Mining of the Basal Reef at Jeanette Mine, is typically complicated due to an overlaying Khaki Shale (shale) that has unfavourable rock engineering properties. Shale has always been either left underground or mined as part of the orebody. The first approach can only be applied in areas where the quartzite beam (directly above the Basal Reef and below the shale) is of sufficient thickness to support the shale in the hanging wall. This method is known as undercutting. Alternatively, open stoping can be applied in areas where the shale and the Basal Reef is extracted concurrently and sent to the mill as diluted ore. Alternatively, a resue stoping method can be considered in areas where undercutting cannot be done, due to a thin quartzite middling. Resue stoping involves stowing or packing of the shale into the mined-out area and is not included as part of the hoisted rock. In the past, resue stoping was done by hand packing, which is unsuitable for a modern mine. As such, two mechanised resue stoping methods can be considered, namely; Longhole Resue Stoping and Rib Cutting Resue Stoping. Rib Cutting Resue Stoping utilises a continuous miner (“CM”) to remove the shale in a first pass, extract the reef during a second pass and backfilling the mined-out rib with shale. The use of a CM will significantly improve the extraction/mining rate, sidewall stability, backfill placement, dilution and overall safety. Longhole Resue Stoping utilises strike drives from where longholes are drilled into the shale and the reef in an up-dip direction moving on retreat. The shale is blasted with sufficient force into the mined-out area behind it, compacting it. The reef will be loaded by Load Haul Dumper (“LHD”) or dozer. It was determined that Rib Cutting Resue Stoping is more effective than Longhole Resue Stoping due to a higher extraction rate, lower dilution, reef loss reduction and improved shale sidewall stability. The operating angles and equipment height limits the application to only 51% of the available reef at Jeanette mine with favourable dip and thickness. Longhole Stoping can navigate hard rock, shale and increased dip angles; it can be applied to 91% of the available ore deposit. Longhole Resue Stoping and Rib Cutting Resue Stoping should both be considered as suitable stoping methods for Jeanette. / Thesis is submitted in partial fulfilment for the degree of Master of Science in Engineering to the Faculty of Engineering and the Built Environment, School of Mining Engineering, 2018 / XL2019

Thesis. 1976. M.S.--Massachusetts Institute of Technology. Dept. of Civil Engineering. / Microfiche copy available in Archives and Engineering. / Bibliography: leaf 116. / M.S.

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O presente trabalho avaliou o comportamento hidráulico e reativo de um solo argiloso compactado na energia proctor modificada, com adição de cimento Portland, para fins de aplicação em barreiras impermeáveis de fundo em aterros de resíduos sólidos industriais e de mineração, quando submetido à ação de carga estática de resíduos e em contato com lixiviado ácido enriquecido com os metais cádmio e chumbo. Um Latossolo argiloso residual da cidade de Passo Fundo - RS foi utilizado para moldagem de corpos de prova. A adição de cimento nas proporções de 0% a 2% teve como objetivo melhorar as condições reativas da barreira. Para verificação do comportamento hidráulico foram executados ensaios de condutividade hidráulica. O comportamento reativo foi avaliado por meio de ensaios de difusão, os quais foram realizados com aplicação de carga estática variável (0 kPa a 500 kPa). Soluções contaminantes contendo respectivamente 10 mg/L de cádmio e 10 mg/L de chumbo foram elaboradas com pH variando na faixa de 1 a 6. A partir de ensaio de difusão foram determinados o fator de retardamento (Rd), o coeficiente de distribuição (Kd) e o coeficiente de difusão efetiva (D*), para cada combinação de pH, % cimento e carga estática aplicada. Os resultados obtidos para a mistura compactada investigada indicaram um baixo coeficiente de condutividade hidráulica (<10-9 m/s) e valores que sofreram redução com o acréscimo de cimento. Em relação ao comportamento reativo, os valores de Rd e Kd sofreram incrementos, principalmente com o aumento do pH da solução contaminante, evidenciando o aumento da retenção dos metais. O D* não sofreu influência para os ensaios com Cd e sofreu redução devido à intensa precipitação química em solução que ocorreu devido ao acréscimo de cimento nos ensaios com Pb. A ação conjunta do aumento do pH e da adição de cimento à barreira ocasionou a maior ocorrência de reações de precipitação na barreira, do que reações de adsorção, o que não foi favorável porque possibilita que o contaminante permaneça em solução e possa ser solubilizado em presença de meio ácido. Nesse sentido, a condição que se apresentou mais favorável para o projeto de uma barreira impermeável e reativa foi de 0% de cimento para Pb e 1% de cimento para Cd, as quais desencadearam maiores os valores de Rd e Kd, considerando o contaminante na sua condição mais ácida (pH 1). Em relação à magnitude dos parâmetros Rd e Kd, Pb apresentou maiores valores do que Cd, indicando menor mobilidade. / This study evaluated the hydraulic and reactive behavior of a clayey soil compacted at modified energy proctor, with and without the addition of Portland cement, aiming at its use as containment barriers for industrial and mining solid waste disposal facilities, when subjected to the action of a static load simulating the solid waste mass and to an acid leachate enriched with metals cadmium and lead. A clayey residual Oxisol from Passo Fundo - RS was used for molding specimens. The cement addition in the proportions of 0% to 2% aimed to improve the reactive potential of barrier. Tests of hydraulic conductivity were performed to investigate the hydraulic behavior. The reactive behavior was evaluated through diffusion tests which were conducted with variable static load (0 kPa to 500 kPa). Contaminant solutions were prepared with pH varying from 1 to 6 and 10 mg/L, for both cadmium and lead. The retardation factor (Rd), the distribution coefficient (Kd) and the effective diffusion coefficient (D*) were determined for each combination of pH, % cement and static load. The results obtained showed a low hydraulic conductivity coefficient (<10-9 m/s) and values that decreased with the increasing cement content. Regarding the reactive behavior, the values of Kd and Rd increased mainly with the pH solution increment, causing the increase of metals retention. D* was not affected in the tests with Cd, but was reduced in the tests with Pb, probably by the intense chemical precipitation that occurred due to the cement addition. The combined action of increasing both the pH and the cement addition caused a higher level of precipitation reactions, which allows the contaminant to remain in solution and be solubilized in acid environment. In this sense, the condition which was most favorable for the design of an reactive and impermeable barrier was 0% cement for Pb and 1% cement for Cd, which provided the highest Rd and Kd values, considering the contaminant at its most acidic condition. Regarding the parameters Rd and Kd magnitudes, Pb showed higher values than Cd, indicating less mobility.

O presente trabalho avaliou o comportamento hidráulico e reativo de um solo argiloso compactado na energia proctor modificada, com adição de cimento Portland, para fins de aplicação em barreiras impermeáveis de fundo em aterros de resíduos sólidos industriais e de mineração, quando submetido à ação de carga estática de resíduos e em contato com lixiviado ácido enriquecido com os metais cádmio e chumbo. Um Latossolo argiloso residual da cidade de Passo Fundo - RS foi utilizado para moldagem de corpos de prova. A adição de cimento nas proporções de 0% a 2% teve como objetivo melhorar as condições reativas da barreira. Para verificação do comportamento hidráulico foram executados ensaios de condutividade hidráulica. O comportamento reativo foi avaliado por meio de ensaios de difusão, os quais foram realizados com aplicação de carga estática variável (0 kPa a 500 kPa). Soluções contaminantes contendo respectivamente 10 mg/L de cádmio e 10 mg/L de chumbo foram elaboradas com pH variando na faixa de 1 a 6. A partir de ensaio de difusão foram determinados o fator de retardamento (Rd), o coeficiente de distribuição (Kd) e o coeficiente de difusão efetiva (D*), para cada combinação de pH, % cimento e carga estática aplicada. Os resultados obtidos para a mistura compactada investigada indicaram um baixo coeficiente de condutividade hidráulica (<10-9 m/s) e valores que sofreram redução com o acréscimo de cimento. Em relação ao comportamento reativo, os valores de Rd e Kd sofreram incrementos, principalmente com o aumento do pH da solução contaminante, evidenciando o aumento da retenção dos metais. O D* não sofreu influência para os ensaios com Cd e sofreu redução devido à intensa precipitação química em solução que ocorreu devido ao acréscimo de cimento nos ensaios com Pb. A ação conjunta do aumento do pH e da adição de cimento à barreira ocasionou a maior ocorrência de reações de precipitação na barreira, do que reações de adsorção, o que não foi favorável porque possibilita que o contaminante permaneça em solução e possa ser solubilizado em presença de meio ácido. Nesse sentido, a condição que se apresentou mais favorável para o projeto de uma barreira impermeável e reativa foi de 0% de cimento para Pb e 1% de cimento para Cd, as quais desencadearam maiores os valores de Rd e Kd, considerando o contaminante na sua condição mais ácida (pH 1). Em relação à magnitude dos parâmetros Rd e Kd, Pb apresentou maiores valores do que Cd, indicando menor mobilidade. / This study evaluated the hydraulic and reactive behavior of a clayey soil compacted at modified energy proctor, with and without the addition of Portland cement, aiming at its use as containment barriers for industrial and mining solid waste disposal facilities, when subjected to the action of a static load simulating the solid waste mass and to an acid leachate enriched with metals cadmium and lead. A clayey residual Oxisol from Passo Fundo - RS was used for molding specimens. The cement addition in the proportions of 0% to 2% aimed to improve the reactive potential of barrier. Tests of hydraulic conductivity were performed to investigate the hydraulic behavior. The reactive behavior was evaluated through diffusion tests which were conducted with variable static load (0 kPa to 500 kPa). Contaminant solutions were prepared with pH varying from 1 to 6 and 10 mg/L, for both cadmium and lead. The retardation factor (Rd), the distribution coefficient (Kd) and the effective diffusion coefficient (D*) were determined for each combination of pH, % cement and static load. The results obtained showed a low hydraulic conductivity coefficient (<10-9 m/s) and values that decreased with the increasing cement content. Regarding the reactive behavior, the values of Kd and Rd increased mainly with the pH solution increment, causing the increase of metals retention. D* was not affected in the tests with Cd, but was reduced in the tests with Pb, probably by the intense chemical precipitation that occurred due to the cement addition. The combined action of increasing both the pH and the cement addition caused a higher level of precipitation reactions, which allows the contaminant to remain in solution and be solubilized in acid environment. In this sense, the condition which was most favorable for the design of an reactive and impermeable barrier was 0% cement for Pb and 1% cement for Cd, which provided the highest Rd and Kd values, considering the contaminant at its most acidic condition. Regarding the parameters Rd and Kd magnitudes, Pb showed higher values than Cd, indicating less mobility.

O presente trabalho avaliou o comportamento hidráulico e reativo de um solo argiloso compactado na energia proctor modificada, com adição de cimento Portland, para fins de aplicação em barreiras impermeáveis de fundo em aterros de resíduos sólidos industriais e de mineração, quando submetido à ação de carga estática de resíduos e em contato com lixiviado ácido enriquecido com os metais cádmio e chumbo. Um Latossolo argiloso residual da cidade de Passo Fundo - RS foi utilizado para moldagem de corpos de prova. A adição de cimento nas proporções de 0% a 2% teve como objetivo melhorar as condições reativas da barreira. Para verificação do comportamento hidráulico foram executados ensaios de condutividade hidráulica. O comportamento reativo foi avaliado por meio de ensaios de difusão, os quais foram realizados com aplicação de carga estática variável (0 kPa a 500 kPa). Soluções contaminantes contendo respectivamente 10 mg/L de cádmio e 10 mg/L de chumbo foram elaboradas com pH variando na faixa de 1 a 6. A partir de ensaio de difusão foram determinados o fator de retardamento (Rd), o coeficiente de distribuição (Kd) e o coeficiente de difusão efetiva (D*), para cada combinação de pH, % cimento e carga estática aplicada. Os resultados obtidos para a mistura compactada investigada indicaram um baixo coeficiente de condutividade hidráulica (<10-9 m/s) e valores que sofreram redução com o acréscimo de cimento. Em relação ao comportamento reativo, os valores de Rd e Kd sofreram incrementos, principalmente com o aumento do pH da solução contaminante, evidenciando o aumento da retenção dos metais. O D* não sofreu influência para os ensaios com Cd e sofreu redução devido à intensa precipitação química em solução que ocorreu devido ao acréscimo de cimento nos ensaios com Pb. A ação conjunta do aumento do pH e da adição de cimento à barreira ocasionou a maior ocorrência de reações de precipitação na barreira, do que reações de adsorção, o que não foi favorável porque possibilita que o contaminante permaneça em solução e possa ser solubilizado em presença de meio ácido. Nesse sentido, a condição que se apresentou mais favorável para o projeto de uma barreira impermeável e reativa foi de 0% de cimento para Pb e 1% de cimento para Cd, as quais desencadearam maiores os valores de Rd e Kd, considerando o contaminante na sua condição mais ácida (pH 1). Em relação à magnitude dos parâmetros Rd e Kd, Pb apresentou maiores valores do que Cd, indicando menor mobilidade. / This study evaluated the hydraulic and reactive behavior of a clayey soil compacted at modified energy proctor, with and without the addition of Portland cement, aiming at its use as containment barriers for industrial and mining solid waste disposal facilities, when subjected to the action of a static load simulating the solid waste mass and to an acid leachate enriched with metals cadmium and lead. A clayey residual Oxisol from Passo Fundo - RS was used for molding specimens. The cement addition in the proportions of 0% to 2% aimed to improve the reactive potential of barrier. Tests of hydraulic conductivity were performed to investigate the hydraulic behavior. The reactive behavior was evaluated through diffusion tests which were conducted with variable static load (0 kPa to 500 kPa). Contaminant solutions were prepared with pH varying from 1 to 6 and 10 mg/L, for both cadmium and lead. The retardation factor (Rd), the distribution coefficient (Kd) and the effective diffusion coefficient (D*) were determined for each combination of pH, % cement and static load. The results obtained showed a low hydraulic conductivity coefficient (<10-9 m/s) and values that decreased with the increasing cement content. Regarding the reactive behavior, the values of Kd and Rd increased mainly with the pH solution increment, causing the increase of metals retention. D* was not affected in the tests with Cd, but was reduced in the tests with Pb, probably by the intense chemical precipitation that occurred due to the cement addition. The combined action of increasing both the pH and the cement addition caused a higher level of precipitation reactions, which allows the contaminant to remain in solution and be solubilized in acid environment. In this sense, the condition which was most favorable for the design of an reactive and impermeable barrier was 0% cement for Pb and 1% cement for Cd, which provided the highest Rd and Kd values, considering the contaminant at its most acidic condition. Regarding the parameters Rd and Kd magnitudes, Pb showed higher values than Cd, indicating less mobility.

Mittels künstlichen neuronalen Netzen wurden die in den rekultivierten Tagebaukippen im Nordraum Lausitz (Tagebaue Schlabendorf und Seese) auftretenden Geländedeformationen infolge Bodenverflüssigung für die Jahre 2009 - 2013 als Zeitreihe modelliert. Das Modell ist in der Lage, grob die zeitliche Entwicklung und exakt die räumliche Lage des in den Kippen auftretenden Gefährdungspotenzials nachzuvollziehen und als Funktion des sich ändernden Grundwasserspiegels und der sich ändernden Oberflächenmorphologie in die Zukunft zu prognostizieren. Das Modell zeigt dynamisch das Entstehen neuer Risikoflächen in bisher scheinbar stabilen Bereichen des Untersuchungsgebietes. Die Korrektheit des Modells wurde mittels verschiedener Tests geprüft sowie anhand einer Prognoserechnung für das Jahr 2014 und des Vergleichs mit den real in 2014/2015 gegangenen Ereignissen nachgewiesen. Folgende Gefährdungsfaktoren wurden ermittelt: Destabilisierend wirken eine möglichst einförmige Lithologie folgender Zusammenset-zung: 31 % Feinsand, 34 % Mittelsand, 31 % Grobsand, 3 % Schluff, < 1 % Kies, < 1 % Kalk, < 1 % Ton, < 1 % Kohle, kf-Werte zwischen 10-4 und 10-4,5 m/s, ein Grundwasserflurabstand bei 3,45 m (Medianwert), möglichst hohe Gradienten der nicht lithologisch kontrollierten Parameter: Tagebauoberfläche, Grundwasseroberfläche, Grundwasserflurabstand und Mächtigkeit der gesättigten Kippe. Stabilisierend wirken vor allem eine möglichst große Heterogenität der Lithologie auf kleinem Raum (möglichst hohe Gradienten der lithologisch kontrollierten Parameter (z.B. Kiesgehalt, Sandgehalt, Tongehalt, Kohlegehalt)), ein möglichst geringer Sandanteil, möglichst hohe Anteile an Kies, Schluff, Ton, Kalk, bzw. Kohle, ein möglichst großer Grundwasserflurabstand sowie möglichst geringe Gradienten der nicht lithologisch kontrollierten Parameter: Tagebauoberfläche, Grundwasseroberfläche, Grundwasserflurabstand, Mächtigkeit der gesättigten Kippe sowie wechselnde kf-Werte 10-7 bzw. >10-2 m/s. Für die Bearbeitung wurden ausschließlich die bei der LMBV vorhandenen bzw. laufend flächendeckend erhobenen Daten genutzt: Lage des Grundwasserspiegels, Relief der Tagebauoberfläche, Liegendes der Kippe, geologische Daten der Vorfeldbohrungen. Das Modell kann als dynamisches Instrument zum Risikomanagement vor bzw. während der Sanierungsmaßnahmen genutzt werden. Mittels der Variation der prozesskontrollie-renden Parameter können die geotechnischen Auswirkungen verschiedener Sanierungsszenarien (z.B. Gestaltung der Tagebauoberfläche, Schüttung der Kippen, Grundwasseranstieg) auf die Stabilität der Kippen prognostiziert werden. / Geotechnical events (terrain deformation due to soil liquefaction) in lignite mining waste rock piles of the northern Lausitz area (opencast pits Schlabendorf and Seese), have been modeled as time series for the years 2009 – 2013 by using artificial neural networks. The model has clearly recognized the influences of various lithological and non-lithological controlled parameters on the occurrence of geotechnical events, and these have been quantified and weighted in terms of their importance. The model is able to predict the tem-poral evolution and the exact spatial location of the events occurring in the dumps as a function of changing groundwater levels and surface morphology. The model shows dynamically the emergence of new risk areas in hitherto seemingly stable areas. The correctness of the model was confirmed by means of various tests and its predictive success was demonstrated through forecasting of events for the years 2014 and 2015 and their comparison with the observed events of those years. The following main risk factors were identified: Important destabilizing factors are a monotonous lithology with the following composition: 31% fine sand, 34% medium sand, 31% coarse sand, 3% silt, <1% gravel, <1% lime, <1% clay, <1% coal, kf-values between 10-4 and 10-4.5 m/s, a surface to groundwater distance of 3.45 meters (median value), high gradients of non-lithological controlled parameters: waste dump surface, groundwater level, depth to groundwater and thickness of saturated dump. 2. Important stabilizing factors are a high heterogeneity of lithology (high gradients of the lithological controlled parameters: e.g. gravel content, sand content, clay content, carbon content), a low proportion of sand in the dump composition, high proportions of gravel, silt, clay, lime, or coal, a high depth to groundwater, low gradients of non-lithological controlled parameters: open pit surface, groundwater surface, depth to groundwater, thickness of saturated dump, strongly changing kf values between 10-7 and 10-2 m/s. The model can be used as a dynamic tool for risk management before and during the re-habilitation of lignite waste dumps, and for constructing stable waste dumps. By means of varying the model parameters (e.g. design of the dump surface, composition of dumped rocks, rising groundwater) the geotechnical effects of dump design and remediation scenarios can be predicted.

Cemented paste backfill (CPB) is a novel technology developed in the past few decades to better manage mining wastes (such as tailings) in environmentally friendly way. It has received prominent interest in the mining industry around the world. In this technology, up to 60% of the total amount of tailings is reused and converted into cemented construction material that can be used for secondary support in underground mine openings (stopes) and to maximize the recovery of ore from pillars. CPB is an engineered mixture of tailings, water, and hydraulic binder (such as cement), that is mixed in the paste plant and delivered into the mine stopes either by gravity or pumping. During and after placing it into the mine stopes, the performance of CPB mainly depends on the role of the hydraulic binder, which increases the mechanical strength of the mixture through the process of cement hydration. Similar to other fine-grained soils undergoing cementations, CPB’s behavior is affected by several conditions or factors, such as cement hydration progress (curing time), chemistry of pore water, mixing and curing temperature, and filling strategy. Also, it has been found that fresh CPB placed in the mine stopes can be susceptible to many geotechnical issues, such as liquefaction under ground shaking conditions. Liquefaction-induced failure of CPB structure may cause injuries and fatalities, as well as significant environmental and economic damages. Many researches studied the effect of the aforementioned conditions on the static mechanical behavior of CPB. Other researches have evaluated the liquefaction behavior of natural soils and tailings (without cement) during cyclic loadings using shaking table test technique. Only few studies investigated the CPB liquefaction during dynamic loading events using the triaxial tests. Yet, there are currently no studies that addressed the liquefaction behavior of CPB under the previous conditions by using the shaking table technique. In this Ph.D. study, a series of shaking table tests were conducted on fresh CPB samples (75 cm × 75 cm ×70 cm), which were mixed and poured into a flexible laminar shear box (that was designed and build for the purpose of this research). Some of these shaking table tests were performed at different maturity ages of 2.5 hrs, 4.0 hrs, and 10.0 hrs, to investigate the effect of cement hydration progress on the liquefaction potential of CPB. Another set of tests were conducted to assess the effect of the chemistry (sulphate content) of the pore-water on the cyclic response of fresh CPB by exposing cyclic loads on couple of CPB models that contain different concertation of sulphate ions of 0.0 ppm and 5000 ppm. Moreover, as part of this study, series of shaking table test was conducted on CPB samples that were prepared and cured at different temperatures of 20oC and 35oC, to evaluate the effect of temperature of the cyclic behavior of CPB. Furthermore, the effect of filling strategy on the cyclic behavior of fresh CPB was assessed by conducting set of shaking tables tests on CPB models that were prepared at different filling strategies of continuous filling, and sequential or discontinuous (layered) filling. The results obtained show that CPB has different cyclic behavior and performance under these different conditions. It is observed that the progress of cement hydration (longer curing time) enhances the liquefaction resistance of CPB, while the presence of sulphate ions diminishes it. It is also found that CPB mixed and cured in low temperature is more prone to liquefaction than those prepared at higher temperatures. Moreover, the obtained results show that adopting the discontinuous (layered) filling strategy will improve the liquefaction resistance of CPB. The finding presented in this thesis will contribute to efficient, cost effective and safer design of CPB structures in the mine areas, and will help in minimizing the risks of liquefaction-induced failure of CPB structures.

Gruvavfall från gruvbrytning kan utgöra stor problematik i och med läckage av metaller till omgivande miljö om gruvavfallet hanteras felaktigt. Från Falu Gruva har det brutits främst koppar och zink i över 1000 år innan det stängde. Gruvavfallet består av sulfidmineral som är vanligt brytningsmalm och besvärligt ur miljösynpunkt. Vid kontakt med syre oxiderar mineralen vilket kan öka metallernas löslighet. Gruvavfallet har använts som fyllnadsmaterial, som byggmaterial och en del ligger öppet i och omkring Falun. Då det i framtiden väntas kraftigare och mer intensiv nederbörd samt en högre temperatur behövs det fastställas hur dessa parametrar påverkar gruvavfallet. Tidigare forskning visar att det finns samband mellan metallhalter och nederbörd samt temperatur. Syftet med denna rapport är att ingående undersöka utsläppet av metaller vid Slussens mätstation som uppstått till följd av Falu Gruvas aktivitet i området. Rapporten avser också att undersöka hur metallhalterna kan komma att förändras i framtiden med ökad nederbörd och temperatur. Bly-, kadmium-, koppar- och zinkhalter i vatten har undersökts och analyserats vid Slussens mätstation med hjälp av regression under tidsperioden 1990–2020. Resultatet visar att samtliga metallhalter har sjunkit sedan gruvverksamheten stängde samt efter de saneringsåtgärderna som var pågående under cirka tio års tid. Trenden för metallhalter hölls övergripande stabil men på senare år fanns en ökande trend för bly, kadmium och zink medan koppar var den metall som uppvisade minskande trend hela tidsperioden. Samtliga metaller har säsongsvariationer med högst metallhalter under sommar och höst och alla metaller överskrider också årsmedelvärden i inlandsytvatten, vilket är anmärkningsvärt. Det fanns positiva signifikanta samband mellan temperatur och metallhalter där bly hade högsta sambandet och zink det lägsta. Det fanns även positiva signifikanta samband mellan nederbörd och metallhalter där bly hade det högsta sambandet och koppar det lägsta. / Mining waste from mining can be a major problem due to leakage of metals to the surrounding environment if the waste is handled incorrectly. From Falu Mine, copper and zinc have been mined mainly for over 1000 years before it closed and the mine waste consists of sulphide mineral. Sulphide mineral is a common mining ore and troublesome from an environmental point of view. Upon contact with oxygen, the mineral oxidizes, which can increase the solubility of the metals. The waste has been used as filling material, as building material and some is open in and around Falun. As heavier and more intense precipitation and a higher temperature are expected in the future, it is necessary to determine how these parameters affect the mining waste. Previous research shows that there is a connection between metal levels and precipitation as well as temperature. The purpose of this report is to thoroughly investigate the emissions of metals at Slussen's measuring station that arose as a result of Falu Gruva's activity in the area. The report also investigate how metal levels may change in the future with increased precipitation and temperature. Lead, cadmium, copper and zinc concentrations in water have been investigated and analysed at Slussen's measuring station using regression of the metal leaching from the period 1990–2020. The results show that all metal concentrations have fallen since the mining operations closed and after the decontamination measures that were ongoing for about ten years. The trend of metal levels is generally stable, but in recent years there has been an increasing trend for lead, cadmium and zinc, while copper was the metal that showed a declining trend throughout the period. All metals have seasonal variations with the highest metal contents during summer and autumn and all metals exceed annual average values ​​in inland surface water, which is remarkable. There were positive significant correlations between temperature and metal concentrations where lead had the highest correlation and zinc the lowest. There were also positive significant correlations between precipitation and metal levels where lead had the highest correlation and copper the lowest.