Pit Lake Slope Stability under Water Level Variations

Geosciences, Год журнала: 2024, Номер 14(6), С. 142 - 142

Опубликована: Май 24, 2024

This paper presents the results of a geotechnical investigation regarding slope stability in pit lake, emphasizing impact water level variations. Advanced analysis techniques were utilized for this study. The research was performed by using fully coupled flow-deformation analyses. For approach, Bishop’s effective-stress equation used, and description soil hydraulic behavior, Van Genuchten’s model applied. associated with reservoir changes revealed that tended to become unstable as decreased; factor negatively related rate reduction. Concerning fluctuations, analyses mass seemed less stable change increased. Under specific range rates variation, safety became higher number fluctuations Additionally, simulation concerning rising indicate pressure due external acts on surface positive factor. obtained reflect effects under site condition, but they can be used reference evaluating lake design.

Язык: Английский

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Die Bedeutung der Nitratdynamik in Grubenseen in trockeneren Regionen

Mine Water and the Environment, Год журнала: 2024, Номер 43(2), С. 231 - 254

Опубликована: Июнь 1, 2024

Язык: Английский

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The role of pit lake thermal dynamics on the thermal performance of ground heat exchangers

Scientific Reports, Год журнала: 2024, Номер 14(1)

Опубликована: Авг. 19, 2024

The addition of ground heat exchangers (GHEs) to a pit lake's basin has the potential for abundant, clean and renewable geothermal energy extraction using shallow systems. Basin-embedded GHEs avoid direct interaction with mine water, which been shown impact efficiency longevity in open-loop systems negatively. now accelerated closure open-pit coal mines presents itself as an opportunity use this technology. However, no guidelines currently exist designing or operating embedded sediment water bodies. Furthermore, two-way coupling between complex annual thermal fluid dynamics that lakes are naturally subjected fluxes on sediments GHE system not explored. In study, we develop validate finite element models assess relevance lake stratification performance bodies basins, e.g., closures, under temperate residential loads. results show role sink improves significantly when accounted for, increase up 292% available budget. A minor variation budget (~8%) was found whether is modelled explicitly simplified transient Dirichlet temperature boundary condition. This small difference vanishes if horizontal circulation along considered, highlighting potential. Finally, Coefficient Performance (COP) evaluated, maximum ~15% among all cases.

Язык: Английский

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Pit Lakes in Abandoned Slate Quarries in Northwestern Spain: Characteristics and Potential Uses

Water, Год журнала: 2024, Номер 16(17), С. 2403 - 2403

Опубликована: Авг. 27, 2024

Human activities play a key role in landscape evolution. Mining is one of the most important these since it changes large parts Earth’s surface. In abandoned mines and quarries, pit lakes are quite common due to water table blocking. These have remarkable ecological characteristics, but they still poorly understood. Northwestern Spain has long tradition use slate for roofs. This exploitation, mostly open-pit, caused great transformation including generation lakes. this work, 27 quarries areas been analysed using orthophotos different years, UAV (unmanned aerial vehicle) images field work. each lake, topographic context, geomorphological dynamics, morphometric parameters (including depth), pH, variables were measured. Other uses quarry their significance as new geo-ecological environment also discussed. The results show types and, consequently, potential case. Only six offer good conditions recreational uses, whereas rest (21) slope instability or poor quality.

Язык: Английский

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Below Water Table Mining, Pit Lake Formation, and Management Considerations for the Pilbara Mining Region of Western Australia

Mining, Год журнала: 2024, Номер 4(4), С. 863 - 888

Опубликована: Окт. 17, 2024

Located in northern Western Australia, the Pilbara is highest productivity region for iron ore and other metal mining Australia. As elsewhere, mine closure guidelines typically require post-closure landforms to be safe, stable, non-polluting sustainable here long-term. I reviewed primary literature, including international, national state government regional case studies related socio-environmental topics, understand key risks management strategies needed achieve these broad expectations below water table (BWT) mining. Many BWT open cut projects will result pit lakes this region, many of which very large degrade quality with increasing salinisation over time. an arid are dominated by alterations hydrology hydrogeology largely unmodified natural waterways freshwater aquifers. Although remote, social may also present, especially terms impacts groundwater values. This remoteness decreases potential realising practicable development post-mining land uses lakes. Explicitly considered risk-based decisions should determine outcomes voids, when backfill prevent lake formation warranted. However, maintaining or backfilling a void against balance opportunities.

Язык: Английский

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Hydrological classification of mine pit lakes using modelling experiments

Journal of Environmental Management, Год журнала: 2024, Номер 370, С. 123057 - 123057

Опубликована: Окт. 30, 2024

With the growing global prevalence of open-pit mining activities, there is an increasing necessity for sustainable mine life cycle plans with early outlook towards closure. A major consideration in closure planning potential formation lakes void and how these "pit lakes" can be managed to minimise risks and, if possible, create benefits. Understanding long-term interactions between pit lakes, groundwater, surface water systems essential that purpose. While numerous site-specific studies have been undertaken, no aim provide a general, broadly applicable understanding lake hydrology relates geographical context, efforts hydrologically classify using criteria. This research employs integrated generic balance model examine surrounding groundwater. Simulating 243 scenarios, influence five input factors (climate, hydraulic conductivity, regional groundwater level, catchment area slope) on behaviour up 6000 years beyond was considered. The assessment focused four hydrological attributes once system reached equilibrium: time equilibrium, fraction days where recharges overflow from lake. All scenarios were assigned one classes based Our findings show that, many contexts, general data climate type subsurface conductivity yield reliable predictions lake's classification without having develop detailed, model. needs improvements non-arid climates inter-annual variation rainfall pronounced. particularly valuable first-pass risk assessments determine whether modelling required.

Язык: Английский

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Enrichment of acid-tolerant sulfide-producing microbes from an acidic pit lake

Frontiers in Microbiology, Год журнала: 2024, Номер 15

Опубликована: Окт. 30, 2024

High concentrations of harmful metal(loid)s and extreme acidity are persistent environmental concerns in acidic pit lakes. In this study, we examine Cueva de la Mora (CM), a meromictic lake the Iberian Pyrite Belt, Spain, as model system. Our research aims to explore potential bioremediation strategies mitigate impacts such environments. The major strategy applied is biologically stimulate sulfate reduction (i.e., biosulfidogenesis) deep layer promote formation low-solubility sulfide minerals. Previous omics-based studies CM have shown that several sulfate-reducing bacteria (SRB) taxa present layer. However, their activities likely limited by availability electron donors for production. Therefore, different amendments (glycerol, elemental sulfur, glycerol + sulfur) were tested production enrich acid-tolerant sulfide-producing microbes. results showed stimulated dissimilatory much faster than sulfur alone, suggesting donor limitations control Furthermore, combined addition (S(0)) resulted highest level This indicates S(0) can play significant role an acceptor further promoting when suitable present. Microbial community analysis revealed

Язык: Английский

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