Oroco Continues South Zone Success

Oroco Resource Corp. (OCO) has released the fourth batch of Phase 2 assay results from the South Zone of its Santo Tomás porphyry copper project in Sinaloa, Mexico. The data covers drill holes S035 through S044.

Key reported intercepts include: - S035: 57.4 m grading 0.72% CuEq from 108 m downhole. - S039: 103 m grading 0.58% CuEq from 98 m downhole. - S040: 154 m grading 0.51% CuEq from 131 m downhole, followed by 14 m grading 0.83% CuEq from 287 m. - S042: 369.3 m from surface grading 0.45% CuEq. - S041: 211.7 m grading 0.32% CuEq from 73.5 m and 249.7 m grading 0.36% CuEq from 289.3 m.

Holes S038 and S041 ended in mineralization approximately 200 m and 90 m, respectively, below the current PEA pit limits, suggesting potential resource expansion at depth.

Phase 2 has completed 42 holes totaling 12,649.3 m drilled, with three rigs operating and drilling now commencing in the Pillar Zone between the North and South Zones. The release also highlights Geopyörä geometallurgical testing suggesting South Zone mill feed may require reduced comminution energy relative to the 2024 PEA estimate.

Oroco Resource Corp. (OCO) is an advanced-stage developer with a Preliminary Economic Assessment (PEA) and a large resource base, rather than a grassroots discovery. The company’s Phase 2 program is designed to convert Inferred resources to Indicated resources and support a Preliminary Feasibility Study (PFS), rather than to test a new system.

Against the equity, the company has a market capitalization near C$160 million, an existing 1.07 billion-tonne resource, and a US$1.48 billion after-tax NPV8% PEA. Infill holes at or slightly above resource grade do not materially change the equity story.

The stock re-rated from about C$0.38 in early August to C$0.54 by late August following the August 6 high-grade hole S033, which returned 26.48 meters at 1.18% CuEq. Today’s release lacks a comparable high-grade intercept and instead delivers longer, lower-grade infill results.

Because these are primarily infill and resource-definition holes, the relevant anchor is the resource grade, not the prior headline gram-metres. Against that anchor, the results are confirmatory to mildly positive, with depth extensions below the PEA pit providing modest upside.

There is no new financial data in this release. Prior-period context shows the company reported a nine-month operating loss of C$4.19 million and held C$18.8 million in cash as of February 28, 2026, after closing a C$23 million bought deal in January 2026.

The release is materially new only in confirming the resource model and hinting at depth expansion.

Oroco Resource Corp. is a Vancouver-based pre-revenue mineral exploration and development company advancing the Santo Tomás porphyry copper project in Sinaloa, Mexico. The company holds an 88.5% net interest in the 1,173-hectare Core Concessions and an 80% interest in surrounding concessions, with a broader project area spanning approximately 6,121 hectares.

A mineral resource estimate completed in August 2024 by SRK reported an Indicated resource of 540.6 million tonnes at 0.33% copper, 0.008% molybdenum, 0.028 grams per tonne gold, and 2.1 grams per tonne silver. The Inferred resource stands at 530.3 million tonnes at 0.31% copper, 0.007% molybdenum, 0.023 grams per tonne gold, and 1.9 grams per tonne silver.

An preliminary economic assessment conducted by Ausenco in August 2024 outlined a staged open-pit operation scaling from 60,000 tonnes per day to 120,000 tonnes per day over a 22.6-year mine life. The study projected an after-tax net present value at an 8% discount rate of US$1.48 billion and an after-tax internal rate of return of 22.2%, with initial capital expenditures estimated at US$1.103 billion.

As of February 28, 2026, Oroco reported cash holdings of C$18.82 million and working capital of C$16.03 million, with no debt on its balance sheet. The company recorded a nine-month operating loss of C$4.19 million for 2026. The capital structure comprises approximately 325.95 million shares outstanding, following a C$23 million bought deal closed in January 2026 at C$0.38 per unit plus warrants.