Littérature scientifique sur le sujet « Copper mines and mining – Germany – Mansfeld »

The Bioshale project, involving 13 partners throughout Europe, is co-funded by the European Commission under the FP6 program. The main objective of this project (which started in October 2004) is to identify and develop innovative biotechnological processes for ‘’eco-efficient’’ exploitation of metal-rich, black shale ores. Three extensive deposits have been selected for R&D actions. These are: (i) a site (in Talvivaara, Finland) that, at the outset of the project, had not been exploited; (ii) a deposit (in Lubin, Poland) that is currently being actively mined, and (iii) a third site (in Mansfeld, Germany) where the ore had been actively mined in the past, but which is no longer exploited. The black shale ores contain base (e.g. copper and nickel), precious (principally silver) and PGM metals, but also high contents of organic matter that potentially handicap metal recovery by conventional techniques. The main technical aspects of the work plan can be summarized as: (i) evaluation of the geological resources and selection of metal-bearing components; (ii) selection of biological consortia to be tested; (iii) assessment of bioprocessing routes, including hydrometallurgical processing; (iv) techno-economic evaluation of new processes from mining to metal recovery including social, and (v) assessing the environmental impacts of biotechnological compared to conventional processing of the ores. An overview of the main results obtained to date are presented, with special emphasis on the development of bioleaching technologies for metal recovery that can be applied to multielement concentrates and black shale ores.

The east and southeast rim of Harz mountains (Germany) are marked by a high density of former copper mining places dating back from the late 20th century to the middle age. A set of 18 soil samples from pre- and early industrial mining places and one sample from an industrial mine dump have been selected for investigation by 16S rRNA and compared with six samples from non-mining areas. Although most of the soil samples from the old mines show pH values around 7, RNA profiling reflects many operational taxonomical units (OTUs) belonging to acidophilic genera. For some of these OTUs, similarities were found with their abundances in the comparative samples, while others show significant differences. In addition to pH-dependent bacteria, thermophilic, psychrophilic, and halophilic types were observed. Among these OTUs, several DNA sequences are related to bacteria which are reported to show the ability to metabolize special substrates. Some OTUs absent in comparative samples from limestone substrates, among them Thaumarchaeota were present in the soil group from ancient mines with pH > 7. In contrast, acidophilic types have been found in a sample from a copper slag deposit, e.g., the polymer degrading bacterium Granulicella and Acidicaldus, which is thermophilic, too. Soil samples of the group of pre-industrial mines supplied some less abundant, interesting OTUs as the polymer-degrading Povalibacter and the halophilic Lewinella and Halobacteriovorax. A particularly high number of bacteria (OTUs) which had not been detected in other samples were found at an industrial copper mine dump, among them many halophilic and psychrophilic types. In summary, the results show that soil samples from the ancient copper mining places contain soil bacterial communities that could be a promising source in the search for microorganisms with valuable metabolic capabilities.

Defence date: 29 June 2010
Examining Board: Prof. Heinz-Gerhard Haupt (EUI); Prof. Peter Hertner (Universitaet Halle); Prof. Renate Pieper (University of Graz); Prof. Sebastian Conrad (EUI)
PDF of thesis uploaded from the Library digital archive of EUI PhD theses

This survey of prehistoric copper mines in Europe began with the oldest known examples, namely Rudna Glava and Ai Bunar in the Balkans. It is now time to consider some of the largest Bronze Age mines, which were major producers of copper that influenced its supply across large parts of the continent. Much of the focus is on Austria, where the earliest scientific investigations of early copper mines were undertaken in Europe. The earliest use of copper in central Europe can be linked to a Late Neolithic culture called the Münchshöfen group, best known in south-eastern Bavaria. A small number of copper objects can be associated with this culture group, including axe-hammers and flat axes, awls, beads, and rings. Scientific analysis of these objects reveals that they probably originated in the Balkans, as part of a spread of metal use into central Europe from that area during the second half of the fifth millennium BC (Höppner et al. 2005). This is supported by the material culture of the Münchshöfen group, in particular the ceramic evidence, which finds close typological parallels with metal-using groups in the Carpathian Basin. It is likely that the same spread of copper use into Austria and southern Germany eventually led to the first attempts to exploit the copper resources of the Alpine region. The evidence comes from the hill-top settlement of Mariahilfbergl near Brixlegg in the Inn Valley of North Tyrol, Austria. Excavation uncovered traces of metallurgical processes in the form of a fireplace with fragments of copper slag, two clay nozzles, and two items of copper metal (Bartelheim et al. 2002, 2003). Radiocarbon analysis indicates a 4500–3640 BC date range, however, the wider cultural context of the site may place these discoveries in the later fifth millennium BC. It is not certain whether smelting took place in this site, though some of the slag-like material suggests the heat treatment of a type of fahlore (tetrahedrite) that is common in the Brixlegg area. Interestingly, chemical and lead isotope analyses of a copper bead and copper strip from the same site context revealed a different chemical composition from that of the slag, one that matches with copper metalwork from Bulgaria and Serbia (Pernicka et al. 1997).