Mining of the Sherritt Gordon deposit in the community of Sherridon took place between 1931 and 1951, over which time 7.74 million tonnes were mined at an average grade of 2.46% Cu, 2.84% Zn, 0.6 g/t Au and 33 g/t Ag (Froese & Goetz, 1981). Subsequent exploration was completed in the region by a range of companies, which identified numerous massive sulphide occurrences, typically associated with a similar host-horizon as Sherritt Gordon (Ostry et al, 1998).
Several companies have been involved with exploration of the Sherridon project from the 1950's to present. Most recently, Halo Resources conducted very extensive exploration from 2006 to 2011, including surface geochemistry, airborne and ground geophysics, mapping, extensive drilling resource calculation and metallurgical testwork.
Resource drilling conducted by Halo in 2010 resulted in Indicated and Inferred Mineral Resource calculations as described below.
Indicated and Inferred resources for Bob, Lost, Cold, and Jungle deposits. Mineral Resource estimates are based upon Bloom, L., Healy, T., Giroux, G., Halo Resources Ltd. 2010, Sherridon VMS Property, Technical Report NI43-101 – November 22, 2010, which is available at www.sedar.com.
Mineral Resources were estimated at a net smelter return (NSR) cut-off of US$20 per tonne and US$45 per tonne for open pit and underground respectively. Metal prices used were US$3.00/lb copper, US$1.05/lb zinc, US$1,000/oz gold and US$15.00/oz silver. Metallurgical recovery factors assumed were 92% for copper, 83% for zinc, 65% for gold and 57% for silver.
The Mineral Resource estimates were prepared under the direction of, and dated and signed by, a Qualified Person as defined in accordance with NI 43-101 and CIM Definition Standards. The data, information, estimates, conclusions and recommendations were consistent with the information available at the time of preparation. The terms “mineral resource”, “measured mineral resource”, “indicated mineral resource” and “inferred mineral resource” are defined in NI 43-101 and recognized by Canadian securities laws. Investors are cautioned not to assume that any part or all of mineral deposits in these categories will ever be upgraded to mineral reserves. Aguila has received the exploration and drilling data, but has not independently confirmed the Mineral Resource estimates. Halo has indicated that no Mineral Resource estimates were completed subsequent to those provided in Table above.