Sigma Lithium Resources Corporation announced exceptional results of metallurgical tests ("Met Tests") performed to evaluate, among other parameters, the recovery of lithium from the Barreiro deposit proposed to be developed in Phase 2 of the Company's Grota do Cirilo Project (the "Project"). The Met Tests included a heavy liquid separation ("HLS") test to evaluate the extent to which a gravity-based separation process, or dense media separation ("DMS"), could successfully recover the lithium from the spodumene ore. HLS test work done on ore sizes of 6.3mm and 10mm achieved excellent lithium recoveries of 70.2 % and 66.1%, respectively, producing a 6% Li2O battery-grade spodumene concentrate within the high levels of specifications demanded by the chemical lithium market without the use of flotation or hazardous chemical reagents, such as sulphuric acid, in the concentration process. This is consistent with Sigma's intention to continue to process its lithium ore in a "green" environmentally-friendly and sustainable manner. The Met Tests results will be used to support the study currently underway to update the technical report titled "Grota do Cirilo Lithium Project, Araçuaí and Itinga Regions, Minas Gerais, Brazil, National Instrument 43-101 Technical Report on Feasibility Study Final Report", dated October 18, 2019 (the "Feasibility Study Report"). As detailed in its news release of December 7, 2020, the Company commissioned SGS Canada Inc. to update the Feasibility Study Report to include the mining and processing of ore from the Barreiro deposit with the objective of doubling the Company's planned production capacity of high-purity "green & sustainable" 6% Li2O battery- grade spodumene concentrate to 440,000tpy in Phase 2 of the Project. The Company is in pre-construction phase (including the EPC and "contract-readiness" of core construction suppliers) of its larger-scale lithium concentration commercial production plant (the "Production Plant").