CIM (2014) Definition Standards were followed for Mineral Reserves. Mineral Resources are inclusive of Mineral Reserves. Mineral Resources that are not Mineral Reserves do not have demonstrated economic viability. Tonnage and grade measurements are in metric units. Contained gold is reported as troy ounces. Mineral resources do not include factors such as mining dilution or mining recovery. Summation errors may be present due to rounding. See Cautionary Notes on this website.

 

Details of cut-off grades, bulk densities, mining widths, dilution, mining factors and process recovery assumptions applied to Mineral Reserves and Mineral Resources are provided in the Technical Reports for each mine/project.

 

The Mesquite Mineral Reserves and Mineral Resources were reported in the “Technical Report on the Mesquite Gold Mine, California, U.S.A.” (the “Mesquite Technical Report”) dated March 18, 2020 with an effective date of December 31, 2019, prepared by AGP Mining Consultants Inc. The Qualified Persons as defined by National Instrument 43-101 who prepared or supervised the preparation of the information contained in the report are Bruce Davis, FAusIMM (BD Resource Consulting, Inc.), Nathan Robison, PE (Robison Engineering Company Inc.), Ali Shahkar P.Eng. (Lions Gate Geological Consulting Inc.), Robert Sim, P.Geo. (SIM Geological Inc.), Jefferey Woods, SME MMAS (Woods Process Services, LLC) and Gordon Zurowski, P.Eng (AGP). Mineral Resources are reported exclusive of Mineral Reserves. Mineral Resources were restricted between the December 31, 2019 Reserve pit designs and the ultimate resource limiting pit shell based on a gold price of $1,500/oz, mining cost of $1.60/ton mined and a processing cost of $2.26/ton ore and G&A was $0.77/ton ore. Oxide and oxide transition have an assumed recovery of 75% and cut-off grade of 0.078 g/t. Non-oxide and non-oxide transition have an assumed recovery of 35% and cut-off grade of 0.166 g/t. Waste dump material has an assumed recovery of 75% and cut-off grade of 0.125 g/t. Ali Shahkar P.Eng. of Lions Gate Geological Consulting Inc. is the Qualified Person under NI 43-101 responsible for the in-situ mineral resource estimation. Robert Sim, P.Geo. of SIM Geological Inc. is the Qualified Person under NI 43-101 responsible for the waste dump mineral resource estimation. Numbers may not total due to rounding. Mineral Resources are not Mineral Reserves and do not have demonstrated economic viability. The Mineral Reserve estimate has an effective date of December 31, 2019 and is based on the Mineral Resource estimate dated December 31, 2019 prepared by Lions Gate Geological Consulting Inc. The Mineral Reserve calculation was completed under the supervision of Gordon Zurowski, P.Eng. of AGP, who is a Qualified Person as defined under NI 43-101. Mineral Reserves are stated within the final design pit based on a $1,350/oz gold price. The cut-off grade varied by material type from 0.125 g/t for oxide and oxide-transition and 0.281 g/t for non-oxide transition and non-oxide materials. The mining cost averaged $1.60/ton mined, processing costs are $2.26/ton ore and G&A was $0.77/ton ore placed. The ore recoveries were 75% for oxide and oxide-transition, and 35% for non-oxide transition and non-oxide material.

 

The Aurizona Mineral Reserves and Mineral Resources were reported in the “Technical Report on the Aurizona Gold Mine” (the “Aurizona Technical Report”) dated April 27, 2020 with an effective date of January 24, 2020, prepared by AGP Mining Consultants Inc. The Qualified Persons as defined by National Instrument 43-101 who prepared or supervised the preparation of the information contained in the report are Eleanor Black, P.Geo. and Trevor Rabb, P.Geo, of Equity Exploration Consultants Ltd. and Neil Lincoln and Gordon Zurowski of AGP Mining Consultants Inc. Mineral Resources are reported exclusive of Mineral Reserves. The Mineral Resource statement was prepared by Trevor Rabb, P.Geo. of Equity Exploration Consultants Ltd. who is a Qualified Person as defined by National Instrument 43-101. Mineral Resources from the Piaba Open-Pit, Piaba Underground and Boa Esperança have an effective date of December 31, 2019. Mineral Resources from Tatajuba have an effective date of January 24, 2020. Mineral Resources are reported using a gold price of $1,500/oz. Open-pit Mineral Resources are reported using a cut-off grade of 0.6 g/t gold and are constrained using an optimized pit generated using Lerchs-Grossman pit optimisation algorithm using $1,500/oz gold price, costs of $2.32/t mining, up to $12.13/t processing, $2.84/t G&A and gold recovery up to 92.6%. Underground Mineral Resources are reported using a cut-off grade of 1.0 g/t gold and constrained by using a 1.0 g/t gold confining solid. Mineral Resources are not Mineral Reserves and do not have demonstrated economic viability. The Mineral Reserve estimate has an effective date of December 31, 2019 and is based on the Mineral Resource estimate dated December 31, 2019 for Aurizona completed by Equity Exploration. The Mineral Reserve calculation was completed under the supervision of Gordon Zurowski, P.Eng. of AGP Mining Consultants, who is a Qualified Person as defined under NI 43-101. Mineral Reserves are stated within the final design pits based on a $1,350/oz gold price. The cut-off grade used was 0.6 g/t gold for Piaba and Piaba East and 0.41 g/t gold for Boa Esperança. The mining cost averaged $2.32/t mined, processing costs are $9.98/t for laterite/saprolite, $10.28/t for transition and $12.13/t for fresh rock. G&A was $2.84/t ore processed. The ore recoveries were 92.6% for laterite/saprolite, 92.1% for transition and 89.2% for fresh rock. Numbers may not sum due to rounding. See Cautionary Notes. Section 24 of the Aurizona Technical Report includes reference to a preliminary economic assessment (“PEA”) of the potential to development an underground mine at Aurizona. The PEA is preliminary in nature and includes Inferred Mineral Resources that are considered too speculative geologically to have the economic considerations applied to them that would enable them to be categorized as mineral reserves. There is no certainty that the results contemplated in the PEA will be realized.

 

The Castle Mountain Mineral Reserve and Mineral Resource Estimates were disclosed in the "NI 43-101 Technical Report on the Preliminary Feasibility Study for the Castle Mountain Project" prepared by Kappes, Cassiday and Associates with an effective date of July 16, 2018, which is available for download on SEDAR at www.sedar.com. The Mineral Reserve estimate with an effective date of June 29, 2018 is based on the Mineral Resource estimate with an effective date of March 29, 2018 that was prepared by Don Tschabrun, SME RM of Mine Technical Services. The Mineral Reserve was estimated by Global Resource Engineering, LLC with supervision by Terre Lane, MMSA, SME RM. Mineral Reserves are estimated within the final designed pit which is based on the $850/oz pit shell with a gold price of $1,250/oz. The minimum cut-off grade was 0.14 g/t gold and 0.17 g/t gold for Phases 1 and 2, respectively. Average life of mine costs are $1.39/tonne mining, $2.11/tonne processing, and $0.80/tonne processed G&A. The average process recovery was 72.4% for ROM and 94% for Mill/CIL. The Mineral Resource is based on a gold cut-off grade of 0.17 g/t. The Mineral Resource is contained within an LG shell limit using a $1,400 gold price as well as cost and recovery parameters presented in the technical report.