Tesi sul tema "Golo River"
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Skyles, Emilee M. "Alluvial Geochronology and Watershed Analysis of the Golo River, Northeastern Corsica, France". DigitalCommons@USU, 2013. https://digitalcommons.usu.edu/etd/2045.
Testo completoMorse, Kathryn Taylor. "The nature of gold : an environmental history of the Alaska/Yukon gold rush /". Thesis, Connect to this title online; UW restricted, 1997. http://hdl.handle.net/1773/10468.
Testo completoMcGowan, Krista I. "Geochemistry of alteration and mineralization of the Wind River gold prospect, Skamania County, Washington". PDXScholar, 1985. https://pdxscholar.library.pdx.edu/open_access_etds/3586.
Testo completoBornstein, Sara. "Women of the 1898 Alaska-Klondike Gold Rush". Diss., Connect to the thesis, 2009. http://hdl.handle.net/10066/3588.
Testo completoKnight, John Bruce. "A microprobe study of placer gold and its origin in the lower Fraser River drainage basin, B.C". Thesis, University of British Columbia, 1985. http://hdl.handle.net/2429/24829.
Testo completoScience, Faculty of
Earth, Ocean and Atmospheric Sciences, Department of
Graduate
Day, Stephen John. "Sampling stream sediments for gold in mineral exploration, southern British Columbia". Thesis, University of British Columbia, 1988. http://hdl.handle.net/2429/27869.
Testo completoScience, Faculty of
Earth, Ocean and Atmospheric Sciences, Department of
Graduate
Ramessar, Candice Rowena. "Water is More Important than Gold: Local Impacts and Perceptions of the 1995 Omai Cyanide Spill, Essequibo River, Guyana". Thesis, Virginia Tech, 2003. http://hdl.handle.net/10919/34552.
Testo completoMaster of Science
Kwiatkowski, Derrick A. "The prediction of a modern gold mine's contaminant dispersion and deposition in a river mixing zone". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0016/MQ54512.pdf.
Testo completoMacKenzie, Douglas James, e n/a. "Structural controls on orogenic gold mineralisation in the Otago Schist, New Zealand and the Klondike Schist, Canada". University of Otago. Department of Geology, 2008. http://adt.otago.ac.nz./public/adt-NZDU20080704.085108.
Testo completoMcCluskey, Kara M. "Using reclaimed water for golf course irrigation to improve water resource management in the Lower Arkansas River Basin". Thesis, Kansas State University, 2015. http://hdl.handle.net/2097/19053.
Testo completoCivil Engineering
David R. Steward
With an increasing population, municipalities in the United States are struggling to secure safe, reliable water sources for future water demands. Alternative water sources are being considered to improve the overall water management picture. Wastewater reuse, reusing wastewater effluent for beneficial purposes, is an alternative water source that is gaining popularity in the United States. In this study a theoretical framework was developed to enable a region to quickly assess the feasibility of reusing wastewater for irrigation needs. Three criteria were established for the framework; they are, regulations and guidelines for reuse, adequate flow ratio, and cost benefit analysis. As a region moves through the framework and criteria a list of feasible wastewater facilities and end users are established. A model was developed for the cost benefit analysis based on regional input. As regulatory frameworks and economic factors evolve over time the model can be updated to assess how these changes will affect water reuse in a region. The model will provide a useful tool for a region to integrate wastewater reuse into the water resource management process. The Lower Arkansas River Basin (LARK) was highlighted by the Kansas Water Office as a region that should investigate the role of reuse in water conservation. Results from this report indicate 963 million gallons per year (MG/yr) of wastewater effluent could feasibly be used to irrigate 9 hole and 18 hole golf courses in the region. The results determined that any 18 hole golf course within a 15.9 mile radius of a wastewater treatment facility in the LARK could payback the capital costs for wastewater reuse within 10 years. This information is a useful tool for the region to start the discussion for implementing wastewater reuse in the region. The results from this report indicate wastewater reuse for golf course irrigation is economically feasible in the LARK. Establishing a safe reliable water source for the future is paramount to the future of Kansas. Future research is needed to determine how the wastewater diversion affects the environmental balance of the permitted discharge location.
Marshall, Daniel Patrick. "Claiming the land : Indians, goldseekers, and the rush to British Columbia". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ48669.pdf.
Testo completoNAKAHIRA, SILVIO. "Utilizacao do Au-198 com marcacao superficial no estudo do transporte solido por arraste de fundo em canal natural de grande porte". reponame:Repositório Institucional do IPEN, 1987. http://repositorio.ipen.br:8080/xmlui/handle/123456789/9890.
Testo completoMade available in DSpace on 2014-10-09T14:10:07Z (GMT). No. of bitstreams: 1 12894.pdf: 3496583 bytes, checksum: 5149c2b62809152eac0978234cafe18d (MD5)
Tese (Doutoramento)
IPEN/T
Escola Politecnica, Universidade de Sao Paulo - POLI/USP
Zigic, Sasha, e n/a. "A Methodology to Calculate the Time-Varying Flow Through a Hydraulic Structure Connecting Two Water Bodies". Griffith University. School of Engineering, 2005. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20060111.145655.
Testo completoHamman, David. "A holistic view on the impact of gold and uranium mining on the Wonderfonteinspruit / David Hamman". Thesis, North-West University, 2012. http://hdl.handle.net/10394/8155.
Testo completoPeters, Gregory Merrill Deschaine. "Forever wild journeys through the North Fork /". Diss., [Missoula, Mont.] : The University of Montana, 2009. http://etd.lib.umt.edu/theses/available/etd-12292009-115313.
Testo completoSaup, Casey Morrisroe. "Biogeochemical Cycling in Pristine and Mining-Impacted Upland Fluvial Sediments". The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1593664378874682.
Testo completoGroeneveld-Meijer, Averill. "Manning the Fraser Canyon gold rush". Thesis, 1994. http://hdl.handle.net/2429/5338.
Testo completoBeyreis, David Charles. "Middle-class masculinity and the Klondike gold rush". 2007. http://digital.library.okstate.edu/etd/umi-okstate-2232.pdf.
Testo completoReynolds, Michael J. "Thriving at the edges : agency, identity, and adaptation in the Brazilian Amazon /". 2003. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pqdiss&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&rft_dat=xri:pqdiss:3097152.
Testo completoAbolit, Lia Denelle. "Fairway to Greenway: transformation from golf course to a sustainable community in the Seine River corridor". 2013. http://hdl.handle.net/1993/22084.
Testo completoEnkhjin, Altanbulag, e Altanbulag Enkhjin. "Evaluate the Negative Impacts of Gold Mining for Environment by Using Satellite Data on Ongi River, Mongolia". Thesis, 2019. http://ndltd.ncl.edu.tw/handle/9268cu.
Testo completo大葉大學
環境工程學系研究所
107
The purpose of the study is to investigate the disturbed area of the gold mining by using satellite data around the Ongi river, Mongolia. The reason for the study is that the Ongi River plays a significant role concerning the ecological balance of Gobi area. In Mongolia, the mining sector is rapidly developing as one of key economic indicators of country, however, as known mining always induced a negative impact on environment, too. In particular, gold mining is underway and large area of land caused damage from mineral extraction. As consequence, the regional ecological balance is lost and difficult problems happened to animal husbandry and farming activites. Many small rivers have disappeared resulting a serious damage to environment. The major pollution for the rivers from mining is dirt wash accompanied with large quantities consumption of water, especially for gold mining. Mining companies declared that washing method is on nature and “eco-friendly” only without using chemical methods. However, 1m³ dirt washing with 4-12 tons of water consumption will cause a long-term damage to the environment, finally cause destruction of the river. Evidences show that rivers from Khangai to Gobi dried up soon resulting Gobi desertification. Naturally, there is low rainfall and few water yields in Mongolia causes poor natural rehabilitation of land. However, 40% of the total land area has been granted exploration licenses will cause impacts on ecological balance for a long run. Serious of landsat satellite data were used to detect the developing of disturbed land. Comparing the period between 1986 and 2016 a rapid developing damage from 2.79 hectares to 703.9 hectares is shown on Ongi River.
Fonseca, Ana L. "Origin of carbonate hosted gold rich replacement deposits and related mineralization styles in the Ketza River deposit, Yukon Territory". Thesis, 1998. http://hdl.handle.net/2429/8406.
Testo completoDiringer, Sarah Elisa Axelroth. "Distribution, Transport, and Control of Mercury Released from Artisanal and Small-Scale Gold Mining (ASGM) in Madre de Dios, Peru". Diss., 2016. http://hdl.handle.net/10161/13363.
Testo completoMercury (Hg) is a globally circulating heavy metal released through both natural and anthropogenic sources. The largest anthropogenic source of mercury to the global atmosphere is artisanal and small-scale gold mining (ASGM). During the ASGM process, miners add elemental mercury to large quantities of sediment or soil in order to create gold-mercury amalgams that separate alluvial gold from the remaining geological host material. Miners then heat the amalgam using a blowtorch or similar device to separate the mercury and gold, exposing themselves to mercury vapor and releasing mercury to the environment. Following amalgam heating, mercury can deposit into aquatic ecosystems. There, anaerobic microorganisms can convert mercury to methylmercury (MeHg), a potent neurotoxin that rapidly accumulates in aquatic food webs. A high concentration of MeHg in fish poses serious human health risks, especially to pregnant women and children.
In Peru’s Region of Madre de Dios (MDD), mercury use for ASGM is widespread due to increasing global demand for gold. This region in the tropical Amazon is one of the world’s most biodiverse ecosystems and home to more than 150,000 Indigenous and non-Indigenous people, 40% of whom live below the poverty level. Recently, people living in the region have become more aware of negative impacts of Hg pollution through popular press. However, there is lack of controlled scientific studies to examine the environmental impacts of Hg from ASGM and subsequent exposures to surrounding communities.
This dissertation addresses four questions in order to better understand how mercury from ASGM impacts environmental health in Madre de Dios: (1) How is mercury distributed along the Madre de Dios River in areas of active ASGM activity, and what is the risk for mercury exposure to downstream communities? (2) How does land use change associated with ASGM activity affect soil-mediated mercury transport in the Colorado River, Madre de Dios, Peru? (3) Can sulfurized carbon be manufactured in a feasible way for developing countries and used to capture mercury during ASGM amalgam burning? (4) What is the mercury methylation potential of easy-to-manufacture spent, sulfurized carbon sorbents?
Despite significant information on the direct health impacts of mercury to ASGM miners, the impact of mercury contamination on downstream communities has not been well characterized, particularly in Madre de Dios. In this area, ASGM has increased significantly since 2000 and has led to substantial political and social controversy. The second chapter of this dissertation examines the spatial distribution and transport of mercury through the Madre de Dios River with distance from ASGM activity. It also characterizes risks for dietary mercury exposure to local residents who depend on fish from the river. River sediment, suspended solids from the water column, and fish samples were collected in 2013 at 62 sites near 17 communities over a 560 km stretch of the Madre de Dios River and its major tributaries. In areas downstream of know ASGM activity, mercury concentrations in sediment, suspended solids and fish within the Madre de Dios River were elevated relative to locations upstream of mining. Fish tissue mercury concentrations were observed at levels representing a public health threat, with greater than one-third of carnivorous fish exceeding the international health standard of 0.5 mg/kg. This research demonstrates that communities located hundreds of kilometers downstream of ASGM activity, including children and indigenous populations who may not be involved in mining, are at risk of dietary mercury exposure that exceed acceptable body burdens.
This research involved extensive field sampling in an active mining region and indicated suspended particulate transport may be an important source of mercury from mining areas to downstream communities. Chapter three of this research focused on understanding how land use changes can influence soil and sediment transport from mining regions. Within the MDD, a large portion of mining in concentrated within the Colorado River watershed. In the Colorado River watershed, mining and deforestation have increased dramatically since the 1980s, largely concentrated in the Puquiri subwatershed. Field sampling in Feb 2015 identified a strong correlation between Hg and suspended solids concentrations, with especially high suspended solids concentrations downstream of ASGM activity. This supported the hypothesis that Mercury transport in this region is facilitated by soil mobilization and runoff. In order to understand how ASGM activity in the Puquiri affects sediment mobilization from the watershed over time, we employed a watershed-scale soil mobilization model using satellite imagery from 1986 to 2014. The model estimated that soil mobilization in the Colorado River watershed increased by 2.5 times during the time period, and increased by six times in the Puquiri subwatershed, leading to between 10 and 60 kg of mercury mobilized in 2014. If deforestation continues at its current exponential rate through 2030, soil and heavy metal mobilization may increase by five times. This research shows that deforestation associated with ASGM in the Colorado River watershed can exacerbate soil mobilization and mercury contamination. While the impacts of mercury and deforestation are often considered separately, here we studied how deforestation associated with ASGM in the Madre de Dios region can significantly increase soil mobilization and mercury transport to downstream communities.
With a substantial portion of mercury releases coming from a non-industrialized process in developing countries, low-cost and low-tech mercury capture is becoming increasingly necessary. While impregnated activated carbon sorbents are well studied for mercury-capture in developed countries and large industrialized settings, there exist few suitable low-cost alternatives for mercury capture from artisanal and small-scale gold mining (ASGM) in developing countries. Chapter four sought to develop an easy-to-manufacture carbon sorbent using elemental sulfur and activated carbon or hardwood-based biochar for potential use during ASGM gold-amalgam heating. Consumer-grade sulfur powder was melted on granular activated carbon or hardwood biochar in a process feasible for a cook stove setting. Activated carbon and biochar were successfully sulfurized to more than 5% sulfur by weight using powdered, elemental sulfur. The sorbent products were tested for elemental mercury sorption from an air gas stream at room temperature. The sulfurized activated carbon achieved higher elemental mercury adsorption capacity in air stream (500 μg Hg m-3, 2 L min-2) relative to unsulfurized activated carbon and sulfurized biochar. Sorption isotherms were used to examine the sorption mechanism, and indicated that likely a pseudo first order reaction was occurring. This research provides a possible option for mercury control by modifying established mercury capture technologies to be easy to manufacture, locally available, and less hazardous to produce.
In Chapter 5 of this research, the sulfurized sorbents were examined further to understand methylation potential in sediment slurries. Anaerobic sediment slurries were constructed to examine methylmercury (MeHg) production of spent sorbents. Five sorbent types with approximately 10 mg/kg Hg each were added to slurries at 5 % by mass. Dissolved mercury was used as a control to simulate atmospheric deposition or highly reactive mercury. After a 5 d incubation at room temperature, MeHg production was ten times greater with low-technology sulfurized sorbents as compared to activated carbon or biochar alone. Sulfurized sorbents leached significantly more mercury than their non-sulfurized counterparts during desorption experiments and led to greater dissolved mercury concentrations. This research shows that low-cost mercury-contaminated sorbents can have unintended consequences with increased MeHg production and potential for more harm to local communities than atmospheric release.
Mercury releases from ASGM are expected to grow, leading to higher concentrations of mercury in the atmosphere that may affect ecosystems throughout the globe. Understanding the importance of mercury from ASGM to toxicity and accumulation requires in depth research on mercury transformations and MeHg production associated with ASGM. This research examines mercury distribution and transport from ASGM active regions. It identifies that deforestation, erosion, and particulate transport play important roles in overall mercury transport, leading to hazardous mercury concentrations downstream of ASGM activity. Effective point-of-use mercury capture technologies would dramatically decrease the mass of mercury released to the environment. The final chapters of this research serve as a proof of concept for using sulfurized activated carbon for mercury capture in developing countries.
Our research team has built strong relationships with several governmental and non-governmental organizations in Peru who will aid in distributing information. This research will provide invaluable environmental health information to residents, inform political intervention, and reveal a new potential avenue for low-cost mercury control.
Dissertation
Ali, Khaled. "Application of GeoDAS and other advanced GIS technologies for modeling stream sediment geochemical distribution patterns to assess gold resources potential in Yunnan Province, South China /". 2005. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pqdiss&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&rft_dat=xri:pqdiss:MR19718.
Testo completoTypescript. Includes bibliographical references (leaves 136-151). Also available on the Internet. MODE OF ACCESS via web browser by entering the following URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pqdiss&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&rft_dat=xri:pqdiss:MR19718
Rosenblatt, David Louis. "Regional versus federal interests in the development of Brazil's Amazon region". 1992. http://catalog.hathitrust.org/api/volumes/oclc/33002386.html.
Testo completoBatbayar, Gunsmaa. "Chemical water quality in Selenge River Basin in Mongolia: spatial-temporal patterns and land use influence". Thesis, 2018. http://hdl.handle.net/11858/00-1735-0000-002E-E4D4-7.
Testo completoDalton, Lindsay Paige. "Place of women: exploring the role of place in shaping self-employment as a livelihood strategy for women in the resource dependent community of Gold River, B.C". Thesis, 2006. http://hdl.handle.net/1828/2359.
Testo completoMuruven, Dean Nalandhren. "An evaluation of the cumulative surface water pollution within the consolidated main reef area, Roodepoort, South Africa". Diss., 2011. http://hdl.handle.net/10500/6299.
Testo completoEnvironmental Sciences
M.Sc. (Environmental Science)
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