Oroco Continues South Zone Success

Vancouver, British Columbia--(Newsfile Corp. - September 10, 2026) - Oroco Resource Corp. (TSXV: OCO) (OTCQB: ORRCF) ("Oroco" or the "Company") is pleased to report the fourth batch of assay results from its Phase 2 resource drilling program in the South Zone of the Santo Tomás copper project in Choix, Sinaloa, Mexico. The results cover ten drill holes, S035 through S044.

Drill-hole locations are shown on Figure 1, and collar details are provided in Table 1. Drill holes S061 (at 256 m), S063 (at 225 m) and S064 (at 10 m) are currently in progress in the Pillar Zone between the North and South Zones: 42 holes of the Phase 2 program have been completed including 12,649.3 m drilled. To date, 11,431 m of core has been sampled during Phase 2, representing 7,543 samples of which 6,255 are core samples and 1,288 are QA/QC samples: this count includes some samples from drill holes S057 and S058. The Company has previously reported Phase 2 drilling for holes S022 through S034. Oroco currently has three drill rigs operating at Santo Tomás.

Highlights

Notable Results

S035: 57.4 m grading 0.72% CuEq from 108 m .

S038 and S041 ended in mineralization approximately 200 m and 90 m, respectively, below the current PEA pit limits.

S039: 103 m grading 0.58% CuEq from 98 m.

S040: 154 m grading 0.51% CuEq from 131 m , followed by 14 m grading 0.83% CuEq from 287 m.

S042: 369.3 m from surface grading 0.45% CuEq.

All intervals are downhole lengths. See Table 2 and the accompanying technical notes.

"These overall results provide further confidence in the South Zone model while also identifying mineralization beyond the current PEA pit limits," said Charles Cryer, CEO . "The long S042 intercept and the extensions in S038 and S041 improve our geological understanding as South Zone resource drilling nears completion and the drill rigs migrate into the Pillar Zone. The drilling has also strengthened the historical dataset used for fu