Technical Study Routine +

Cerro de Pasco Resources Advances Metallurgical Test Program; Evaluates Two-Concentrate Flowsheet for Silver-Bearing Pyrite and Base Metals

Cerro De Pasco’s Quiulacocha tailings pilot yields high silver recovery ahead of the first resource estimate to validate scale.

By The Northwire Desk — AI Analysis Jun 09, 2026 · 09:44 CDPR · 0.53 Cerro De Pasco Resources Inc.

Executive Summary

The June 9, 2026 release details metallurgical test results for the Quiulacocha Tailings Reprocessing Project in Peru.
Testing supports a conceptual two-concentrate flowsheet targeting a high-grade pyrite concentrate and a base metal concentrate, both carrying silver.
Mini-pilot results demonstrate >92.5% total sulphide recovery and ~94% silver recovery into a bulk concentrate.
Pyrite represents >50% of the tailings, positioning the project to potentially supply an alternative sulphur-bearing feedstock for industrial markets.
Bench-scale recovery ranges include 87–95% Ag, 93–99% pyrite, 62–82% Zn, and 60–78% Pb.
Head grades from selected composites show Ag at 44.65–55.62 g/t, Zn at 1.13–1.65%, and Pb at 0.35–1.14%.
Exploratory work is underway to concentrate gallium from silicate gangue and indium from base metals/pyrite streams, with a consolidated update expected in H2 2026.
Next steps include mini-plant optimization, Phase 2 drilling, and the anticipated first NI 43-101 Mineral Resource Estimate.

Material Impact

The company has systematically advanced from FY2025 earnings and the sale of the non-core Santander mine (Apr 2025) to a $22.7M financing led by Eric Sprott (Nov 2025), followed by a DFC development funding agreement (Mar 2026) and an AMSAC surface-access agreement (Mar 2026).
The June 2026 metallurgical results validate the technical feasibility of the proposed flowsheet, confirming that silver and sulphides can be effectively recovered into a bulk concentrate.
This progress de-risks the technical path and aligns with the company's stated milestones, but it is an incremental follow-up to previous announcements rather than a market-moving event.
The stock has traded in a $0.50–$0.65 range since May 2026, indicating that the market views this as routine project development. Without a formal resource estimate or production guidance, the financial impact remains speculative.
The news is Routine - Positive. It confirms execution capability but does not alter the valuation model until resource definition and permitting milestones are met.

CDPR · Price

Company Overview

Cerro de Pasco Resources Inc. trades on the TSX Venture (CDPR) and OTCQX (GPPRF).
Flagship asset: Quiulacocha Tailings Reprocessing Project, located in the Pasco Region of Peru.
Secondary asset: Excelsior Stockpile at the El Metalurgista Concession, holding a 30.1 Mt Inferred Mineral Resource.
Project stage: Exploration/Feasibility. No established NI 43-101 resource exists for Quiulacocha.
Extraction method involves tailings reprocessing via excavation, wet pumping, and hauling, with estimated costs of $1–$2 per ton.
Target commodities include silver, zinc, lead, copper, gold, gallium, and indium.

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