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    Chile copper slag as artificial aggregate: design and risk notes for engineers

    February 27, 2026|

    Reviewed by Tom Sullivan

    First reported on International Mining – News

    30 Second Briefing

    Chile’s Ministry of Health has formally authorised the use of copper slag as an artificial aggregate in infrastructure works, including road surfacing, turning a major smelting waste stream into a regulated construction input. The decree defines copper slag as a by-product of copper pyrometallurgy and allows its controlled use in pavements and other civil works, subject to health and environmental criteria. For Chilean miners and contractors, this opens a large-scale outlet for slag stockpiles and may alter aggregate sourcing, pavement design and leachate management practices.

    Technical Brief

    • Decree is issued by Chile’s Ministry of Health, so criteria are framed as sanitary regulations.
    • Authorisation covers use as “artificial aggregate”, enabling substitution in bound and unbound pavement layers.
    • Scope includes road surfacing and broader infrastructure works, so both highway and urban projects are targeted.
    • Health-focused regulation implies limits on airborne dust, worker exposure and potential metal leaching pathways.
    • Formal definition of slag stream should simplify permitting for smelters holding large legacy stockpiles.
    • Contractors will need material characterisation protocols (grain size, density, contaminants) aligned with the decree’s criteria.

    Our Take

    Among the 140 Policy stories in our database, Chile appears frequently in items dealing with permitting and environmental standards, so formalising copper slag use there is likely to influence how other Andean regulators treat mine waste-derived construction materials.

    Across the 276 copper‑keyword pieces, most sustainability-tagged coverage has focused on tailings and water use; explicit approval of slag as aggregate signals a shift towards regulatory recognition of by-product valorisation as a legitimate closure and waste-reduction strategy for copper operations.

    For project developers in Chile’s copper sector, having slag recognised within a Standard/Guideline framework can materially change feasibility assumptions by turning a disposal liability into a potential construction input for nearby infrastructure projects.

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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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