Cerro de Pasco evaluates two-concentrate flowsheet for silver-bearing pyrite

MONTRÉAL, June 09, 2026 (GLOBE NEWSWIRE) -- Cerro de Pasco Resources Inc. (TSXV: CDPR | OTCQX: CDPMF | BVL: CDPR (Lima) | FRA: N8HP) ("CDPR" or the "Company") is pleased to provide an update on the status of the integrated metallurgical test program advancing the Quiulacocha Tailings Reprocessing Project in central Peru. The results obtained to date, across multiple laboratories and over 110 individual tests, support a directional path toward a two-concentrate flowsheet, each concentrate carrying silver, and show strong metallurgical responsiveness of the Phase 1 Quiulacocha tailings samples to conventional and emerging flotation technologies. Highlights: Conceptual flowsheet with Two Concentrate Streams: Metallurgical testing in bench-scale and mini-pilot programs has converged on a conceptual flowsheet generating a high-grade pyrite concentrate and a base metal concentrate, both containing silver (see Figure 1 below).

Pyrite concentrate stream under evaluation: With pyrite representing more than 50% of the Quiulacocha tailings portion drilled in 2024, the Company is investigating a pyrite concentrate stream as an alternative source of sulphur for essential industries such as phosphate-based fertilizers and chemical reagents used in critical-metal processing. Strong silver and sulphide recovery at bench-scale and mini-pilot testing: In the mini-pilot plant to date, greater than 92.5% of total sulphides and approximately 94% of silver (lattice-bound and discrete) were recovered into a bulk concentrate, together with the associated base-metal sulphides. Low sulphide tailings: Importantly, the final tails are targeted to contain low residual sulphur, which test results indicate may reduce acid-generation potential — a key objective of the Company's remediation strategy, subject to further test work.

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