ATERRA Updates Totora Inferred Mineral Resource and Files NI 43-101 Technical Report

(CSE:ATC, OTCQB:CSSCF) ATERRA Metals Inc. announced an updated Inferred Mineral Resource estimate for its Totora Copper-Gold Project in Region III, Chile, with an effective date of October 27, 2026. The updated estimate, prepared by SRK Consulting (Chile) SpA, supersedes the September 24, 2026 estimate and reflects refinements to the conceptual constraints for reasonable prospects for eventual economic extraction (RPEEE). The updated Inferred Mineral Resource totals 150.1 million tonnes grading 0.305% copper and 0.159 g/t gold, or 0.517% copper equivalent (CuEq), at a base-case cut-off grade of 0.20% Cu. Contained metals are 1,009 million pounds of copper and 768.7 thousand troy ounces of gold, equivalent to 1,710.5 million pounds CuEq. The resource comprises the Frontera, Clinton, and Totora-Algarrobilla deposits. The Frontera deposit contains 79.9 Mt at 0.337% Cu and 0.191 g/t Au, Totora-Algarrobilla contains 54.3 Mt at 0.280% Cu and 0.095 g/t Au, and Clinton contains 15.8 Mt at 0.232% Cu and 0.221 g/t Au. The updated estimate reports 6.1% fewer tonnes, 5.5% lower contained copper, and 3.0% lower contained gold compared to the September 24 estimate, with slightly higher average copper and gold grades. The majority of the tonnage loss was from the Totora-Algarrobilla deposit, where 8 million fewer tonnes were reported. The updated conceptual open-pit shells use a copper price of US$6.00/lb and a gold price of US$3,650/oz. Mining costs are US$1.20/t plus US$0.23/t-km transport, processing costs are US$11.30/t processed, G&A is US$0.30/lb sold, selling costs are US$0.418/lb copper and US$5/oz gold, and a 10% discount rate is applied. Underground mining cost is US$8.50/t. The company has closed a $8.355 million financing and intends to commence a 13,000-metre drill program in November 2026, focusing on extensions of the Frontera deposit and Totora mineralized system, as well as infill drilling and metallurgical sampling. A contract has been signed for a magnetotelluric survey to identify potential extensions and new targets. The resource estimate remains classified entirely as Inferred and is subject to confirmation through future test work and various development risks. The independent Qualified Person for the Mineral Resource is Joled Nur, RM CMC, Registration No. 181, of SRK. Sophia Bascuñán, RM CMC, Registration No. 518, of SRK is responsible for geological modelling and data verification. Francisco Bravo, Chief Geologist of ATERRA Metals and a resident of Santiago, Chile, is a qualified person for the remaining technical information. Data verification included site visits, collar verification, and review of core and QA/QC procedures. Drilling included both diamond and reverse-circulation methods, with samples analyzed at AGS Cotecna laboratory in Coquimbo. The Totora Project is located in Chile's Dos Amigos Mining District with access to highway and high-voltage power infrastructure.

ATERRA Metals Announces Closing of $8,355,000 Brokered LIFE Offering

(CSE: ATC) (OTCQB: CSSCF) ATERRA Metals Inc. announced the closing of its previously announced brokered, best-efforts listed issuer financing exemption private placement offering of common shares at a price of $0.06 per common share for aggregate gross proceeds of $8,355,000. The offering was led by Research Capital Corporation as lead agent and sole bookrunner, with Desjardins Capital Markets also acting as agent. The offering was completed under the listed issuer financing exemption pursuant to Part 5A of National Instrument 45-106 and Coordinated Blanket Order 45-935. The common shares issued under this exemption are not subject to resale restrictions under Canadian securities laws. The company intends to use the net proceeds to advance the Phase II exploration program at its Totora Copper-Gold Project in the Dos Amigos Mining District, Region III, Chile, and for general working capital and corporate purposes. In connection with the offering, ATERRA Metals Inc. paid aggregate cash fees of $410,167.90 to the agents and issued an aggregate of 6,669,465 broker warrants. Each broker warrant is exercisable to acquire one common share at the issue price of $0.06 for a period of two years. The broker warrants and the common shares issuable upon exercise are subject to a four-month hold period under Canadian securities laws and Canadian Securities Exchange policies. The Totora Copper-Gold Project comprises the Taruca, Clinton, Frontera, and Sevilla properties and hosts the Frontera, Totora, Algarrobilla, and Clinton copper-gold porphyry systems, along with earlier-stage exploration targets. The company holds its interests in the project under option agreements. Carl Hansen is the CEO of ATERRA Metals Inc. The securities offered have not been and will not be registered under the United States Securities Act of 1933, and may not be offered or sold in the United States or to U.S. persons without registration or an applicable exemption.

ATERRA Metals Announces Upsize of Brokered Life Offering to $8,355,000

(CSE:ATC, OTCQB:CSSCF) ATERRA Metals Inc. has entered into an amended agreement with Research Capital Corporation as lead agent and sole bookrunner, along with Desjardins Capital Markets, to increase the size of its previously announced brokered, best-efforts listed issuer financing exemption private placement offering of common shares at a price of $0.06 per share. The offering will raise a minimum of $4,000,000 and a maximum of $8,355,000 in aggregate gross proceeds. Net proceeds will be used to advance the Phase II exploration program at the Totora Copper-Gold Project in the Dos Amigos Mining District, Region III, Chile, and for general working capital and corporate purposes. On September 24, 2026, ATERRA announced a maiden Inferred Mineral Resource estimate for Totora of 159.8 million tonnes grading 0.51% copper equivalent, comprising 0.30% copper and 0.15 grams per tonne gold, based on a 0.2% copper cutoff grade. The Phase II program is expected to include infill drilling to increase confidence in the current Inferred Mineral Resource, resource expansion drilling, and further evaluation of grassroots exploration targets within the Totora Project area using geophysics and, where warranted, diamond drilling. The company also intends to commence preliminary metallurgical test work as part of Phase II. The common shares will be offered under the listed issuer financing exemption in all provinces of Canada except Quebec, and other qualifying jurisdictions including the United States. Shares offered under this exemption will be immediately free-trading upon closing. The closing of the offering is expected on or about October 14, 2026, subject to all necessary regulatory approvals, including conditional approval of the Canadian Securities Exchange. The agents will receive a cash commission of 6.0% of aggregate gross proceeds up to $6,900,000, reduced to 1.0% for proceeds above that amount, and broker warrants equal to 6.0% of the number of common shares sold up to $6,900,000, with reductions to 3.0% for certain subscribers on a president's list. Each broker warrant entitles the holder to purchase one common share at $0.06 for 24 months following closing. The copper-equivalent grade calculation uses metal prices of US$4.00/lb copper and US$3,650/oz gold, and assumes recoveries of 85% for both metals. Joled Nur, Registered Member of the Comisión Calificadora de Competencias en Recursos y Reservas Mineras (RM CMC), Registration No 181, of SRK, is the independent qualified person for the Inferred Resource. Francisco Bravo, Chief Geologist and resident of Santiago, Chile, is a qualified person as defined by NI 43-101 and has reviewed and approved the scientific and technical information in the release. The Totora Project comprises the Taruca, Clinton, Frontera, and Sevilla properties and hosts the Frontera, Totora, Algarrobilla, and Clinton copper-gold porphyry systems, along with earlier-stage exploration targets. The company holds its interests in the project under option agreements. Carl Hansen is CEO of ATERRA Metals Inc.

ATERRA Metals Reports Maiden Totora Cu-Au Project

(CSE:ATC, OTCQB:CSSCF) ATERRA Metals Inc. announced a maiden Inferred Mineral Resource for its Totora Copper-Gold Project, located in Region III, Chile, approximately 60 kilometres south of Vallenar. The Inferred Resource, estimated by SRK Consulting (Chile) SpA in accordance with CIM Definition Standards and NI 43-101, totals 159.8 million tonnes grading 0.30% copper and 0.15 grams per tonne gold, or 0.51% copper equivalent, at a base-case cut-off grade of 0.20% copper. Contained metals are 1,067.3 million pounds of copper and 792.9 thousand troy ounces of gold, equivalent to 1,790.8 million pounds copper equivalent. The resource comprises four near-surface copper-gold porphyry deposits: Frontera, Totora, Algarrobilla, and Clinton. The project is situated in Chile's Dos Amigos Mining District, near highway and high-voltage power infrastructure. The Totora Project includes the Taruca, Clinton, Frontera, and Sevilla properties. Phase II exploration will focus on testing extensions to the current Inferred Resource, increasing drill density, and obtaining samples for metallurgical testing, as well as examining untested copper-gold targets within the project boundaries. The Frontera deposit contains 81.5 million tonnes grading 0.34% copper and 0.19 g/t gold (0.59% CuEq), with 603.7 million pounds copper, 496.8 thousand ounces gold, and 1,057.0 million pounds copper equivalent. The Totora deposit contains 45.7 million tonnes grading 0.28% copper and 0.10 g/t gold (0.41% CuEq), with 278.3 million pounds copper, 152.2 thousand ounces gold, and 417.2 million pounds copper equivalent. The Algarrobilla deposit contains 16.6 million tonnes grading 0.28% copper and 0.06 g/t gold (0.36% CuEq), with 103.3 million pounds copper, 29.8 thousand ounces gold, and 130.6 million pounds copper equivalent. The Clinton deposit contains 16.0 million tonnes grading 0.23% copper and 0.22 g/t gold (0.53% CuEq), with 82.0 million pounds copper, 114.0 thousand ounces gold, and 186.0 million pounds copper equivalent. The Inferred Resource has an effective date of September 24, 2026, and is classified entirely in the Inferred category. Cut-off grade sensitivity analysis shows that at a 0.15% copper cut-off, the resource contains 271.9 million tonnes grading 0.25% copper and 0.13 g/t gold (0.42% CuEq), with 1,495.1 million pounds copper, 1,136.7 thousand ounces gold, and 2,532.3 million pounds copper equivalent. At a 0.18% copper cut-off, the resource contains 199.3 million tonnes grading 0.28% copper and 0.14 g/t gold (0.47% CuEq), with 1,232.6 million pounds copper, 923.4 thousand ounces gold, and 2,075.2 million pounds copper equivalent. At a 0.25% copper cut-off, the resource contains 100.7 million tonnes grading 0.35% copper and 0.18 g/t gold (0.59% CuEq), with 778.5 million pounds copper, 570.6 thousand ounces gold, and 1,299.2 million pounds copper equivalent. The resource estimate used metal prices of US$4.00 per pound copper and US$3,650 per ounce gold, metallurgical recoveries of 85% for both copper and gold, mining costs of US$1.43 per tonne mined, processing costs of US$11.30 per tonne processed, general and administrative costs of US$2.87 per tonne processed, selling costs of US$5 per ounce gold and US$0.418 per pound copper, and a 10% discount rate. Bulk density was estimated by deposit and mineralization type, with values ranging from 2.45 t/m³ to 2.73 t/m³. The Frontera block model was based on 51 drill holes totaling 16,519.1 metres, Clinton on 17 drill holes totaling 6,412.5 metres, and Totora and Algarrobilla on 64 drill holes totaling 20,729.3 metres. The independent qualified person for the Inferred Resource is Joled Nur, CCCRRM-Chile, of SRK. Carl Hansen is the CEO of ATERRA Metals Inc.

ATERRA Metals Commences Preparation of Maiden Mineral Resource Estimate for the Totora Cu/Au Project

(CSE: ATC, OTCQB: CSSCF) ATERRA Metals Inc. announced that it has commenced preparation of the Company's maiden independent Mineral Resource Estimate ("MRE") for its Totora Cu/Au Project. The MRE will define Totora's initial mineral inventory and establish the technical foundation for future economic studies. ATERRA has engaged SRK Consulting (Chile) SpA to prepare the independent MRE, which will be prepared in accordance with Canadian Securities Administrators' National Instrument 43-101 and will incorporate results from ATERRA's recently completed Phase I drill program and historical drilling. Selected drill highlights include Frontera (AFROD01): 284 metres grading 0.64% CuEq (0.41% Cu & 0.27 g/t Au) from surface, including 180 metres grading 0.71% CuEq (0.48% Cu & 0.28 g/t Au); and Totora (ATOD01): 194 metres grading 0.41% CuEq (0.35% Cu & 0.11 g/t Au) from 254 metres downhole. Copper equivalent grades were estimated using a copper price of US$4.00 per pound and a gold price of US$3,500 per ounce (US$112.53 per gram), with copper and gold recoveries of 85%. The MRE is anticipated to be available for release during September 2026. The estimate will focus on the Company's three principal copper-gold porphyry systems: Frontera, Totora, and Clinton.

ATERRA Reports Totora Cu/Au Project Drilling Returns 284 m Grading 0.64% CuEq Including 180 m at 0.71% CuEq

(CSE: ATC) (OTCQB: CSSCF) ATERRA Metals Inc. reported Phase I drill assay results from its Totora Cu/Au Project in the Dos Amigo Mining District, including AFROD01 returning 284 metres grading 0.64% copper equivalent (CuEq) from surface at the Frontera Cu/Au Deposit. The Phase I drill program comprised a total of 2,745.5 metres of drilling targeting the Frontera Deposit, the advanced Totora Cu/Au porphyry, and early-stage Algarrobilla Cu/Au porphyry. The Frontera Cu/Au Deposit hosts a historical resource estimate of 16 million tonnes indicated grading 0.56% CuEq and a further 34 million tonnes at 0.54% CuEq in the inferred category. On March 26, 2026, ATERRA engaged Research Capital Corporation as a financial advisor for 3 months, issuing a total of 5,750,000 common shares at a deemed price of $0.0314 per share for total deemed consideration of $60,183.34. Copper equivalent grades were estimated using a copper price of US$4.00 per pound and a gold price of US$3,500 per ounce (US$112.53 per gram), with estimated copper and gold recoveries of 85%. The company projects that Phase II drilling at Totora will focus on increasing the dimensions of the known Cu/Au mineralization and infill drilling to increase confidence in the resources. ATERRA's upcoming Phase II drill campaign will also focus on growing Frontera's resources and expanding the current limits of the higher grade Cu/Au core zone.

Commercial Update

(AIM: ATC) ATC Music Group Plc announced a commercial update highlighting recent achievements across its music services platform. The company reported the recent addition of Robbie Williams to its management roster, who has 90 million album sales worldwide, six of the top 100 best-selling albums in British history, and a record-breaking 16 UK number 1 albums. ATC's US managed artist, underscores, secured the main support slot on Charli XCX's US tour and had sold-out solo headline shows in the US. Radiohead, an ATC management and merchandise client, launched its KID A MNESIA exhibition at Coachella and is continuing with a New York residency and dates in Chicago, San Francisco, and Mexico City. The company completed the acquisition of Push in March, which is now integrating into the Group and enhancing direct-to-fan data capture. Joy Entertainment Group delivered a 50,000-capacity sold-out show for Nick Cave in Brighton, and LiveX promoted a week of shows at New York's Radio City Music Hall featuring Joe Hisaishi. The company projects continued rollout of Hamlet Hail to the Thief into other locations around the world.

ATERRA Announces Completion of Totora Phase I Drill Program

(CSE: ATC) (OTCQB: CSSCF) ATERRA Metals Inc. announced the completion of the Totora Cu-Au Project Phase I drill program with a total of 2,745.6 metres of drilling, including 1,571.5 metres of reverse circulation and 1,174.1 metres of diamond drilling. The Totora Cu-Au Project is located within the Dos Amigos Mining District, 60 kilometres south of the City of Vallenar, Region III, Chile, and 15 kilometres south of Tintina Mines' Domeyko Sulfuros Project. The Frontera Cu-Au Deposit hosts historic resources of 16 million indicated tonnes grading 0.56% copper equivalent (0.38% copper and 0.22 grams per tonne gold) and 34 million inferred tonnes grading 0.54% CuEq (0.36% copper and 0.22 grams per tonne gold), based on 16,175 metres of drilling completed in 2013. On March 26, 2026, ATERRA engaged Research Capital Corporation as a financial advisor for 3 months, issuing a total of 5,750,000 common shares at a deemed price of $0.0327 per share for total deemed consideration of $62,674.97, with the second tranche of 1,916,666 shares issued effective May 26, 2026. Upon issuance of the shares to RCC, ATERRA will have 351,874,466 issued and outstanding common shares. The company projects its first Totora Cu-Au Project resource estimate will be available during the third quarter of 2026. Assay laboratories are delayed 4 to 6 weeks due to a significant number of exploration and development programs currently underway in Chile.

ATERRA Mobilizes Diamond Drill Rig to the Totora Cu/Au Project and Announces Grant of Options

ATERRA Metals Inc. (CSE: ATC, OTCQB: CSSCF) announced the mobilization of a diamond drill rig to its Totora Cu/Au Project in Chile to continue the Phase I drill program, with 1,130.0 metres of diamond drilling planned. The company aims to deepen several RC holes and confirm historical RC drill results at the Frontera Cu/Au Deposit, which hosts historic resources of 16 million indicated tonnes grading 0.56% CuEq and 34 million inferred tonnes grading 0.54% CuEq. ATERRA engaged Research Capital Corporation as a financial advisor and will issue 5,750,000 common shares as consideration, with the first tranche of 1,916,666 shares already issued at a deemed price of $0.0327 per share. The company also granted 15,570,000 stock options at an exercise price of $0.05 until April 30, 2028. ATERRA plans to announce a new mineral resource estimate during the third quarter of 2026.

Totora Cu/Au Project Reverse Circulation Drilling Completed and Diamond Drill Rig Being Mobilized

ATERRA Metals Inc. announced the completion of the Phase 1 reverse circulation drilling program on its Totora Cu/Au Project, with a total of 1,575 metres drilled. Some RC holes were stopped early due to water inflow affecting sample collection. These holes will be extended by diamond drilling. The announcement provides an update on the progress of exploration activities. This information is relevant to investors tracking the company's project milestones and drilling results.