{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,28]],"date-time":"2026-02-28T04:26:57Z","timestamp":1772252817736,"version":"3.50.1"},"reference-count":30,"publisher":"MDPI AG","issue":"10","license":[{"start":{"date-parts":[[2019,10,17]],"date-time":"2019-10-17T00:00:00Z","timestamp":1571270400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001871","name":"Funda\u00e7\u00e3o para a Ci\u00eancia e a Tecnologia","doi-asserted-by":"publisher","award":["ERA-MIN\/0007 \u201cImprove Resource Efficiency and Minimize Environmental Footprint (REMinE)\u201d"],"award-info":[{"award-number":["ERA-MIN\/0007 \u201cImprove Resource Efficiency and Minimize Environmental Footprint (REMinE)\u201d"]}],"id":[{"id":"10.13039\/501100001871","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001871","name":"Funda\u00e7\u00e3o para a Ci\u00eancia e a Tecnologia","doi-asserted-by":"publisher","award":["UID\/ECI\/04028\/2013 Centro de Recursos Naturais e Ambiente (CERENA)"],"award-info":[{"award-number":["UID\/ECI\/04028\/2013 Centro de Recursos Naturais e Ambiente (CERENA)"]}],"id":[{"id":"10.13039\/501100001871","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Minerals"],"abstract":"<jats:p>Demand growth for metallic minerals has been faced with the need for new techniques and improving technologies for all mining life-cycle operations. Nowadays, the exploitation of old tailings and mine-waste facilities could be a solution to this demand, with economic and environmental advantages. The Panasqueira Mine has been operating for more than a century, extracting tungsten and tin ore. Its first processing plant, \u201cRio\u201d, was located near the Z\u00earere river, where mineral-processing residues were deposited on the top hillside on the margin of this river in the Cabe\u00e7o do Pi\u00e3o tailings dam. The lack of maintenance and monitoring of this enormous structure in the last twenty years represents a high risk to the environment and the population of the surrounding region. A field-sample campaign allowed the collection of data, and resulted from laboratory tests to use regression optimization. Re-mining the tailings by hydrometallurgical methods was considered to satisfy the two conditions of metal demand and environmental risk. The metal content in Cabe\u00e7o do Pi\u00e3o was shown be enough for environmental restoration. The re-mining solution was studied, taking into account the technical, economic, social, and environmental aspects.<\/jats:p>","DOI":"10.3390\/min9100638","type":"journal-article","created":{"date-parts":[[2019,10,17]],"date-time":"2019-10-17T11:07:59Z","timestamp":1571310479000},"page":"638","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["A Holistic Approach in Re-Mining Old Tailings Deposits for the Supply of Critical-Metals: A Portuguese Case Study"],"prefix":"10.3390","volume":"9","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1396-7889","authenticated-orcid":false,"given":"Janine","family":"Figueiredo","sequence":"first","affiliation":[{"name":"CERENA\u2014Polo FEUP\u2014Centre for Natural Resources and the Environment, Faculty of Engineering, University of Porto, 4099002 Porto, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5063-5632","authenticated-orcid":false,"given":"M. Cristina","family":"Vila","sequence":"additional","affiliation":[{"name":"CERENA\u2014Polo FEUP\u2014Centre for Natural Resources and the Environment, Faculty of Engineering, University of Porto, 4099002 Porto, Portugal"}]},{"given":"Ant\u00f3nio","family":"Fi\u00faza","sequence":"additional","affiliation":[{"name":"CERENA\u2014Polo FEUP\u2014Centre for Natural Resources and the Environment, Faculty of Engineering, University of Porto, 4099002 Porto, Portugal"}]},{"given":"Joaquim","family":"G\u00f3is","sequence":"additional","affiliation":[{"name":"CERENA\u2014Polo FEUP\u2014Centre for Natural Resources and the Environment, Faculty of Engineering, University of Porto, 4099002 Porto, Portugal"}]},{"given":"Aurora","family":"Futuro","sequence":"additional","affiliation":[{"name":"CERENA\u2014Polo FEUP\u2014Centre for Natural Resources and the Environment, Faculty of Engineering, University of Porto, 4099002 Porto, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4774-2533","authenticated-orcid":false,"given":"M. Lurdes","family":"Dinis","sequence":"additional","affiliation":[{"name":"CERENA\u2014Polo FEUP\u2014Centre for Natural Resources and the Environment, Faculty of Engineering, University of Porto, 4099002 Porto, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6900-5702","authenticated-orcid":false,"given":"Diogo","family":"Martins","sequence":"additional","affiliation":[{"name":"Faculty of Engineering, University of Porto, 4099002 Porto, Portugal"}]}],"member":"1968","published-online":{"date-parts":[[2019,10,17]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Tang, C., Li, K., Ni, W., and Fan, D. (2019). Recovering iron from iron ore tailings and preparing concrete composite admixtures. 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