Investor Presentaiton

Additional Information - HUDBAY The reserve and resource estimates included in this presentation were prepared in accordance with National Instrument 43-101 Standards of Disclosure for Mineral Projects ("NI 43-101") and the Canadian Institute of Mining, Metallurgy and Petroleum Standards on Mineral Resources and Reserves: Definitions and Guidelines. MANITOBA • Mineral resources are exclusive of and additional to stated mineral reserves. Mineral resources that are not mineral reserves do not have demonstrated economic viability. • To estimate mineral reserves, measured and indicated mineral resources were first estimated in a 12-step process, which includes determination of the integrity and validation of the data collected, including confirmation of specific gravity, assay results and methods of data recording. The process also includes determining the appropriate geological model, selection of data and the application of statistical models including probability plots and restrictive kriging to establish continuity and model validation. The resultant estimates of measured and indicated mineral resources are then converted to proven and probable mineral reserves by the application of mining dilution and recovery, as well as the determination of economic viability using full cost analysis. Other factors such as depletion from production are applied as appropriate. Estimated inferred mineral resources within our mines were estimated by a similar 12-step process, used to estimate measured and indicated resources. Hudbay's four-year average metal price and foreign exchange rate forecasts were used to estimate mineral reserves and mineral resources at the 777 and Reed mines. The zinc price was $1.16 per pound (includes premium), the copper price was $2.75 per pound, the gold price was $1,190 per ounce and the silver price was $16.50 per ounce using an exchange rate of 1.25 C$/US$. • The zinc price used for mineral reserve and resource estimations for the Lalor mine was $1.07 per pound (includes premium), the copper price was $3.15 per pound, the gold price was $1,260 per ounce and the silver price was $18.00 per ounce using an exchange rate of 1.10 C$/US$. The reserve statements at Lalor are not significantly impacted by lower long-term metal prices of $3.00 per pound or $2.75 per pound; however, they may not be optimized at those prices. For additional details relating to the estimates of mineral reserves and resources at the 777 mine, including data verification and quality assurance/ quality control processes refer to the "Technical Report 777 Mine, Flin Flon, Manitoba, Canada" dated October 15, 2012 on SEDAR. For additional details relating to the estimates of mineral reserves and resources at Lalor mine, including data verification and quality assurance/ quality control processes refer to the "Pre-Feasibility Study Technical Report, on the Lalor Deposit❞ dated March 29, 2012 on SEDAR. •⚫ For additional details relating to the estimates of mineral reserves and resources at the Reed mine, including data verification and quality assurance/ quality control processes refer to the "Pre-Feasibility Study Technical Report on the Reed Copper Deposit, Central Manitoba, Canada" as filed on SEDAR by VMS Ventures Inc. on May 14, 2012. 38

View entire presentation