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Bonterra Intersects 2.23 g/t Au over 8.2 m, Including 9.26 g/t Au over 1.7 m on its 100% owned Desmaraisville South Project

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Bonterra Intersects 2.23 g/t Au over 8.2 m, Including 9.26 g/t Au over 1.7 m on its 100% owned Desmaraisville South Project






Bonterra Resources Inc. (TSX-V: BTR) (OTCQX: BONXF) (FSE: 9BR2) is pleased to announce the latest results from its 15,000 meters drill program at its 100% owned Desmaraisville South project. The purpose of the program was to test several new geological and geophysical targets along with historical near surface gold mineralization along the edges of the O’Brien Syenite Intrusion and to identify the location of two regional corridors of deformation located further to the North of the project.


The diamond drilling was conducted within seven kilometers of the Bachelor Mill Complex. To date, Bonterra has received the assay results from 10,631 samples including QA-QC samples from the 57 diamond drill holes completed between August 23 and December 22, 2023. Assay results from 3,708 drill core samples are still pending. Please refer to press releases dated December 4 and December 14, 2023, for exploration updates on the Desmaraisville South project and the surrounding area.


Highlights Include:

  • 2.23 g/t Au over 8.2 m, including 9.26 g/t Au over 1.7 m in hole BRDS-23-021
  • 15.30 g/t Au over 1.0 m in hole BRDS-23-030
  • 0.80 g/t Au over 11.7 m, including 2.84 g/t Au over 1.4 m in hole BRDS-23-013
  • 3.66 g/t Au over 1.5 m in hole BRDS-23-004A


Marc-André Pelletier, President and CEO commented: “With the launch of the $10 million in exploration drilling as part of the Option Agreement with Osisko Mining on the Phoenix JV and positive results from the 2023 campaign at our 100%-owned Desmaraisville property, this year holds transformative potential for Bonterra. Notably, all drill hole mineralized intersections at Desmaraisville fall within 4 km of the Bachelor Mill Complex. The discovery of a new mineralization type on the east side of the O’Brien Intrusive in hole BRDS 23-021, distinct from the mineralization typically found at the Bachelor-Moroy deposits, underscores the possibility of new findings on the Desmaraisville property. Compilation work is ongoing, and the final interpretation of the 2023 geophysical surveys are expected soon. These findings will contribute to generating highly prospective drill targets for exploration later this year.”


Highlights of the Diamond Drilling Results:


The diamond drilling program at the Desmaraisville South project had several objectives. The main objectives were to intersect gold mineralization; (1) on the eastern side of the O’Brien Intrusive, (2) along the extensions of various gold zones discovered in 2015 south of the O’Brien Intrusive, (3) related to geophysical targets on the west of the Bachelor Lake felsic intrusion enhanced by the presence of gold showings at surface and finally, (4) to test the deep southwest plunge of a zinc, lead, and silver mineralized body of the former Coniagas Mine (Figures 1 and 2).


In addition, drill holes were positioned to improve the understanding of the stratigraphy on the property and to better position the boundaries of the various formations within it. The Company is also seeking to better locate two major structures that affect these formations: the Opawica-Guercheville deformation corridor, which hosts numerous gold showings and deposits that have been the subject of historical resource calculations, and the Lamarck-Wedding Fault, host to the former Shortt Lake Gold Mine. Recent geophysical surveys on the Desmaraisville property should help Bonterra to properly position these two major structures.


Figure 1- Desmaraisville South Property – Surface plan view with drilling locations

The gold mineralized zone containing 2.23 g/t Au over 8.2 m, including 9.26 g/t Au over 1.7 m in hole BRDS-23-021 (Figures 2 and 3) is located at the contact between a tuff and a massive basalt rock unit. The contact zone is moderately silicified and contains 2-3% pyrite in clusters. This type of gold-bearing environment is different from the Bachelor and Moroy gold-bearing environment. This new mineralized zone appears to be related to a structural lineament trending N080 to N070 and this lineament is more than one km in length. Borehole BRDS-23-030 (Figure 2) is more than 275 m deep and has intersected an atypical gold mineralization characterized by a strong epidote alteration with a low sulphide content. The best mineralized interval returned a value of 15.30 g/t Au over 1.0m.


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

Figure 3 – Plan View of the East Area of the O’Brien Intrusive: Drill Hole BRDS-23-021

Drill hole BRDS-23-013 (Figure 4) intersected a gold enriched zone (0.80 g/t Au over 11.7 m, including 2.84 g/t Au over 1.4 m) associated with a strongly altered felsic dike west of the Bachelor Lake Intrusive. The host rocks directly in contact with the dike are strongly silicified. It remains to be determined whether the IP geophysical anomaly is related to this mineralized zone and if so, the mineralized zone could extend for several hundred metres.


Figure 4 – Plan View of the Bachelor Lake Intrusive – Drilling of IP Geophysical and Surface Gold Anomalies


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


Hole ID Easting Northing Elevation (m) Azimuth Dip Length (m)
BRDS-23-004A 418340 5484338 341 15 -45 366
BRDS-23-013 418391 5485945 318 180 -50 330
BRDS-23-021 418092 5483268 343 160 -45 414
BRDS-23-029 417278 5483836 324 360 -48 309
BRDS-23-030 416942 5482609 333 128 -63 309
BRDS-23-043 417114 5482877 331 165 -45 318
BRDS-23-051 417734 5483601 340 360 -50 309

UTM Coordinates, System: NAD83 Zone 18N


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


Hole ID Including From (m) To (m) Length (m) Grade (Au g/t) Metal Factor (length x grade)
BRDS-23-004A 112.2 113.7 1.5 3.66 5.5
BRDS-23-013 178.1 189.8 11.7 0.80 9.3
Including 178.1 179.5 1.4 2.84 4.0
BRDS-23-021 130.3 138.5 8.2 2.23 18.3
Including 130.3 132 1.7 9.26 15.7
BRDS-23-029 157 158 1.0 5.39 5.4
BRDS-23-030 302 303 1.0 15.30 15.3
BRDS-23-043 24 26 2.0 1.48 3.0
BRDS-23-043 257.3 259.5 2.2 1.49 3.3
BRDS-23-051 253.5 256 2.5 1.44 3.6
Including 254 255.3 1.3 2.48 3.2

1) The meterage represents the drilled lengths. More drilling will be required to estimate true widths.

2) All of the above mineralized intersections are uncut.

3) All of the above results have an Au grade greater than 0.5 g/t Au and a Metal Factor greater than 3.0.


Quality Control and Reporting Protocols


The Desmaraisville project’s drill core gold analyses are performed at Activation Laboratories located in Ste-Germaine-Boulé, Quebec, and at the Agat Laboratory located in Val d’Or, Quebec. The external laboratories employ 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 drilling program a total of 12,179 drill core samples and 2,160 QA-QC samples, have been sent to Actlabs and Agat.


Qualified Person


  1. Donald Trudel, P.Geo. (OGQ # 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 1.24 million ounces in Measured and Indicated categories and 1.78 million ounces in the Inferred category.


In November 2023, the Company entered into a earn-in and joint venture agreement with Osisko Mining Inc. for the Urban-Barry properties, which include the Gladiator and Barry deposits. Over the next three years, Osisko can earn a 70% interest by incurring $30 million in work expenditures. This strategic transaction highlights Bonterra’s dedication to advancing its exploration assets, marking a significant step towards development.


Posted February 5, 2024

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