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Tytuł:
Distribution of Mercury in Soil, Water, and Vegetable Fern in a Former Gold Mining Area – Evidence from Nagan Raya Regency, Aceh Province, Indonesia
Autorzy:
Nisah, Khairun
Muslem, Muslem
Ashari, Tengku Muhammad
Afkar, Majral
Iqhrammullah, Muhammad
Powiązania:
https://bibliotekanauki.pl/articles/2173338.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
Aceh
artisanal gold mining
mercury
fern
Pityrogramma calometanos
Opis:
The mercury contamination associated with the former intense illegal gold mining activities is suspected in the watershed of Krueng Cot Satu, Nagan Raya Regency, Aceh Province, Indonesia. The aim of this study was to evaluate the mercury contamination residue in the water, soil, and vegetable fern (Pityrogramma calometanos (L)) The samples were collected from locations in the already closed artisanal gold mining sites. The sampling locations were purposively determined by considering their closeness to the previous gold mining activities sites. The content of mercury was analyzed using flow injection for atomic spectroscopy – atomic absorption spectroscopy. The method used was validated by linearity, Limit of Detection (LoD), Limit of Quantification (LoQ), Relative Standard Deviation (RSD), and recovery. The validation test showed that this method is well linear, sensitive, accurate, and precise with a correlation coefficient, LoD, LoQ, RSD and recovery of 0.9999, 0.0477 μg/L, 0.1447 μg/L, 2.96% and 95–105%, respectively. Herein, it was found that the concentrations of mercury contents in the water samples were below the detectable range. However, a high range of mercury concentration of 0.236 – 0.328 μg/g was found in soil, with the highest concentration obtained in the sample collected from the riverbank. The fern sample collected near the riverbank contained mercury in all its parts and concentrated in the root (0.408 μg/g in the leaves, 0.276 μg/g – stalks, and 9.994 μg/g – roots). Meanwhile, the absence of mercury contamination was obtained in the leaves and stalks of the fern samples collected far from the riverbank. The roots, however, were detected with mercury contamination with the highest concentration reaching 27.660 μg/g. Despite its disappearance in the water, mercury contamination residue from the former artisanal gold mining activities still could be traced in the soil and heavy metal accumulating plant – P. calometanos (L).
Źródło:
Journal of Ecological Engineering; 2022, 23, 8; 30--39
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
"Surviving and growing up with illegal status": the analysis of socio-economic household, potential conflict, the environmental damage, and vulnerability of local community to disaster
Autorzy:
Syahnur, Sofyan
Diantimala, Yossi
Powiązania:
https://bibliotekanauki.pl/articles/2073899.pdf
Data publikacji:
2021
Wydawca:
Główny Instytut Górnictwa
Tematy:
illegal gold mining
socio-economic
conflict
environmental damage
vulnerable to disaster
artisanal gold mining
small-scale gold mining
nielegalne wydobycie złota
konflikty
szkody w środowisku
podatność na katastrofy
rzemieślnicze wydobycie złota
wydobycie złota na małą skalę
Opis:
This study aims to analyze, from social-economics and environmental perspectives, how illegal gold mining survives and grows with its illegal status. Generally, illegal mining has a positive impact on the socio-economy of all parties involved. However, mining activities cause environmental damage and pollution so that the local community is vulnerable to disaster and potential conflict. This research was conducted at an illegal mining site in Aceh, the western province of Indonesia. To describe the primary data, it employs a descriptive qualitative method. The purposive sampling method is used to select key informants. The results show an increasing income of all stakeholders involved. To minimize environmental damage and pollution, illegal mining uses a very simple - but very environmentally friendly-tool, „Asbhuk”, which does not harm the sustainability of the natural environment, especially the use of wells and mountain springs. Nevertheless, natural disasters often occur in the mining area, such as overflowing rivers and landslides caused by heavy rainfall. It is a negative impact from changes in the structure of mining land, forest encroachment, and the expansion of the river. There is no significant conflict between direct and indirect parties engaged in illegal mining activities. The direct parties desire this mining activity to be conducted by artisanal and small groups.
Źródło:
Journal of Sustainable Mining; 2021, 20, 3; 157--177
2300-1364
2300-3960
Pojawia się w:
Journal of Sustainable Mining
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Identifying an efficient bacterial species and its genetic erosion for arsenic bioremediation of gold mining soil
Autorzy:
Neeratanaphan, L.
Tanee, T.
Tanomtong, A.
Tengjaroenkul, B.
Powiązania:
https://bibliotekanauki.pl/articles/205026.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
arsenic polluted soil
gold mining soil
efficient bacteria
genetic erosion
Opis:
To improve bioremediation of arsenic (As) contamination in soil, the use of microorganisms to efficiently reduce As and their assessment of genetic erosion by DNA damage using genomic template stability (GTS) evaluation and using RAPD markers were investigated. The five sites examined for microorganisms and contaminated soils were collected from affected gold mining areas. The highest As concentration in gold mining soil is 0.72 mg/kg. Microorganism strains isolated from the gold mining soil samples were tested for As removal capacity. Two bacterial isolates were identified by 16S rRNA gene sequence analysis and morphological characteristics as Brevibacillus reuszeri and Rhodococcus sp. The ability to treat As in nutrient agar (NA) at 1,600 mg/L and contaminated soil samples at 0.72 mg/kg was measured at 168 h, revealing more efficient As removal by B. reuszeri than Rhodococcus sp. (96.67% and 94.17%, respectively). Both species have the capacity to remove As, but B. reuszeri shows improved growth compared to the Rhodococcus sp. B. reuszeri might be suitable for adaptation and use in As treatment. The results are in agreement with their genetic erosion values, with B. reuszeri showing very little genetic erosion (12.46%) of culture in As concentrations as high as 1,600 mg/L, whereas 82.54% genetic erosion occurred in the Rhodococcus sp., suggesting that Rhodococcus sp. would not survive at this level of genetic erosion. Therefore, B. reuszeri has a high efficiency and can be used for soil As treatment, as it is capable to tolerate a concentration of 0.72 mg/kg and as high as 1,600 mg/L in NA.
Źródło:
Archives of Environmental Protection; 2016, 42, 3; 58-66
2083-4772
2083-4810
Pojawia się w:
Archives of Environmental Protection
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Akcje kopalni złota jako instrument inwestowania kapitału
Autorzy:
Mamcarz, Katarzyna
Powiązania:
https://bibliotekanauki.pl/articles/611170.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Tematy:
explorers
gold mines
gold-mining stocks
index of gold mining-stocks
investment risk
leverage of gold price
spółki eksploracyjne, kopalnie złota, akcje kopalni złota, indeks akcji kopalni złota, ryzyko inwestycyjne, dźwignia ceny złota
Opis:
In the gold-mining stocks market there is a great number of companies, from explorers to gold mines. The stocks of these companies give investors ample opportunities to invest capital, but they are also associated with high risk. This stems from the specificity of mining industries and the relationship between prices of gold-mining stocks and gold prices in world markets. This relationship is expressed by the gold price leverage effect. On the basis of the analysis of empirical data it should be said that this effect occurred although this did not apply to the whole period investigated.
Artykuł nie zawiera abstraktu w języku polskim
Źródło:
Annales Universitatis Mariae Curie-Skłodowska, sectio H – Oeconomia; 2014, 48, 1
0459-9586
Pojawia się w:
Annales Universitatis Mariae Curie-Skłodowska, sectio H – Oeconomia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Consequences of Mercury Used by Artisanal and Small-Scale Gold Mining Processes a Case of River Nile State Sudan
Autorzy:
Ahmed, Ali M.A.
Purwanto, Purwanto
Sunoko, Henna Rya
Powiązania:
https://bibliotekanauki.pl/articles/124413.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
artisanal gold mining
small-scale gold mining
workers occupationally exposed
WOE
residents in surrounding communities
RSC
distribution of mercury concentration
surface soil
surface water
meteorological factors
topographical factors
Opis:
On the discovery of gold reserves in 14 states in Sudan, traditional gold mining suddenly started to flourish and hundreds of thousands of laymen became engaged in gold extraction. The new source of revenue generation added much to the empty treasury and the loss in petroleum revenue due to cessation of the south in 2011 could thus be compensated. Since gold extraction by artisanal and small-scale gold mining does not require much finance or advanced technology, it suited unskilled workers and many young people found their way into the new business. Although gold extraction generates high revenues, the use of mercury in gold extraction poses much threat to the environment and general health of miners and the surrounding areas. The research tries to investigate the effects of traditional gold mining in Alebedia area, Berber Locality in the River Nile State. The investigation includes A/ the effects of extraction methods on the environment and general health. B/ the level of education and its distribution within the miners and how it affected the awareness of the miners about the dangers of mining activities. C/ the period of stay that miners spend in the mining area its contribution on the awareness about the dangers and diseases inflicted on the miners, D/ the effects of traditional gold mining activities on natural environmental impacts and E/ the effects of the meteorological and topographical factors, the distribution and concentration of mercury in the area and their effects on the environment and general health. The research adopted the techniques of using random sampling and quantitative qualitative in addition to the analytical techniques. The research finally concluded that traditional gold mining has positive effects on the economic side and negative effects on the environment and general health.
Źródło:
Journal of Ecological Engineering; 2019, 20, 2; 106-115
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sustainable development in Ghana's gold mines: Clarifying the stakeholder's perspective
Autorzy:
Dery Tuokuua, Francis Xavier
Kpinpuo, Stephen Debar
Hinson, Robert Ebo
Powiązania:
https://bibliotekanauki.pl/articles/92098.pdf
Data publikacji:
2019
Wydawca:
Główny Instytut Górnictwa
Tematy:
human capital
sustainable development
gold mining
stakeholders
Ghana
kapitał Ludzki
rozwój zrównoważony
wydobycie złota
interesariusze
Opis:
Using semi-structured interviews and focus group discussions (FGDs), this study examined critical stakeholder's perceptions, experiences and competence in assuring the sustainable management of Ghana's major gold mines. The investigation was inspired by a synthesis of the United Nation's Sustainable Development Goals (SDGs) adopted by the global community in September 2015; it places human resource capacity at the center of a sustainability struggle between local and international businesses. The findings of this study encompass two opposing but interesting perspectives. On the one hand, the study showed that sustainable development is understood differently by stakeholders within the gold mining sector in Ghana, which is why gold mining companies employ different approaches in their pursuit of sustainability objectives. On the other hand, the study revealed that, as mining activities are similar across different mining companies, common understanding and operation of sustainable development in the country's gold mines is a more practical approach to sustaining mining operations. This study further revealed that to facilitate the effective implementation of sustainable development within Ghana's gold mines and to ensure its alignment with SDGs, a regulatory framework is required and this should be developed based on the input of stakeholders.
Źródło:
Journal of Sustainable Mining; 2019, 18, 2; 77-84
2300-1364
2300-3960
Pojawia się w:
Journal of Sustainable Mining
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Signs and symptoms of mercury-exposed gold miners
Autorzy:
Bose-O'Reilly, Stephan
Bernaudat, Ludovic
Siebert, Uwe
Roider, Gabriele
Nowak, Dennis
Drasch, Gustav
Powiązania:
https://bibliotekanauki.pl/articles/2161852.pdf
Data publikacji:
2017-03-30
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:
mercury
chronic mercury intoxication
clinical symptoms
neurological symptoms
artisanal small-scale gold mining
elemental mercury
Opis:
Objectives Gold miners use mercury to extract gold from ore adding liquid mercury to the milled gold-containing ore. This results in a mercury-gold compound, called amalgam. Miners smelt this amalgam to obtain gold, vaporizing it and finally inhaling the toxic mercury fumes. The objective was to merge and analyze data from different projects, to identify typical signs and symptoms of chronic inorganic mercury exposure. Material and Methods Miners and community members from various artisanal small-scale gold mining areas had been examined (Philippines, Mongolia, Tanzania, Zimbabwe, Indonesia). Data of several health assessments were pooled. Urine, blood and hair samples were analyzed for mercury (N = 1252). Questionnaires, standardized medical examinations and neuropsychological tests were used. Participants were grouped into: Controls (N = 209), living in an exposed area (N = 408), working with mercury as panners (N = 181), working with mercury as amalgam burners (N = 454). Chi2 test, linear trend test, Mann-Whitney test, Kruskal-Wallis test, correlation coefficient, Spearman’s rho, and analysis of variance tests were used. An algorithm was used to define participants with chronic mercury intoxication. Results Mean mercury concentrations in all exposed subgroups were elevated and above threshold limits, with amalgam burners showing highest levels. Typical symptoms of chronic metallic mercury intoxication were tremor, ataxia, coordination problems, excessive salivation and metallic taste. Participants from the exposed groups showed poorer results in different neuropsychological tests in comparison to the control group. Fifty-four percent of the high-exposed group (amalgam burners) were diagnosed as being mercury-intoxicated, compared to 0% within the control group (Chi2 p < 0.001). Conclusions Chronic mercury intoxication, with tremor, ataxia and other neurological symptoms together with a raised body burden of mercury was clinically diagnosed in exposed people in artisanal small-scale mining areas. The mercury exposure needs to be urgently reduced. Health care systems need to be prepared for this emerging problem of chronic mercury intoxication among exposed people. Int J Occup Med Environ Health 2017;30(2):249–269
Źródło:
International Journal of Occupational Medicine and Environmental Health; 2017, 30, 2; 249-269
1232-1087
1896-494X
Pojawia się w:
International Journal of Occupational Medicine and Environmental Health
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Gold mining stocks – an investor’s perspective
Akcje spółek wydobywających złoto – perspektywa inwestora
Autorzy:
Baranowski, Mikołaj
Pera, Krystian
Powiązania:
https://bibliotekanauki.pl/articles/27311668.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Instytut Gospodarki Surowcami Mineralnymi i Energią PAN
Tematy:
investment risk
gold mining
financial laverage
rate of return
Sharpe model
ryzyko inwestycyjne
wydobycie złota
stopa zwrotu
dźwignia finansowa
model Sharpe'a
Opis:
In this article, gold is analyzed from an investment perspective as an asset that allows you to increase your wealth. The analysis is twofold. First, it is about examining to what extent changes in gold prices in the world markets translate into changes in the prices of shares of companies that extract gold. Second, it was checked whether there is a financial leverage effect, which in this case means that changes in the price of shares of gold mining companies are greater than changes in the price of gold itself. Methodically, the Sharpe model was used and two basic parameters of the model were estimated, i.e. the intercept (alpha), and the beta coefficient as a measure of systematic risk, for the gold market and the equity market of gold mining companies and ETFs based on these companies. The research carried out in accordance with the logic of the Sharpe model shows that the obtained value of the alpha parameter for the stock market was positive, while for the gold market it was negative. At the same time, higher levels of this parameter are beneficial to the investor, which means that an advantage of the stock market over the gold market exists. In turn, the estimated beta for the stock market is much lower than for the gold market. The systematic risk level for stocks is 0.45, and for the gold market it is 1.98, which is a significant difference. The stocks of gold mining companies can be classified as defensive against the stock market (the rate of return of the gold mine stock is insensitive to market movements) and aggressive against the gold market (the rate of return of the gold mine shares reacts more strongly than the movement in the price of gold).
W niniejszym artykule złoto jest przedmiotem analizy z inwestycyjnej perspektywy, jako walor pozwalający pomnażać kapitał. Przy czym analiza jest dwojakiego rodzaju. Po pierwsze, chodzi o zbadanie, na ile zmiana cen złota na rynkach światowych przekłada się na zmiany cen akcji spółek, które złoto wydobywają. Po drugie, jeśli taki związek istnieje, to sprawdzono czy występuje efekt dźwigni finansowej, polegającej w tym przypadku na tym, że zmiany cen akcji spółek wydobywających złoto są większe od zmian cen samego złota. Metodycznie posłużono się ideą modelu Sharpe’a i oszacowano dwa podstawowe parametry modelu, czyli poziom wyrazu wolnego alfa, oraz współczynnik beta, jako miara ryzyka systematycznego każdorazowo dla rynku złota oraz rynku akcji spółek wydobywających złoto oraz funduszy ETF bazujących na tych spółkach. Z przeprowadzonych badań zgodnie z logiką modelu Sharpe’a wynika, że uzyskana wartość parametru alfa dla rynku akcji była dodatnia, natomiast dla rynku złota ujemna. Przy czym wyższe poziomy tego parametru są korzystne dla inwestora, co oznacza przewagę rynku akcji nad rynkiem złota. Z kolei oszacowany współczynnik beta dla rynku akcji jest zdecydowanie niższy niż dla rynku złota. Dla akcji poziom ryzyka systematycznego wynosi 0,45, a dla rynku złota 1,98, co jest różnicą istotną. Akcje spółek wydobywających złoto można zaklasyfikować jako defensywne względem rynku akcji (stopa zwrotu akcji kopalni złota jest mało wrażliwa na zmiany rynkowe) oraz agresywne względem rynku złota (stopa zwrotu akcji kopalni złota reaguje silniej niż zmiana ceny złota).
Źródło:
Gospodarka Surowcami Mineralnymi; 2023, 39, 2; 125--143
0860-0953
Pojawia się w:
Gospodarka Surowcami Mineralnymi
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chińskie inwestycje prywatne w Afryce: przypadek nielegalnego górnictwa złota w Ghanie
Chinese private investment in Africa: The case of illegal gold mining in Ghana
Autorzy:
Kopiński, Dominik
Sito, Agnieszka
Powiązania:
https://bibliotekanauki.pl/articles/567050.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie. Instytut Nauk Politycznych
Tematy:
chińsko-afrykańska współpraca
bezpośrednie inwestycje zagraniczne
górnictwo złota
degradacja środowiska naturalnego konflikty
Sino-African relations
foreign direct investment
gold mining
environmental degradation
conflicts
Opis:
Chinese private investment in Africa has become an increasingly important dimension of Sino-African relations, even though both media and academia have preferred to focus on other forms of Chinese engagement. A massive influx of Chinese to the gold mining sector in Ghana has been particularly noteworthy in this respect. Gold rush in Ghana, which is the second biggest producer of gold in Africa, has been unfolding since 2006 and serves as an example of how complex and far-reaching consequences Chinese private business involvement may carry. On a micro level, this would involve aspects of environmental degradation, security and social tensions. Illegal gold miners have also become a burden on thriving Ghana-China relations, especially after clashes with Chinese residents which ended with casualties, but also triggered a nation-wide debate about misconduct of foreigners. This situation presents a grave problem for the Ghanaian government, which seeks to both cater for local constituency and nurture bilateral relations with China. The article argues that illegal mining performed by the Chinese would not be possible without an active involvement of local people. It would not be also possible without an existing legal framework which appears obsolete, difficult to execute and at times becomes a source of adverse socio-economic effects. Nonetheless, artisanal gold mining in Ghana, properly regulated and opened to foreign small business, could in fact lead to broader participation of Ghanaian society in natural resources wealth.
Źródło:
Forum Politologiczne; 2014, 16 - Konteksty bezpieczeństwa w Afryce. Problemy globalne, sektorowe, regionalne, lokalne; 185-207
1734-1698
Pojawia się w:
Forum Politologiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Prospects for thiourea as a leaching agent in Colombian gold small-scale mining: a comprehensive review
Autorzy:
Borda, Johana
Torres, Robinson
Powiązania:
https://bibliotekanauki.pl/articles/2201416.pdf
Data publikacji:
2022
Wydawca:
Główny Instytut Górnictwa
Tematy:
górnictwo
złoto
cyjanek
tiomocznik
mining
gold
cyanide
thiourea
Opis:
Thiourea, as an alternative medium, is one of the most promising leaching agents for gold recovery by its commercial benefits and research challenges associated with performance and environmental impacts. This review article describes the operational conditions for the use of Thiourea vs cyanide, its chemistry, limitations, toxicity factors, environment, and recovery processes. Although thiourea gold extraction processes have not been applied on a large scale due to the instability of the reagent, its potential to overcome the limitations of cyanide is attractive to the process; with pH, potential, oxidant dosage, and temperature control, solubilized gold thiourea species are achieved. These can be recovered from the pregnant leach solution through methods such as activated carbon absorption and adsorption, polyurethane foams, ion exchange, and electrodeposition.
Źródło:
Journal of Sustainable Mining; 2022, 21, 4; 298--308
2300-1364
2300-3960
Pojawia się w:
Journal of Sustainable Mining
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Kopalnie złota na Wielisławce (Pogórze Kaczawskie)
Goldmines of the Wielisławka Hill (Kaczawa Upland)
Autorzy:
Maciejak, K.
Kowalski, A.
Maciejak, M.
Powiązania:
https://bibliotekanauki.pl/articles/122211.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa
Tematy:
historia górnictwa
złoto
srebro
Wielisławka
Sudety
mining history
gold
silver
Sudetes
Opis:
Autorzy przedstawiają opis górnictwa złota w rejonie masywu ryolitowego Wielisławki na Pogórzu Kaczawskim, na podstawie wyników kwerendy kartograficznej i bibliograficznej, analiz numerycznych modeli terenu LiDAR, a także prac terenowych. Niniejszy materiał wzbogacają m.in. dwie unikalne mapy, które należą do najcenniejszych dzieł kartografii górniczej na terenie Polski. Powstały one około 1556 r. jako materiał pomocniczy dla rozpatrzenia konfliktu, do jakiego doszło pomiędzy właścicielami ziemskimi a górnikami z kopalni złota na Wielisławce.
This paper presents the history of the gold mining activity within the Wielisławka Hill in the Kaczawskie Foothills. The results are based on a cartographic study of bibliographical research, LIDAR DTM analysis and field work. The article contains e.g. two unique maps from the collection of the State Archive in Prague which belong to the most relevant works of the cartography of mining in Poland. They have been drawn in or around 1556 as a supplementary material for the settlement of a dispute between land owners and miners from the Wielisławka gold mine. The article demonstrates that the gold mining in the Wielisławka massif had taken place on a much larger scale than hitherto expected. The mining operation has left relics in the form of sink hole fields, heaps, adits and underground galleries entering the massif of the hill by the Kaczawa river. The Wielisławka massif is nowadays a valuable destination for geotourism.
Źródło:
Hereditas Minariorum; 2017, 4; 45-63
2391-9450
2450-4114
Pojawia się w:
Hereditas Minariorum
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of the extractive gold process: open-pit mining through exergy analysis
Autorzy:
Velasquez, Hector I.
Orozco Loaiza, Carlos Andres
Hasenstab, Christian
Cano, Natalia A.
Powiązania:
https://bibliotekanauki.pl/articles/1839028.pdf
Data publikacji:
2020
Wydawca:
Główny Instytut Górnictwa
Tematy:
exergy
exergetic cost
extractive gold process
open-pit mining
silver
gold
egzergia
koszt egzergetyczny
wydobycie złota
wydobycie odkrywkowe
srebro
złoto
Opis:
The Colombian mining sector is characterized by the production of coal, nickel, emeralds, gold, and construction materials. It is considered by the National Development Plan of Colombia 2018-2022 as an economic agent that boosts development in the region and one that requires the strengthening of its policies and environmental liability. Therefore, this paper aims to show the importance of implementing methodologies based on the logic of nature (exergy) that objectively indicate the environmental impact of an extractive gold activity, such as open-pit gold mining. The extractive activity or process to be studied consists of the following stages: topsoil removal by using machinery and explosives to create craters and to access the mineral present in the subsoil; the physical transformation of the extracted material through crushing, grinding, gravimetric separation, flotation, leaching, adsorption, elution, and electrodeposition, along with smelting and casting to obtain gold and silver ingots. Thus, this paper analyzes the exergy performance of each unit process of the open-pit extractive process. The obtained results are used in a sensitivity analysis, which determines the system efficiency, by assuming the increase of gold in the extracted material in the exploitation stage, by using the same supplies and input of the current process. In other cases, the open-pit mining process is analyzed by changing its technologies in the mining process and assuming that this change reduces the inlet ore to 60%, by discarding 40% of material without gold and by reducing supply consumption by 25%. By improving the system efficiency, the exergy destroyed is reduced and the emissions to the environment diminish. Therefore, this method may be implemented as a basic guideline when it comes to decision-making processes in the planning of the extractive processes by integrating the environmental component with gold production.
Źródło:
Journal of Sustainable Mining; 2020, 19, 3; 166-181
2300-1364
2300-3960
Pojawia się w:
Journal of Sustainable Mining
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Socio-ecological analysis of artisanal gold mining in West Africa: a case study of Ghana
Autorzy:
Takyi, Richard
Hassan, Rasha
El Mahrad, Badr
Adade, Richard
Powiązania:
https://bibliotekanauki.pl/articles/2073904.pdf
Data publikacji:
2021
Wydawca:
Główny Instytut Górnictwa
Tematy:
artisanal mining
environmental assessment
management
gold
Ghana
górnictwo rzemieślnicze
ocena środowiskowa
zarządzanie
złoto
Opis:
The surge in artisanal gold mining (AGM) activities and the associated environmental impact in Ghana have elicited several stakeholders' attempts to curb the problem. However, due to little understanding of the underlying issues, these efforts have been ineffective. This study aims to use a socio-ecological framework to analyze drivers of AGM activities, the environmental pressures, the state change, their impact on human welfare, and the management response as measures (DAPSI(W)R(M)) to the problem. Evaluate AGM's impact on Ghana's ability to achieve the United Nations Sustainable Development Goals (SDGs). Data were collected from relevant literature on the subject and analyzed with the DAPSI(W) R(M) framework. Esteem needs, food, acceptance and friendship, and self-actualization are the main drivers of AGM activities leading to environmental pressures, including abrasion, extraction of living and non-living resources, the introduction of non-synthetic compounds, among others. State changes of the environment resulting from the pressures generated by human activities were changes in the land and forest cover (1.13%), topography (hills turned into flatland and undulating), and biota. Due to the state in the environment, water quality and availability, agriculture food production, fish yield, food safety, spiritual and cultural loss, death, injury, and health of gold miners and other stakeholders have been affected.
Źródło:
Journal of Sustainable Mining; 2021, 20, 3; 206--219
2300-1364
2300-3960
Pojawia się w:
Journal of Sustainable Mining
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Environmental, health and safety intricacies of artisanal mining in the gold-rich landscapes of Karamoja, north-eastern Uganda
Autorzy:
Serwajja, Eria
Mukwaya, Paul Isolo
Powiązania:
https://bibliotekanauki.pl/articles/1839058.pdf
Data publikacji:
2021
Wydawca:
Główny Instytut Górnictwa
Tematy:
artisanal mining
mercury
gold
health and safety
environment
Uganda
górnictwo rzemieślnicze
rtęć
złoto
BHP
środowisko
Opis:
Artisanal small-scale gold mining presents numerous opportunities for Uganda's rural poor. However, it also poses serious environmental, health and safety challenges. A suite of data collection methods including interviews, focus groups discussions, water and soils sampling were used to examine the perceptions of miners on the status, prevalence and extent of mercury use in artisanal gold mining, mercury transit routes and toxicity levels of soils and water in Karamoja sub-region. It also explores the health, safety and environmental implications of artisanal small-scale gold mining in the sub-region. The findings show that trade and access to mercury is widespread; although trade in, access to and its use is highly secretive. Traders access mercury through a number of ways including smuggling across the porous borderline and formal, but covert, importation. Miners then discreetly access it through undercover sales in jewellery shops and in affluent gated communities in Uganda's capital, Kampala. Soil and water samples showed mercury levels that exceeded the minimum acceptable limits of 0.03 mg/kg and 0.006 mg/l respectively. Further, artisanal small-scale gold mining is associated with massive land clearances and landscape deformations. It has invariably scarred the countryside with piles of waste and uncovered pits that are a source of accidents and ideal breeding grounds for vectors.
Źródło:
Journal of Sustainable Mining; 2021, 20, 2; 90-108
2300-1364
2300-3960
Pojawia się w:
Journal of Sustainable Mining
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Valorisation of Mining Waste for Gold Recovery
Odzysk złota z odpadów górniczych
Autorzy:
Ubaldini, S.
Guglietta, D.
Ubaldini, G.
Michelis, I. de
Powiązania:
https://bibliotekanauki.pl/articles/317939.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
odpady górnicze
proces hydrometalurgiczny
ługowanie tiosiarczanem
elektroliza
złoto
mining waste
hydrometallurgical processes
thiosulphate leaching
electrowinning
gold
Opis:
Purpose: the metals and industrial minerals contained in the tailings produced by mining and quarrying activities, are cause of environmental damage. The objective of this experimental work is the application of innovative technologies for the treatment and exploitation of mining tailings in Romania, in order to recover materials high grade raw to be placed on the market, reducing the volume of the wastes. Further objective, is to optimize some parameters relating to the dissolution of gold and the subsequent recovery from purified solutions, determining beforehand the technical feasibility of the scheme of process developed on a laboratory scale. Methods: the study is focused on hydrometallurgical process for the recovery of gold. The innovative treatment chosen is the thiosulphate process that, compared to conventional cyanide, has several advantages, first of all the most eco-friendly and non- toxic to humans. The conventional process shows operating limits in the case of auriferous minerals refractory materials, such as Romanian wastes object of the study. Another fundamental characteristic of the ammoniacal thiosulphate solutions, is the best selectivity towards gold, not attacking the majority of the gangue mineral constituents. Results: the dissolution rates of gold reached a final value of 70% Au – working at room temperature – with recoveries of the global process of about 65%, in line with the conventional process. Main conclusions: these results are very encouraging, considering that this is an innovative process, applied to a low content gold ore. The optimization of parameters and operating conditions, and the industrial treatment, continuous and scale greater would certainly permit to reach the best results in terms of process yields and energetic and reagents consumption.
Cel: metale i minerały zawarte w odpadach powstających w wyniku działalności górniczej i wydobywczej są przyczyną szkód w środowisku. Celem prac eksperymentalnych jest zastosowanie innowacyjnych technologii do obróbki i eksploatacji odpadów wydobywczych w Rumunii, w celu odzyskania wysokiej jakości surowców, które zostaną wprowadzone do obrotu, zmniejszając ilość deponowanych odpadów. Dalszym celem jest optymalizacja niektórych parametrów związanych z rozpuszczaniem złota i późniejsze odzyskiwanie z oczyszczonych roztworów, z określeniem technicznej wykonalności schematu procesu opracowanego w skali laboratoryjnej. Metoda: badanie koncentruje się na procesie hydrometalurgicznym odzyskiwania złota. Innowacyjnym sposobem jest zastosowanie do ługowania tiosiarczanu, który w porównaniu z tradycyjnym cyjankiem ma wiele zalet, przede wszystkim jest bardziej przyjazny dla środowiska i nietoksyczny dla ludzi. Konwencjonalny proces daje ograniczone wyniki dla badanych odpadów złotonośnych. Podstawową zaletą amoniakalnych roztworów tiosiarczanu jest lepsza selektywność w stosunku do złota, a nie ługowanie wszystkich składników mineralnych skały płonnej. Wyniki: wskaźniki rozpuszczania złota osiągnęły wartość 70% Au - w temperaturze pokojowej - w porównaniu do odzysku z procesu konwencjonalnego około 65%. Główne wnioski: wyniki są bardzo zachęcające, proces jest innowacyjny, zastosowany do rudy o niskiej zawartości złota. Optymalizacja parametrów i warunków pracy oraz wdrożenie w skali przemysłowej pozwoli osiągnąć lepsze wyniki pod względem wydajności procesu oraz zużycia energii i odczynników.
Źródło:
Inżynieria Mineralna; 2018, R. 20, nr 2, 2; 281-288
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 19

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