Mineral Reserves and Mineral Resources are as defined by the 2014 CIM Definition Standards for Mineral Resources and Mineral Reserves
Mineral Resources are exclusive of Mineral Reserves
Mineral Resources that are not Mineral Reserves do not have demonstrated economic viability
Factors that could materially affect the reported Mineral Resources or Mineral Reserves include; changes in metal price and exchange rate assumptions; changes in local interpretations of mineralization; changes to assumed metallurgical recoveries, mining dilution and recovery; and assumptions as to the continued ability to access the site, retain mineral and surface rights titles, maintain environmental and other regulatory permits, and maintain the social license to operate
Caylloma Mineral Resources and Reserves are estimated as of June 30, 2020 and reported as of December 31, 2020 taking into account production-related depletion for the period through December 31, 2020
Mineral Reserves for the Caylloma Mine are reported above NSR breakeven cut-off values based on underground mining methods including; mechanized (breasting) at US$ 83.37/t; mechanized (enhanced) at US$ 81.66/t; semi-mechanized at US$ 90.19/t; and a conventional method at US$173.74/t; using assumed metal prices of US$21/oz Ag, US$1,600/oz Au, US$2,000/t Pb and US$2,270/t Zn; metallurgical recovery rates of 83% for Ag, 42% for Au, 91% for Pb and 90% for Zn with the exception of the Ramal Piso Carolina vein that uses a metallurgical recovery rate of 75% for Au. Mining, processing and administrative costs used to determine NSR cut-off values were estimated based on actual operating costs incurred from July 2019 through June 2020. Mining recovery is estimated to average 95% with average mining dilution ranging from 13% to 32% depending on the mining methodology. Mineral Resources are reported at an NSR cut-off grade of US$65/t for veins classified as wide (Animas, Animas NE, Nancy, San Cristobal) and US$135/t for veins classified as narrow (all other veins) based on the same parameters used for Mineral Reserves, and a 15% upside in metal prices
Eric Chapman, P. Geo. (APEGBC #36328) is the Qualified Person for Mineral Resources and Amri Sinuhaji (APEGBC #48305) is the Qualified Person for Mineral Reserves, both being employees of Fortuna Silver Mines Inc.