 23, 2012 at CA$ 4.54.

Rio Alto has 175 886 000 shares outstanding.

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In the News and Medias of Rio Alto Mining Limited
1/31/2008Follow up N° 2
Annual reports of Rio Alto Mining Limited
2007 annual report
2007 Q1 report
2006 Q3 report
2006 annual report
Financings of Rio Alto Mining Limited
11/30/2010Completes First Tranche of Private Placement for C$12.8 Mill...
1/7/2009Extends Expiry Date of Outstanding Warrants
12/23/2008Proposes to Extend Expiry Date of Outstanding Warrants
Option Grants of Rio Alto Mining Limited
7/23/2009Name Change to Rio Alto Mining Limited and Grant of Stock Op...
5/25/2009Announces Grant of Stock Options
Nominations of Rio Alto Mining Limited
3/14/2011Announces Appointment of Victor Gobitz and Sidney Robinson t...
2/18/2011Announces the Departure of Feisal Somji
6/17/2008Appoints Jose Sayo Garcia as VP Exploration and Brings Addit...
Project news of Rio Alto Mining Limited
4/29/2011(La Arena)Drills 173 Metres of 1.53 Grams of Gold Per Tonne
2/9/2011(La Arena)Announces Acquisition of 100% of La Arena Project
8/5/2009(La Arena)La Arena Surface Rights and Project Update
6/29/2009(La Arena)Confirms Option Agreement on La Arena and Equity Position in...
7/7/2008(Mamulique)Commences First Phase Drilling at the Mamulique Project
6/4/2008(Ral ( La Iguana ))Reports Extension of Mantos in the First Phase of Drilling a...
5/12/2008(La Blanca)Discovers New High Grade Veins
3/25/2008(Vallecillo)Initiates IP Geophysics at Vallecillo
2/19/2008(Mamulique) Announces Positive Exploration Results and Drill Plan for t...
1/30/2008(Ral ( La Iguana ))Announces an Exploration Update on its Iguana Project
1/23/2008(Vallecillo)Reports further drill results from the Vallecillo drill prog...
Corporate news of Rio Alto Mining Limited
4/1/2015Tahoe Resources and Rio Alto Mining Announce Completion of M...
3/30/2015Announces Shareholder and Court Approval of the Plan of Arra...
3/16/2015Announces Net Income of US$49.8 Million for 2014
7/20/2011Drills 238 Metres of 1.06 Grams of Gold Per Tonne
6/15/2011Drills 134 Metres of 2.29 Grams of Gold Per Tonne
5/9/2011(La Arena)Pours 1,115 Oz of Gold at La Arena
6/30/2009Completes Acquisition of Rio Alto Mining Limited
6/22/2009Enters Definitive Agreement to Acquire Rio Alto Mining Limit...
3/10/2009Enters into Letter of Intent to Acquire Rio Alto Mining Limi...
2/25/2009at 2009 Prospectors & Developers Association of Canada Confe...
12/19/2008Featured on Business Television
11/19/2008Provides a Corporate Update and Initiates Review of Strategi...
4/23/2008 Grants and Re-Prices Options
4/8/2008 Announces the Addition of Jim Glass to Board of Directors
2/29/20082007 Q3 Report
1/28/2008Announces Exploration Results from the Magnolia Mine Area wi...
12/5/2007 Announces Positive Drill Assay Results From Vallecillo and ...
11/30/20072007 Q2 report
11/19/2007 Acquires the Voladora Mine in the State of Nuevo Leon
10/31/2007Increases Drill Program at Vallecillo
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