Mr. Marc-Andre Pelletier reports

BONTERRA ANNOUNCES 2026 EXPLORATION PLANS AT ITS 100% OWNED DESMARAISVILLE SOUTH PROJECT

Bonterra Resources Inc. has presented its 2026 exploration plans at its 100-per-cent-owned Desmaraisville South project. Bonterra is planning a 10,000- to 12,000-metre (m) diamond drill program starting mid-April and followed by other exploration programs to be completed by year-end.

Marc-Andre Pelletier, president and chief executive officer, commented: "At our 100-per-cent-owned Desmaraisville South project, the 2026 exploration program is designed, among other objectives, to test deep targets on the eastern side of the O'Brien intrusive, which hosts the Bachelor and Moroy deposits. Additional targets will also be evaluated near the Bachelor mill, the only fully permitted processing facility in the region. The recent update to the mineral resource estimates for the Bachelor and Moroy deposits, together with the 2026 exploration campaign, underscores the company's commitment to advancing the Desmaraisville project toward a mining restart while maximizing the use of its existing permitted infrastructure."

2026 exploration plans

• Drill 10,000 to 12,000 m near the Bachelor mill complex, including the Mistik 13 zone, the Hewfran zone, the deep drilling targets adjacent to the O'Brien intrusive on the east, the Cere, and Murgor showings to the south and other targets.
• Carry out fieldwork, focusing on mapping and rock geochemical sampling.
• Conduct a resampling program on the historic Hewfran, Bachelor and Moroy drill core.
• Complete a 3-D inversion model with geological constraints of the 2023 gravimetric geophysical survey.
• Further advance the permitting process at the comex to increase throughput at the Bachelor mill and expand the capacity of the tailings management area.

O'Brien intrusive deep drilling target

The company is planning a deep drilling program to test potential gold targets around the O'Brien intrusive, which hosts the Bachelor and Moroy deposits on the Western side. The program aims to evaluate potential of new gold mineralization on the eastern side of the intrusive, with drilling targeting an approximate vertical depth of 900 m.

Highlights of the fieldwork and resampling program

Fieldwork at Desmaraisville South will begin this summer to better evaluate high-grade gold showings located within the Opawica-Guercheville and Wedding-Lamarck corridor of deformation. This program will also complete the evaluation of 1) near-surface gold-bearing structures, 2) low-gravity anomalies which may be related to felsic intrusions and 3) the resampled historical trenches.

A relogging and sampling program is planned for all historical drill core from the Hewfran, Bachelor and Moroy deposits. This program will include an adequate sampling of intervals with economic grades that have not been sampled previously.

Laurentia Exploration based in Jonquiere, Que., has been contracted to carry out a metallogenic and structural study on the Desmaraisville South property. The objective of this study is to better define the structural controls of gold mineralization on known deposits and ultimately to improve the quality of the company's future drill targets.

Sander Geophysics based in Ottawa, Ont., was commissioned to generate a 3-D inversion model of 2023 gravimetric data to model three-dimensional volumes that could correspond to late intrusions such as the O'Brien intrusion which hosts the Bachelor and Moroy deposits.

LithologIQ based in Montreal, Que., has been mandated to process 20,000 m of drill core using their hyperspectral core scanning technology. Historic and recent drill core from all gold mineralized environments at the project will be scanned directly at the mine site. The recognition of minerals associated with gold-bearing environments will allow for the rapid identification of new areas with high potential during a drilling campaign.

Qualified person

M. Donald Trudel, PGeo (OGQ No. 813), director geology for the company, oversees all exploration activities on the Desmaraisville property and has compiled and approved the information contained in this press release. Mr. Trudel is a qualified person as defined by National Instrument 43-101 on standards of disclosure for mineral projects.

About Bonterra Resources Inc.

Bonterra is a Canadian gold exploration company with a portfolio of advanced exploration assets anchored by a central milling facility in Quebec, Canada. The company's assets include the Gladiator, Barry, Moroy and Bachelor gold deposits, which collectively hold 16.8 million tonnes (Mt) at an average grade of 3.02 grams per tonne Au (gold) for 1.63 million ounces (Moz) of measured and indicated mineral resources, plus 15.6 Mt (million tonnes) at 4.32 g/t Au for 2.17 Moz of inferred mineral resources.

In November, 2023, the company entered into an earn-in and joint venture agreement with Osisko Mining Inc. for the Urban-Barry properties (the JV agreement), which include the Gladiator and Barry deposits. In October, 2024, Gold Fields Ltd., through a wholly owned Canadian subsidiary, completed the acquisition of Osisko Mining for $2.16-billion. Gold Fields is now the counterparty to the JV agreement and can continue to earn a 70-per-cent interest in the joint venture by incurring $30-million in work expenditures on or before November, 2026 (including expenditures incurred by Osisko Mining prior to October, 2024). This strategic transaction highlights Bonterra's dedication to advancing its exploration assets, marking a significant step toward development.

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