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    Master Drilling–Boliden Somincor raiseboring: design and planning notes for mine engineers

    September 10, 2026|

    Reviewed by Tom Sullivan

    First reported on International Mining – News

    30 Second Briefing

    Master Drilling has secured its first Portuguese contract from copper-zinc producer Boliden Somincor to construct two raisebored shafts, each 630 m deep and 4.5 m in diameter. The twin vertical excavations will be critical for long-term hoisting, ventilation or service access, demanding precise control of deviation over the full 630 m and careful management of rock stability around the 4.5 m diameter openings. For geotechnical and mine planning teams, the project signals growing availability of large-diameter raiseboring capacity in European base metal operations.

    Technical Brief

    • Contract is Master Drilling’s first deployment of large-diameter raiseboring services in Portugal.
    • Award extends Master Drilling’s European footprint beyond existing operations in other base-metal jurisdictions.
    • Twin-shaft package implies coordinated scheduling of rig mobilisation, reaming passes and mucking logistics underground.
    • Raiseboring solution avoids full-length conventional shaft sinking, reducing exposure to underground drilling and blasting.
    • Long-term contract value and capex are undisclosed, but scope suggests multi-year execution and commissioning horizon.
    • For other European mining projects, availability of this capacity may de-risk future deepening or expansion studies.

    Our Take

    Our coverage shows Boliden Somincor’s Neves‑Corvo zinc and copper operation in Portugal is already being used as a testbed for underground automation and battery‑electric support equipment, so awarding a 630‑m, 4.5‑m raiseboring scope to Master Drilling aligns with a pattern of deploying advanced, specialist contractors at this site.

    Master Drilling’s recent work with remote raiseboring at Agnico Eagle’s Odyssey mine in Canada suggests that similar remote or semi‑autonomous practices could be applied to these two deep shafts in Portugal, which would be attractive for a highly mechanised copper‑zinc operation like Somincor.

    The combination of this shaft work with Boliden Somincor’s large on‑site solar UPAC project near Neves‑Corvo signals that long‑life copper and zinc infrastructure in Portugal is being planned around both deeper underground access and lower‑carbon power, which can strengthen the mine’s cost and ESG positioning within European base‑metal supply.

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    Prepared by collating external sources, AI-assisted tools, and Geomechanics.io’s proprietary mining database, then reviewed for technical accuracy & edited by our geotechnical team.

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