Tell a friend Print Sitemap ABOUT US SERVICES MISSION WORK WITH US CONTACT ENVIRONMENTAL TECHNICAL INVESTIGATION Bergab has, on behalf of Boliden Mineral AB, carried out an environmental technical investigation of the closed sulphide ore mine in Holmtjärn. Surface and groundwater issues Groundwater modeling Field surveys The mining area consists of a ventilation shaft and a waste rock storage, which were finished in the 1990s. Continued high levels of metal in outgoing water from the area show that additional complementary measures are required. The source of elevated metal levels was unknown. The assignment was carried out by establishing a conceptual hydrogeological model, based on exploratory drilling and mapping of surface and groundwater dividers. During the study, samples of surface and groundwater were carried out for chemical analysis. New and existing analysis results and calculations of water flows from different sub-areas formed the basis for a quantification of metal transports through the area. The study was able to show that part of the waste rock landfill was the main source. Various methods for additional finishing and / or water purification were described and a proposal for further handling of the issue was drawn up. <a href='/upl/images/408827.jpg' title='Holmtjärn' class='magnify fancybox'> Holmtjärn & nbsp; </a> Hellman Henrik Permit review & EIA 08-564 855 08 0703-23 98 50 Löfberg Marlene Hydrogeology 08-564 855 20 0708-44 83 53 ABOUT US Quality assurance Environmental work Work with us SERVICES Geophysics Rock facilities Environmental assessment / EIA Construction management MISSION New subway Holmtjärn The western link The Söderström tunnel CONTACT Stockholm office Gothenburg office Coworker © 2017 Bergab - Berggeologiska Undersökningar AB Web design: Sphinxly web agency, more about us . CMS: Easyweb publishing tool Cookies About the website Sitemap