Operational Continuity of Faena Minera Atacama Kozan

Description: OPERATIONAL CONTINUITY TAMBO DE ORO MINING SITE Mining development projects over 5,000 tons/month The Project contemplates extending the useful life of the current site by 7 years and 2 additional months, that is, until December 2028, a period in which the exploitation of the underground mine will increase as a maximum annual average of 15,317 t/month, the above, without modifying the environmentally authorized ore processing rate. Thus, the works that are planned to be built or modified are the following: • Extension of the development of the underground mine, which will extend from elevation ‑290 to -478 and up to elevation +275. A variant of the Bench and Fill (B&F) exploitation method is included in the sector called "Louis vein" of the Underground Mine, called Cut and Fill (C&F). With the above, the extraction rate will increase, which will vary as an annual average between 12,225 t/month (year 2028) and 15,317 t/month (year 2025), maintaining the processing rate at 22,500 t/month, for which the purchase from third parties is proportionally reduced in those months in which the extraction exceeds 15,000 tons/month. • Expansion of the existing Sterile Dump, increasing the area approved for this work, in order to deposit an additional 716,667 m3. • Expansion of the existing Tailings Deposit, increasing the area approved for this work, in order to deposit an additional 751,801 m3, derived from ore processing during the extension of its useful life. • Modification of diversion works. Piping of the existing contour channel and construction of a new contour channel for rainwater associated with the expansion of the tailings deposit and upstream from it. The contour canal will have an approximate length of 390 m, with dimensions of a basal width of 1 m, a depth of 1.75 m and a surface width of 4.5 m. • Relocation of existing facilities inside the site, due to the expansion of the waste dump. These are: witness library, Roman, hazardous waste warehouse (RESPEL), contractor work facilities and the shotcrete plant. • Expansion of the existing concentrate shed in the processing plant area. The rest of the existing works and/or installations in the site area will continue to be used in the previously approved terms, so that their useful life will be extended and they will only be subject to maintenance if required. The objective is to provide operational continuity to the mineral exploitation and treatment process at the Mining Site for seven additional years to that approved by RCA No. 82/2017 and RE No. 20200410133/2020 and, therefore, to all facilities and processes that operate in Tambo de Oro. To do this, the average mineral extraction rate will be increased from 15,000 t/month to a maximum annual average of 15,317 t/month (year 2025). In this sense, the processing capacity of the plant is not modified, maintaining it at 22,500 t/month, an amount that was approved in RCA No. 17/2013, for which the purchase of ore from third parties will be variably reduced. 7,500 t/month environmentally approved.