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Aim-listed mineral exploration and development company Tertiary Minerals has outlined a higher-grade, shallow silver/copper/zinc mineralised zone at its Target A1 prospect at the Mushima North project, in Zambia. The company has reported assay results from 29 of the 39 holes drilled during its Phase 4 programme, which covered 3 639 m, with results from a further eight holes awaited and two holes yet to be submitted for analysis.