Compass Reports Strong Gold Recoveries from Recent Metallurgical Testing at Massala

Phase 1 of Resource Definition Diamond Drilling Program is Complete

Toronto, Ontario--(Newsfile Corp. - June 1, 2026) - Compass Gold Corp. (TSXV: CVB) (Compass or the Company) is pleased to announce robust results from its inaugural metallurgical test program on bulk excavation samples as well as the completion of the first phase of resource definition diamond drilling at the Massala prospect, located on the Company's Sikasso Property in Southern Mali (Figure 1).

Highlights

• Metallurgical testing in two samples (MA-1 and MA-5) by Blue Coast Research indicates gravity recoverable gold content varied from 51.1% to 61.0%

• A final gold recovery of 95.3% was achieved on sample MA-5, using bottle roll leaching, with optimal recovery between 24- and 48-hours

• The gold content is characterized as moderate-to-fine-grained and free-milling, pointing toward a conventional, straightforward milling flowsheet

• Completion of Phase 1 resource definition diamond drilling (42 holes, 1457 metres) at the Massala Small Mine Permit application area:

  • *Visible gold present (>100 g/t Au from 34.5 m) in one of the first 3 holes

  • Assays from 39 more holes are pending

• Compass appoints Vice President, Corporate Affairs

(*See Compass news release dated May 21, 2026.)

Compass CEO, Larry Phillips, said, "These extremely positive independent metallurgical results confirm that the gold mineralization at Massala is highly amenable to standard, low-cost recovery methods. Sample MA-5 gave us a gravity gold recovery of 61.0% and a corresponding bottle roll leaching recovery of 95.3%. These robust results significantly de-risk our processing flowsheet as we advance our Small Mine strategy. These results will be used to support the advancement of the Massala project toward near-term commercial production and scaling.

Phase 1 drilling has concluded, and 1,024 core samples have been dispatched to the SGS assay laboratory in Burkina Faso. Our initial assay results contained high-grade intervals, and we eagerly await the results of the remaining assays."

Dr. Madani Diallo, Director and Country Manager, added: "I am pleased to report that we have completed Phase 1 of the drilling program on schedule despite some operational and weather challenges. The field team has worked long hours to complete a safe and efficient drilling program and they have now shut down and secured the site for the coming rainy season.

Meanwhile, the assay results of only the first three holes have been very exciting. I would like to see more high-grade assays from the remaining 39 holes when they come in as we advance toward building our first Small Mine at Massala."

Metallurgical Test Work and Results

As previously reported (see Compass announcements Jan. 26, Mar. 31, and Apr. 2, 2026) a comprehensive metallurgical study was executed by Blue Coast Research Ltd. (Blue Coast) on two samples from the Massala prospect at their advanced metallurgical testing facility in Parksville, British Columbia, under the supervision of Alexandria S. Hall, P.Eng.

Samples were tested for head assay characterization, with two samples (MA-1 and MA-5), returning 0.65 g/t Au and 2.24 g/t Au, respectively (Table 1). An additional four samples returned low gold concentrations that were not suitable for additional testing.

Extended Gravity Recoverable Gold (EGRG) testing on these samples (MA-1 and MA-5) measured gold recoveries of 51% and 61%, respectively, with two-thirds of the recoverable gold collected in stage one (grinding to

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