Monitoring of Groundwater Quality With Cokriging of Geochemical and Geoelectrical Measurements

The study presents the possibility of using geostatistical methods for monitoring groundwater quality. Poland is one of the largest copper producers in the world. However, the extraction and production of copper requires constant care for the natural environment. Reservoir Żelazny Most which is situated in South – Western Poland was designed to store flotation tailings out of nearby copper mines. It is one of the biggest industrial dumps in the world. The reservoir stores huge amounts of tailings and industrial water. Water migrating from dump to groundwater could be a potential source of contamination with chlorides, sulphates, heavy metals, and other hazardous substances used in ore separation process in the copper mining industry, like detergent and phenols. Monitoring system around Żelazny Most dump, which was designed to track harmful substances concentrations in groundwater, contains measuring wells and piezometers. They are used to collect groundwater samples for chemical analyses. The idea of the study was to integrate information provided by chemical analyses and geoelectrical measurements by cokriging method, utilizing correlation between electrical resistance of the soil solution and total dissolved solids concentration in groundwater. This enabled to obtain spatial distribution of total dissolved solids concentrations in groundwater at the part of eastern foreground of Żelazny Most dump.

Characteristics of Natural Background Radiation in the Polkowice-Sieroszowice Mine, Poland

Natural radioactivity in underground locations is the main parameter for the safety of work (occupational hazards) and for the success of experiments in physics or biology requiring unique conditions. The characterization of natural prominence was carried out in the Conceptual Lab development in one of KGHM deep copper mines co-ordinated by KGHM Cuprum R&D. Natural radioactivity studies were performed and included in situ gamma spectrometry, neutron flux measurements, radon concentration, and alpha and gamma laboratory spectrometry measurements of rock samples. At a depth of 1014.4 m (2941.8 m w.e.) within the anhydrite layer, a neutron flux of 2.0 ± 0.2 × 10−6 cm−2 s−1, a gamma-ray dose of 0.008 ± 0.001 μSv/h, a photon flux density of 0.64 ± 0.20 cm−2 s−1, and a radon concentration of 6.6 Bq/m3 were determined. Laboratory analyses of 226,228Ra, 40K, and 238,234U concentrations in collected rock samples showed low values. The exceptionally low level of natural radioactivity in the Polkowice-Sieroszowice mine makes this location a unique place for scientific research.

Application of Hydraulic Backfill for Rockburst Prevention in the Mining Field with Remnant in the Polish Underground Copper Mines

In the polish underground copper mines owned by KGHM Polska Miedz S.A, various types of room and pillar mining systems are used, mainly with roof deflection, but also with dry and hydraulic backfill. One of the basic problems associated with the exploitation of copper deposits is rockburst hazard. Aa high level of rockburst hazard is caused by mining the ore at great depth in difficult geological and mining conditions, among others, in the vicinity of remnants. The main goal of this study is to investigate how hydraulic backfill improves the geomechanical situation in the mining filed and reduce rockburst risk in the vicinity of remnants. Numerical modeling was conducted for the case study of a mining field where undisturbed ore remnant, 40 m in width, was left behind. To compare the results, simulations were performed for a room and pillar mining system with roof deflection and for a room and pillar mining system with hydraulic backfill. Results of numerical analysis demonstrate that hydraulic backfill can limit rock mass deformation and disintegration in the mining field where remnants have been left. It may also reduce stress concentration inside or in the vicinity of a remnant, increase its stability, as well as prevent and reduce seismic and rockburst hazards. Hydraulic backfill as a local support stabilizes the geomechanical situation in the mining field.

‘To work more, produce more and defend the revolution’: Copper workers from socialism to neoliberalism

On 11 July 1971, Chile’s National Congress, in a historic vote, unanimously approved reforming the constitution, which opened the door to nationalise the large-scale copper industry. Traditional historical accounts of the nationalisation of copper had emphasised a history of negotiations between foreign capital and the Chilean government, documenting how economists and political leaders experimented with different approaches to obtain a share of the profits from the country’s most valuable commodity. By focusing exclusively on the political economy, however, scholars have overlooked the role of workers during and after the process of nationalisation and failed to account for why copper miners continued to fight to protect a state-owned company. Influenced by Peter Winn’s Weavers of Revolution and recent studies on people’s experience during the Popular Unity (UP) era, this article looks at the nationalisation of copper from below. It analyses how workers fought for, understood and experienced the nationalisation; how the UP transformed labour relations at the local level; and how the military, after 1973, redesigned the state company. By placing workers at the centre of the nationalisation, this article can help better understand its importance as a matter of both political economy and workers’ power and explain why the copper mines became the first site of labour resistance against the military regime.

Reforms will raise doubts over Chile's mining outlook

Significance However, mining companies are warning that bills before Congress and possible changes under a new constitution to be drawn up by a recently elected constitutional convention could raise doubts over these plans. Impacts As Chile’s copper mines age, efficiency gains will be ever more important for the industry’s ongoing international competitiveness. As countries seek to decarbonise, 'clean' copper will command an increasing price premium. In the constitutional convention, left-wing sectors will argue against extractivism as a manifestation of neoliberalism.