The CPR for the Serrote mine states that the mining rate averages approximately 30,000 tonnes per day at a strip ratio of 1.7:1. The processing facility has a capacity of 11,000 tonnes per day and uses conventional crushing, grinding and flotation to produce a copper concentrate containing by-product gold. Life of mine copper production is expected to average approximately 44 million pounds per year at an approximate 85% recovery rate and all-in sustaining cost (“AISC”) of approximately $1.85 per pound4. Gold recovery is targeted at 65% and gold accounts for approximately 7% of the expected revenue from the Serrote mine4.
Santa Rita Mine
Santa Rita is an open pit nickel sulphide mine located in Bahia State, Brazil, approximately 600 kilometers south of Serrote and is owned by Atlantic Nickel (“ATN”), a wholly-owned Appian affiliate. The mine is supported by grid power, paved road access, water supply from the De Contas River, and the nearby port of Ilhéus.
The Santa Rita deposit was discovered in 1976 with various companies carrying out work until production commenced in 2009. Operations were placed on care and maintenance by the previous owner in 2015 due to several factors including low metal prices. Appian acquired the mine in 2018 and following an optimization of the open pit mine plan and refurbishment of the processing plant, first concentrate was shipped in early 2020.
The CPR for the Santa Rita mine states that, as of December 2022, open pit Proven and Probable Reserves at Santa Rita consisted of approximately 34.8 million tonnes at a nickel sulphide grade of 0.31% and copper grade of 0.11%, and Measured and Indicated Resources (inclusive of Reserves) consisted of approximately 43.4 million tonnes at a nickel sulphide grade of 0.33% and copper grade of 0.12%. The open pit reserve is expected to support production until 2028.
The CPR presents a PEA on the underground potential at the Santa Rita mine. The underground inventory consists of an Indicated Resource of 105.8 million tonnes at a nickel sulfide grade of 0.54% and copper grade of 0.18%, along with a 130.9 million tonne Inferred Resource with comparable grades. The PEA contemplates mining approximately 141.7 million tonnes of the underground resource over a 27-year mine life using the sub-level caving mining method. An infill drill program and prefeasibility study on the underground project are currently underway.
Additional exploration potential includes open pit and underground targets identified at the existing Santa Rita mine as well as on a 46,000 hectare regional exploration portfolio. The most advanced of these targets is the Palestina project located approximately 25 kilometers from the Santa Rita processing plant. Work is currently underway to evaluate the potential to truck ore from Palestina to the Santa Rita plant to provide additional open pit feed during the transition from open pit mining to underground at the Santa Rita mine.
The CPR for the Santa Rita mine states that the current operations consist of open pit mining at a rate of 70,000 tonnes per day at a strip ratio of 2.8:1. The processing facility capacity is 17,800 tonnes per day and uses crushing, grinding and flotation to produce a nickel sulphide concentrate with by-product copper, cobalt, platinum, palladium, and gold. Nickel recovery is expected to range from approximately 82% to 85% over the open pit and underground mine life, respectively. Copper recovery is targeted at 75%. The open pit is expected to recover an average of 32 million pounds of nickel per year at an AISC of $5.26 per pound of nickel over the mine life5. The projected revenue over the open pit mine life is approximately 84% nickel, 9% copper and 2% cobalt, with the remaining 5% from platinum, palladium, and gold5.
Background on ACG
ACG is a special purpose acquisition company looking to benefit from favorable price conditions for new economy metals and other mining materials. On October 12, 2022, ACG raised proceeds of approximately $125 million in its initial public offering and listed on the London Stock Exchange.
Upon closing of the ACG transaction with Appian to acquire the Appian entities that own the Serrote and Santa Rita mines, ACG will be renamed ACG Electric Metals Limited. ACG Electric Metals will continue to be led by its Chief Executive Officer, Artem Volynets, and its Chief Financial Officer, Carole Whittall. Responsibility for the operation of the mines in Brazil will continue to be held by Paulo Castellari-Porchia and Milson Mundim, each an employee of Appian. Following completion of the ACG transaction with Appian, the full operating team in Brazil will join ACG Electric Metals.
4 Assumes copper prices of $3.55/lb in 2023, $3.82/lb in 2024, $3.94/lb in 2025, $3.89/lb in 2026 and $3.59/lb thereafter; gold prices of $1,753/oz in 2023, $1,719/oz in 2024, $1,654/oz in 2025, $1,593/oz in 2026 and $1,615/oz thereafter; and US$/R$ exchange rate of 5.39 in 2023, 5.44 in 2024, 5.66 in 2025 and 5.55 thereafter, as disclosed in the CPR.
5 Assumes nickel prices of $9.87/lb in 2023, $9.46/lb in 2024, $9.61/lb in 2025, $9.13/lb in 2026 and $8.46/lb thereafter; copper prices of $3.55/lb in 2023, $3.82/lb in 2024, $3.94/lb in 2025, $3.89/lb in 2026 and $3.59/lb thereafter; cobalt prices of $25.58/lb in 2023, $27.70/lb in 2024, $27.37/lb in 2025, $26.43/lb in 2026 and $23.53/lb thereafter; gold prices of $1,753/oz in 2023, $1,719/oz in 2024, $1,654/oz in 2025, $1,593/oz in 2026 and $1,615/oz thereafter; platinum prices of $1,027/lb in 2023, $1,099/oz in 2024, $1,121/oz in 2025, $1,195/oz in 2026 and $1,140/oz thereafter; palladium prices of $1,977/oz in 2023, $1,763/oz in 2024, $1,544 in 2025, $1,325 in 2026 and $1,363/oz thereafter; and US$/R$ exchange rate of 5.39 in 2023, 5.44 in 2024, 5.66 in 2025 and 5.55 thereafter, as disclosed in the CPR.