VANCOUVER, BRITISH COLUMBIA -- (Marketwire) -- 03/28/13 -- SilverCrest Mines Inc. (TSX VENTURE: SVL)(NYSE MKT: SVLC) ("SilverCrest" or the "Company") is pleased to announce the filing of a National Instrument 43-101 compliant updated La Joya resources Technical Report ("Technical Report") including preliminary metallurgical test results for the La Joya Property in Durango, Mexico. The Technical Report - titled "Updated Resource Estimate for the La Joya Property, Durango, Mexico" dated March 27, 2013 - has been filed on SEDAR and is available at www.sedar.com. This Technical Report supports the Company's January 29, 2013 news release which announced the updated resource estimation.
The updated Inferred Resources(ii) and sensitivities are summarized as (refer to tables below for details);
- Cutoff grade of 15 gpt silver equivalent 198.6 million ounces Ag Eq (Ag Eq(i),Global Case):- Cutoff grade of 30 gpt Ag Eq (Base Case); 159.8 million ounces Ag Eq- Cut-off grade of 60 gpt Ag Eq (High Grade 100.8 million ounces of Ag Eq Case);- Cut-off grade of 0.05% WO3; 75.1 million pounds (35,700 tonnes) of WO3
(i) Silver equivalency includes silver, gold and copper and excludes lead, zinc, molybdenum and tungsten values. Ag:Au is 50:1, Ag:Cu is 86:1, based on 5 year historic metal price trends of US$24/oz silver, US$1200/oz gold, US$3/lb copper. 100% metallurgical recovery is incorporated until further information is available.
(ii) Classified by EBA, A Tetra Tech Company and conforms to NI 43-101 and CIM definitions for resources. All numbers are rounded. Inferred Resources have been estimated from geological evidence and limited sampling and must be treated with a lower level of confidence than Measured and Indicated Resources. The reported Mineral Resource is based on the 30 gpt AgEQ and 0.050% WO3 cut-off.
The Company believes that the 60 gpt Ag Eq portion of the deposit, with an estimated tonnage of 27.9 million tonnes grading 112 grams per tonne Ag Eq(i), constitutes a priority area to be examined as a potential "Starter Pit" for initial conceptual operations. A Preliminary Economic Assessment (PEA) that commenced in January 2013 will examine the Starter Pit concept in detail. The La Joya Property has excellent potential for additional resources with the deposits (Main Mineralized Trend - "MMT", Santo Nino and Coloradito) being open in most directions. Further infill and expansion drilling has been recommended to increase and convert resources from Inferred to Indicated.
After the initial metallurgical test work was completed in 2011 at the Laboratories of Instituto Tecnologico de Saltillo, Mexico, subsequent metallurgical test work was completed in 2012 and is being continued in 2013 at ALS Metallurgy ("ALS") in Kamloops, BC, Canada. Current results from batch cleaner flotation tests indicate that the MMT mineralization at La Joya is amenable to conventional flotation processes for production of high grade copper concentrates with high silver and gold credits. The near-surface (priority) Manto composite produced a bulk concentrate (the 3rd cleaner concentrate Cu-Ag-Au) grading up to 40% Cu, 4,780 gpt Ag and 13.1 g/t Au. Structure composite produced a bulk concentrate containing up to 38% Cu, 4,760 gpt Ag, and 9.4 gpt Au. The bulk concentrate produced from Contact Zone composite grades up to 29% Cu, 818 gpt Ag, and 18.8 gpt Au. Concentrates in excess of 25% copper are considered to be a premium product for smelter feed. The high copper grades in La Joya bulk concentrates are mostly attributable to the varied amounts of bornite, covellite and chalcocite in the tested materials.