Sigma Lithium Corporation is increasing its Proven and Probable Reserve balance by 40% to 77.0 million tonnes from 54.8 million tonnes. The entirety of this mineral Reserve balance is feasible through low-cost, open pit, mining operations, consolidating the Company's position as a low-cost producer of Quintuple Zero High Purity Lithium materials. The increased mineral Reserve balance enables meaningful opportunities for continued low-cost lithium production growth at Sigma Lithium's Grota do Cirilo operations by supporting a third and potentially fourth processing facility, or a longer operating life at the Company's currently planned lithium throughput.

As the available balances show consistent minerology and are available through open pit mining operations, the Company expects to maintain its current, Phase 1, low operating cost model as it expands into additional phases. This increase in mineral Reserves does not represent the full extent of the conversion of mineral Resources as announced by the Company on January 31, 2024. Sigma Lithium continues to execute the mineral and geological development work in order to further convert its Resources into Reserves over time.