|By Marketwired .||
|May 15, 2014 08:00 AM EDT|
VANCOUVER, BRITISH COLUMBIA -- (Marketwired) -- 05/15/14 -- Rio Alto Mining Limited ("Rio Alto" or the "Company") (TSX:RIO)(NYSE:RIOM)(LMA:RIO)(DBFrankfurt:MS2) is pleased to report assay results from 19 reverse circulation ("RC") drill holes within and around the Calaorco Pit at the Company's La Arena Gold Oxide Mine located in La Libertad, northern Peru.
Reference is made to the 2014 oxide gold Reserve Pit which is detailed in the La Arena Project Technical Report with an effective date of December 31, 2013, prepared on behalf of the Company by Mining Plus Peru S.A.C. (the "December 2013 Report"), a copy of which is available under the Company's SEDAR profile at www.sedar.com.
The more significant intercepts were:
CA-R14-007 - 74 m @ 0.42 g/t Au, including 22 m @ 1.06 g/t Au, all of which being outside the 2014 Reserve Pit.
CA-R14-015 - 314 m @ 0.7 g/t Au, of which 166 m @ 0.80 g/t Au being outside the 2014 Reserve Pit.
CA-R14-016 - 230 m @ 0.97 g/t Au, of which 74 m @ 0.67 g/t Au being outside the 2014 Reserve Pit.
Rio Alto acquired the La Arena Gold Project in mid-2009 from IAMGOLD with the objective of bringing the mine into production as rapidly as possible. Twenty months later, the first gold bar at La Arena was poured and since then the Company has produced approximately 550,000 ounces of gold. The principal focus during the first two years of project ownership was to achieve gold production to allow the Company to generate cash flow and fund further expansion and development of the project from this cash flow. Exploration drilling was deferred during this period and only commenced after positive cash flow started to be generated by the project in early 2012.
Since 2012, oxide drilling has resulted in the gold oxide reserve increasing from 821,000 ounces at the beginning of 2011 to 1,056,000 ounces at the beginning of 2014 with approximately 500,000 ounces having been produced during the first two and half years of production. This represents an increase of approximately 780,000 ounces since mining commenced at La Arena.
The following results are from the first 19 RC holes drilled at Calaorco during 2014 with 13 out of the 19 holes intersecting gold mineralization above the mining cutoff grade. These drill holes were within ("Inside") and extended outside or below ("Outside") the 2014 gold oxide Reserve Pit.
The results of the recent drilling program demonstrate that a large amount of oxide brecciated sandstone mineralization (the main mineral type at La Arena) lies outside the 2014 Reserve Pit. The results are very encouraging and indicate the potential to increase oxide gold resources and reserves and the possibility of extending mine life beyond 2019.
A total of 14,200 metres of RC drilling is currently planned to be completed during 2014, in and around the Calaorco Pit. The Company's geologists will interpret the data generated by this drilling program, once it is completed, with the objective of calculating an updated resource and reserve estimate for the gold oxide mineralization at La Arena. Management expects that this drilling program has the potential to allow positive changes to be made to the resource block classification, define new resource blocks and given that the deposit is open to the northwest and at depth, identify new areas to test in order to further increase resources and reserves in the future. The updated resource and reserve estimate for the gold oxide mineralization at La Arena is expected to be released in Q1, 2015.
References to the comments in the following table refer to intercepts within ("Inside") the 2014 Reserve Pit or drill hole intercepts that extended outside or below ("Outside") the 2014 Reserve 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.
Hole ID From To Interval Au g/t Ag g/t Cu ppm Comments ============================================================================ CA-R14-001 Not significant Intercepts CA-R14-002 Not significant Intercepts CA-R14-003 116 176 60 0.31 1.97 77 Inside Reserve Pit Including 116 134 18 0.72 3.56 151 Outside Reserve Pit CA-R14-003 190 218 28 0.44 1.04 176 Outside Reserve Pit CA-R14-004 6 26 20 0.14 0.13 28 Inside Reserve Pit CA-R14-004 92 110 18 0.15 0.21 28 Inside Reserve Pit CA-R14-004 120 168 48 0.38 0.92 36 Outside Reserve Pit CA-R14-005 Not significant Intercepts CA-R14-006 Not significant Intercepts CA-R14-007 12 94 82 0.62 0.62 101 Inside Reserve Pit CA-R14-007 110 138 28 0.19 0.32 16 Outside Reserve Pit CA-R14-007 150 164 14 0.16 0.33 44 Outside Reserve Pit CA-R14-007 202 276 74 0.42 0.51 83 Outside Reserve Pit Including 254 276 22 1.06 1.30 146 Outside Reserve Pit CA-R14-008 Not significant Intercepts CA-R14-009 30 90 60 0.18 0.36 52 Inside Reserve Pit CA-R14-009 112 272 160 0.40 0.71 68 Outside Reserve Pit Including 254 268 14 1.56 0.73 113 Outside Reserve Pit CA-R14-010 Not significant Intercepts CA-R14-011 Not significant Intercepts CA-R14-012 Not significant Intercepts CA-R14-013 28 44 16 0.29 0.73 16 Inside Reserve Pit CA-R14-013 66 76 10 0.23 0.74 17 Inside Reserve Pit CA-R14-013 108 118 10 0.16 0.32 23 Outside Reserve Pit CA-R14-013 132 150 18 0.18 0.32 21 Outside Reserve Pit CA-R14-013 166 248 82 0.25 0.26 66 Outside Reserve Pit Including 166 188 22 0.46 0.39 163 Outside Reserve Pit CA-R14-014 18 56 38 0.20 0.13 60 Inside Reserve Pit CA-R14-014 64 118 54 0.70 0.55 55 Inside Reserve Pit Including 82 86 4 1.26 1.15 24 Inside Reserve Pit Including 102 108 6 4.10 1.57 238 Inside Reserve Pit CA-R14-014 156 162 6 1.93 0.87 226 Outside Reserve Pit CA-R14-014 152 222 70 0.35 0.34 50 Outside Reserve Pit Including 206 210 4 1.12 0.30 133 Outside Reserve Pit CA-R14-014 232 282 50 0.74 0.19 88 Outside Reserve Pit Including 266 280 14 1.90 0.24 233 Outside Reserve Pit CA-R14-014 294 304 10 0.15 0.22 11 Outside Reserve Pit CA-R14-015 0 8 8 0.29 0.10 113 Inside Reserve Pit CA-R14-015 22 336 314 0.70 0.21 113 Inside Reserve Pit Including 22 26 4 2.15 0.10 432 Inside Reserve Pit Including 72 86 14 0.96 0.21 43 Inside Reserve Pit Including 96 110 14 2.18 0.53 72 Outside Reserve Pit Including 170 336 166 0.80 0.24 137 Outside Reserve Pit CA-R14-016 0 230 230 0.97 0.72 78 Inside/Outside Reserve Pit Including 0 36 36 2.75 1.11 28 Inside Reserve Pit Including 156 230 74 0.67 0.70 123 Outside Reserve Pit Including 214 230 16 1.38 1.99 242 Outside Reserve Pit CA-R14-017 0 164 164 0.45 0.17 80 Inside/Outside Reserve Pit Including 40 48 8 1.72 0.23 372 Inside Reserve Pit Including 82 94 12 1.69 0.15 269 Inside Reserve Pit CA-R14-017 206 226 20 0.23 0.10 17 Outside Reserve Pit CA-R14-018 102 210 108 0.20 0.80 32 Inside Reserve Pit Including 114 128 14 0.82 1.63 73 Outside Reserve Pit CA-R14-019 30 78 48 0.72 0.68 69 Inside Reserve Pit Including 38 68 30 1.04 0.67 94 Inside Reserve Pit CA-R14-019 88 138 50 0.21 0.65 22 Inside Reserve Pit CA-R14-019 172 210 38 0.49 1.22 211 Outside Reserve Pit Including 182 192 10 0.85 1.78 80 Outside Reserve Pit CA-R14-019 224 241 17 0.32 0.35 32 Outside Reserve Pit
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 CERTIMIN 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. CERTIMIN is an ISO 9001:2000 certified laboratory.
Phase II Update
Good progress is being made in respect to the completion of the feasibility study for the Phase II copper/gold project at La Arena. On January 6, 2014, the Company announced that it had received formal notification from the Ministry of Energy and Mines of Peru that approval had been given for modifications to its Environmental Impact Study (EIA) for the La Arena Project Gold Oxide Mine. This EIA modification allows Rio Alto to apply for permits for a future Phase II open pit sulphide mine, construct an 18,000 tonne per day copper/gold concentrator, expand the current waste dump facilities to accommodate sulphide waste and to use the Calaorco Pit for tailings deposition once open pit oxide reserves are exhausted. However, the recent increase in the size of the adjacent gold oxide deposit and possible expansion of the oxide resources and reserves as a consequence of the ongoing drill program, has meant that the general layout of the Phase II infrastructure needs to be revised. It is important that none of the Phase II infrastructure, such as process plant, conveying systems, stockpiles and waste dumps are impeding the possible future expansion of the oxide mine and its associated infrastructure. This revision of the general layout has meant that the completion of the feasibility study will be delayed until later in the year. Current estimates for timing are sometime in Q4, 2014.
"We are all excited at the results coming out of our current oxide drilling program at La Arena. It is hoped that the program underway can increase the size and life of the gold oxide mine and provide our technical team with a better understanding of what the optimal general layout for Phase II should be. La Arena has been a great project from the outset and continues to evolve positively for all stakeholders involved," commented Alex Black, President & CEO.
Mr. Enrique Garay, MSc. P.Geo (AIG Member), Vice President Geology of Rio Alto, is the Qualified Person (as defined by NI 43-101) responsible for managing the Company's exploration programs and disclosure of drilling results. Mr. Garay has read and approved the scientific and technical information in this news release.
For additional information regarding La Arena Project please refer to the December 2013 Report prepared on behalf of the Company by Mining Plus Peru S.A.C., a copy of which is available on the Company's SEDAR profile at www.sedar.com.
Certain statements contained herein constitute forward-looking statements, most particularly the potential to increase the resource and reserve estimate of the gold oxide mineralization at La Arena Project, the timing for the completion of an updated resource and reserve estimate for the gold oxide mineralization at La Arena Project, to extend the life of La Arena Gold Oxide Mine and the timing for the completion of a feasibility study for the La Arena copper/gold sulphide project. All statements included herein, other than statements of historical fact, are forward-looking information and such information involves various risks and uncertainties. Rio Alto believes the expectations reflected in these forward looking statements are reasonable but no assurance can be given that these expectations will prove to be correct and such forward-looking statements in this press release should not be unduly relied upon. 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. Forward-looking statements included in this press release are made as of the date of this press release and Rio Alto disclaims any intention or obligation to update or revise any forward-looking statements, whether as a result of new information, future events or otherwise, except as expressly required by applicable securities legislation.
ON BEHALF OF THE BOARD OF RIO ALTO MINING LIMITED
Alex Black, President, CEO & Director
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