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Bonterra Intersects 10.97 g/t Au over 10.1 m, including 16.36 g/t Au over 4.7 m on its 100% owned Desmaraisville South Project

Press Release

Val-d’Or, QC – December 4, 2023 – Bonterra Resources Inc. (TSX-V: BTR, OTCQX: BONXF, FSE: 9BR2) (“Bonterra” or the “Company”) is pleased to announce the first drill results of its 15,000 meters (“m”) drill program at its Desmaraisville South project. Three diamond drill rigs have been mobilized on the project and are currently drill-testing several new geological and geophysical targets along with historical near surface gold mineralization along the edges of the O’Brien Syenite Intrusion (“O’Brien Intrusive”).

Located within three kilometers (“km”) of the Bachelor Mill Complex, three different areas were drill tested for their near surface gold potential. These areas are located North, East, and South of the O’Brien Intrusive (Figure 1).

At the Southern Area (“South Area”), several new drill targets were generated from the reinterpretation of previously intersected gold bearing structures. This reinterpretation was done with the use of the Bonterra drill hole database and the historical 3D models of high-grade gold intercepts drilled previously. Bonterra has drilled to date a total of 17 diamond drill holes (4,332 m) at the South Area (Figure 2 and Table 1).
Highlights include:

  • 10.97 g/t Au over 10.1 m, including 16.36 g/t Au over 4.7 m in hole BRDS-23-018
  • 4.79 g/t Au over 6.3 m, including 9.03 g/t Au over 1.5 m in hole BRDS-23-016
  • 2.65 g/t Au over 4.2 m in hole BRDS-23-016

Marc-André Pelletier, President and CEO commented: “After entering into an earn-in and joint venture agreement with Osisko Mining Inc. in the Urban-Barry camp, our Company has redirected its exploration efforts to focus on our 100%-owned Desmaraisville projects, which is close to where the Bachelor Mill Complex is situated. The current 15,000 m drill program aims to explore new targets across our land package and validate our improved geological interpretation. The recent discovery of mineralized zones at Desmaraisville South supports our current understanding of the gold potential, indicating similarities to the Bachelor and Moroy deposits on the western side of the O’Brien Intrusive, located about 3 km from the Bachelor Mill. The ongoing drill program with three rigs, set to conclude this year, should provide valuable insights that will guide our future exploration strategy. It is to be noted that the nearby Bachelor Mine historically produced over 350,000 ounces of gold from two million tonnes at a grade of 5.0 g/t Au.”

The drilling encountered several sub-parallel hematite and silica rich altered zones with trace to 8% fine grained and disseminated pyrite which host the gold mineralization (Table 2 and Figure 2). From hole to hole, these mineralized zones show various orientations and suggest that the gold mineralization is related to a large complex with brittle zones of various orientations and plunges. Many assays are still pending from the 3,955 submitted samples.

Bonterra’s review of the historical database demonstrated a lack of systematic sampling. Several gold mineralized intervals were not sampled above and below the mineralization. Bonterra will conduct a re-sampling program in early 2024. When all analytical data is received, Bonterra will update its 3D model including the geology, alteration, structures, and mineralization to better understand and evaluate the near surface gold potential of the South Area.

Table 1: Drill Hole Locations — Desmaraisville South project, Quebec

Table 2: Significant Mineralized Intersections from Drilling on the Desmaraisville South project, South Area

Figure 1 — Plan View of the O’Brien Intrusive with Areas of Drilling

Figure 2 — Plan View of the South Area of the O’Brien Intrusive with Best Results

Quality Control and Reporting Protocols

The Desmaraisville project’s drill core gold analyses are performed at Activation Laboratories (Actlabs) located in Ste-Germaine-Boulé and Val d’Or, Quebec and at the Agat Laboratory in Val d’Or. The external laboratory employs a rigorous QA-QC analysis program that meets industry standards. The analyses are carried out by fire assay (A.A.) with atomic absorption finish and with gravimetric finish for assay above 10 g/t Au at both Actlabs and Agat. Blanks, duplicates, and certified reference standards are inserted into the sample stream to monitor the Laboratory’s performance. The Company’s QA-QC program requires that at least 5 to 10% of the samples be analyzed by an independent laboratory. These verification samples are sent to ALS Minerals laboratory facility located in Val-d’Or, Quebec. The verifications show a high degree of correlation with the Laboratory’s results. For the South Area, a total of 3,955 drill core samples and 702 QA-QC samples, have been sent to Activation Laboratories Ltd and Agat Laboratory.

Qualified Person

M. Donald Trudel, P.Geo. (OGQ # 813), Director Geology for the Company, oversees all exploration activities on the Desmaraisville South Project and has compiled and approved the information contained in this press release.


Marc-André Pelletier, President & CEO

2872 Sullivan Road, Suite 2, Val d’Or, Quebec J9P 0B9
819-279-9304 | Website:



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