Details on the parameters of the resource estimate are as follows:
-- The resource estimation was based on data from 173 drill holes comprising a total length of 50,612 meters of drilling completed to the end of December 2012.
-- There were a total of 23,178 individual samples selected for analysis. The samples were collected and analyzed in accordance with industry standards. Splits from the drill core samples were submitted to either Alex Stewart in Mendoza or ALS Chemex or ACME in Santiago, Chile for fire assay and ICP analysis. Accuracy of results is tested through the systematic inclusion of standards, blanks and check assays.-- The January 2013 mineral resource estimate for the Los Azules Copper Project was prepared under the direction of Robert Sim, P.Geo. of SIM Geological Inc. The mineral resource estimate uses drill hole sample assay results and the interpretation of a geologic model that relates to the spatial distribution of copper in the deposit. Interpolation characteristics were defined based on the geology, drill hole spacing and geostatistical analysis of the data. Block grade estimates were done using Ordinary Kriging (OK) with a nominal block size measuring 20 meters long, 20 meters wide and 15 meters high. Resources are classified according to their proximity to sample data locations and are reported, as required under NI 43-101, according to the CIM Definition Standards for Mineral Resources and Mineral Reserves.-- Mineral resources, which are not mineral reserves, do not have demonstrated economic viability.-- The quantity and grade of reported Inferred resources are uncertain in nature and there has been insufficient exploration to classify these inferred resources as Indicated or Measured, and it is uncertain if further exploration will result in upgrading them to an Indicated or Measured category.-- As required under NI 43-101, reasonable prospects for economic viability of the mineral resources has been exhibited by the application of a resource limiting pit shell built about copper grades in the model using a projected metal price of US$2.75 per lb. Cu, mining costs of US$1.00 per tonne, milling and G&A costs of US$4.25 per tonne, 100% recoveries and an average pit slope of 34 degrees.
About McEwen Mining (www.mcewenmining.com)
The goal of McEwen Mining is to qualify for inclusion in the S&P 500 by 2015 by creating a high growth, low-cost, mid-tier gold producer focused in the Americas. McEwen Mining's principal assets consist of the San Jose Mine in Santa Cruz, Argentina (49% interest); the El Gallo Complex in Sinaloa, Mexico; the Gold Bar Project in Nevada, US; the Los Azules Project in San Juan, Argentina and a large portfolio of exploration properties in Argentina, Nevada and Mexico.
McEwen Mining has 296,024,859 shares issued and outstanding. Rob McEwen, Chairman, President and Chief Owner, owns approximately 25% of the shares of the Company. As of December 31, 2012, McEwen Mining had cash and liquid assets of approximately US$70 million and is debt free.
Robert Sim, P.Geo., who is a Qualified Person and independent of McEwen Mining, each as defined by National Instrument 43-101 ("NI 43-101") has reviewed and approved the technical content of this news release related to the mineral resource estimate presented herein. Notwithstanding, Bruce Davis, PhD, FAusIMM, who is a Qualified Person and independent of McEwen Mining, as defined by NI 43-101 and responsible for the quality control for the assaying of the Los Azules drill core has reviewed the assay quality control information. All samples were collected in accordance with industry standards. Splits from the drill core samples were submitted to the ACME sample preparation laboratory in Mendoza, Argentina, and then transferred to ACME's laboratory in Santiago, Chile for fire assay and ICP analysis. Accuracy of results is tested through the systematic inclusion of standards, blanks and check assays. The mineral resource estimate referenced in this press release was prepared in January 2013 by Robert Sim, P.Geo. and Bruce Davis, PhD, FAusIMM.