Abstract

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This project is focused on valuing mine tailings as resources, supplying metals that are extracted today via other processes, promoting
recycling, minimizing the production of hazardous waste and thereby embracing a circular economy. The project uses knowledge obtained in the ERAMIN project BioCriticalMetals (ERAMIN / 0002/2015) on the microbiome of tailings. The objective of the REVIVING project is to get improved models for efficient recycling metals from residues in case-study mines. For the first time, this is based on autochthonous tailings microbiome manipulation to promote the bioleaching-bacterial populations and innovative hydrometallurgy. The project covers the entire cycle of obtaining metals, from secondary sources to a product to sell. At the same time, by enabling true tailings recycling and reduction of residues produced by mining, we reconnect raw materials to the society. In perspective, the tailings basins could be used as a productive system for the provision of marketable metals. The expected success of this work will result in the validation of a clean, economic and innovative bioprocess for metal recovery from wastes, which will return residues to the productive cycle, supporting the EU's transition to a circular economy. The project will consist of several work steps, starting with small-scale assays performed in columns to test the potential of the manipulation of the tailings microbiome in leaching of Cu, Mn, Zn, Mo (non-critical major elements), W and Mg (critical metals) from tailings from Portuguese (Beralt Tin & Wolfram, Panasqueira) and Romanian (CUPRUMIN SA Abrud, CNCAF Minvest Deva) mines. REVIVING will innovate the bioleaching process enabling zero mine waste. The generated knowledge will push the EU to the front of the raw materials processing technologies and solutions. By recycling mine residues, soil areas will be returned to agriculture, forestry, and population, increasing mine social acceptance.