Artisanal Mining Research Articles

Effectiveness of Different Sources of Biochar for Immobilizing Mercury in Soil from Artisanal and Small-Scale Gold Mining Areas in Taliwang Village of West Sumbawa Regency, Indonesia

Effectiveness of Different Sources of Biochar for Immobilizing Mercury in Soil from Artisanal and Small-Scale Gold Mining Areas in Taliwang Village of West Sumbawa Regency, Indonesia

Mercury speciation in environmental samples associated with artisanal small-scale gold mines using a novel solid-phase extraction approach to sample collection and preservation

In artisanal small-scale gold mines (ASGM), mercury (Hg) is known to pollute nearby river waters and sediments where it can be methylated to the highly bioavailable methylmercury (MeHg). The assessment of Hg speciation in water samples has been challenging for many years, with recommended procedures often not adequately allowing for analysis of samples in a suitable timeframe. Using a novel solid-phase extraction (SPE) method for sampling and preservation of Hg species, representative speciation data can be safely and easily collected and retained for up to 4-weeks (MeHg = 115 ± 8% refrigerated and 109 ± 13% unrefrigerated storage; Hg2+ = 100 ± 14% refrigerated and 94 ± 12% unrefrigerated storage). Concentrations of MeHg in environmental water samples and drinking water were below detection limit across two ASGM sites in western Kenya and concentrations of Hg2+ were below drinking water guidelines; however, drinking water sources contribute 20–30% of the tolerable weekly intake of Hg, indicating a need to minimise exposure of Hg from dietary sources to prevent Hg poisoning. Sediments from receiving rivers at ASGM sites showed total Hg concentrations above guideline limits (0.08–1.84 mg kg−1 total Hg) along the length of the river; however, MeHg concentrations fluctuated dependent on the stagnation of the river due to damns and ponds (5.9 ± 14.3 µg kg−1 MeHg). The findings show that SPE can be used as a robust sample collection and preservation approach for Hg speciation, which can better inform mitigation measures, understand ecological and human health implications, and improve environmental monitoring.

Governance fragmentation and agency of miners in Ghana’s artisanal mining sector

Artisanal mining in Ghana was established by law as a legitimate indigenous economic activity in 1989, but the sector still lacks a designated formalized governance architecture. Artisanal mining in Ghana borrows from a governance architecture that is designed for large-scale corporate mining. Aspects of artisanal mining fall under governance of various issue areas. Mechanisms that are exclusive to artisanal mining are mostly temporary, including such ad hoc measures as moratoria and paramilitary operations. Also, non-state actors adopt measures to address specific needs in the sector. Hence, Ghana’s artisanal mining governance architecture includes duplicate, overlapping, uncoordinated, and competitive formal and informal measures. This creates confusion and uncertainty, complicates and derails governance, and disrupts legal mining activity. Miners manage to navigate the environment, often through illegal operations. Sometimes, miners also craft independent governance architectures in the mining sites. Literature on governance of artisanal mining in Ghana addresses various empirical and theoretical questions, without highlighting the sector’s fragmented governance architectures and miners’ agency in that context. Redirecting attention to the trend, this paper examines the following questions: 1) In what ways does governance fragmentation manifest in Ghana’s artisanal mining sector? How do miners navigate the environment and how does miner agency impact the fragmented governance? The paper applies a global governance concept to shed new light on governance of artisanal mining, an informal domestic sector, in relation to miner agency in the fragmented governance environment in Ghana. Focusing on environmental issues, the paper uses data from field research in Ghana and relevant secondary sources. Although miners’ independent governance effort extends the governance fragmentation, it is an important guide on formalizing artisanal mining in the Ghanaian context. The paper makes novel empirical and theoretical contributions to discussions on governance fragmentation and governance of artisanal mining.

Negotiating the legitimacy of conservation at mining frontiers: Evidence from Madagascar and the DR Congo

Political ecologists are increasingly interested in the dynamics of power and authority where mining and conservation converge. We contribute to this emerging literature by applying an 'actor-oriented' approach to explore the creation of protected areas in African mining frontiers. Concretely, we look at how 'multiple-use' protected areas have been layered on top of mining frontiers in eastern DRC and northern Madagascar. Both of these mining frontiers include artisanal, semi-industrial, and industrial mining activities and permits. In the DRC case, various state and non-state armed actors are also implicated in mining. Our results show that the legitimacy of conservation at mining frontiers evolves as a process involving indiscrete phases of negotiation, coercion, resistance and cooperation. When authorities and alliances supporting mining interests preclude coercive conservation strategies, conservation authorities need to negotiate their way through different phases of resistance and cooperation. We find that in both cases, local actors living at the extraction and conservation nexus assert their agency and 'forum shop', by switching their allegiances between conservation and mining actors.

Utilising the 3D mineral system approach to identify the source of alluvial gold deposits in Ibala Town, Southwest Nigeria: an In-depth geological and geophysical exploration

ABSTRACT The Ibala gold field, discovered by artisanal miners in 2018, is located east of Ibala town in Osun State, southwest Nigeria. As older mines are depleted and abandoned, miners are now investigating the source of the deposits, believed to be auriferous quartz veins. This study uses the mineral system approach to trace the origin of the alluvial gold in the Ibala area. The research is conducted in three phases: first, a detailed analysis of the region’s structural patterns and rock distribution is undertaken to understand the area’s tectonic history. Next, a 3D conceptual model is created using an integrated geological and geophysical modeeling techinque to identify exploration targets and map the mineral system components. Finally, on-site verification is performed to validate the findings. The study reveals that the gold originates from auriferous shear zones characterized by high conductivity and chargeability geophysical signatures. These zones were formed by auriferous fluids released during the metamorphic devolatilization of deep volcanic rocks. As the fluids migrated through shear zones, they interacted with host rocks, precipitating gold alongside pyrite. When weathered, the gold-bearing material is transported via drainage channels, which miners now exploit. By using a mineral system approach, this research pinpoints the primary gold sources, supporting more efficient resource management and sustainable mining practices in the region.

Evaluating Socio-Economic and Environmental (SEE) Impact of Artisanal and Small-Scale Mining (ASM) of Gemstones on Livelihood in the Ijero-Ekiti Community, Nigeria

Artisanal and small-scale mining (ASM) has experienced explosive growth in recent years due to the rising value of mineral prices and the increasing difficulty of earning a living from agriculture and other rural activities, in that regard the Gem Mining Industry (GMI) has come to be one of the major sources of income and employment for the country, especially the local people of Ijero LGA in Ekiti State. Artisanal and Small-Scale mining effects in the state were studied using structured questionnaires. This research draws on primary data collected from households and artisanal miners. The questionnaire was designed to answer the following questions about the socio-economic impacts of small-scale tourmaline mining on local community livelihoods in Ijero-Ekiti, furthermore, the research employs of a descriptive survey design, to understand the effects of mining in the study area. Results indicate that overdependence on mining and poor diversification of livelihood options has hindered the development of rural communities. The equitable distribution of employment opportunities and revenue from small-scale mining remains a challenge for sustainable local development.

Examining Complexities of Artisanal and Small-Scale Gold Mining on Buru Island, Maluku Province, Indonesia

The Artisanal and Small-scale Gold Mining (ASGM) sector is presently one of the largest global sources of anthropogenic mercury emissions. The risk of mercury pollution from ASGM in Indonesia challenges other important industries including fisheries and tourism. Environmental degradation and risks to food safety and human health are major concerns that have been realised at local scales, including on Buru Island, Indonesia. Since the discovery of gold on Buru Island in 2011 the community has undergone dramatic changes. Some of these, such as rapid wealth accumulation, have been of benefit to people involved in the industry, however, they have been marred by negative social and economic consequences including rapid inflation, reduced rice production, and changes to the social fabric. We explore the Buru Island example through over 12 years of research interest and using empirical material through a socio-legal lens. Various legislative changes and government interventions have occurred since 2011 and there are complex interactions between industry players. Currently, the mining is low key with ore being transported to ‘back yard’ processing operations while a permitting system is anticipated. There is a legacy of land degradation and contamination as a result of the mining and ore processing. Alternatives to mercury are being considered but are challenged by uncertainty about product effectiveness, potential toxicity, and a lack of processing knowledge.

Mechanization of artisanal and small-scale gold mining in Guinea: Socio-technical trajectory of a rural mining site in Upper Guinea

Since the beginning of the 21st century, artisanal and small-scale gold mining (ASGM) in West Africa has undergone intensification and significant development due to the introduction of increasingly mechanized extraction and processing method. Mechanization generates significant transformations in the socio-technical dynamics of artisanal gold mining. In the specific context of ASGM in Upper Guinea, the article argues that small-scale innovations (ie. ‘low noise’ or ‘low technological level’ innovations) are leading to a profound socio-economic transformation of the rural environment over a long period of time. We begin by describing and analyzing the impact of the introduction of minor innovations (metal detectors, solonins and fan motors) on ASGM practices. We then examine the political, social and economic changes brought about by the adoption of these new mechanized practices, again at the rural level. Finally, we discuss the transition toward a new socio-technical regime, questioning the reshaping of local governance and its impact on new configurations of land ownership and use in rural areas.

Biomonitoring of Mercury and Lead Levels in the Blood of Children Living near a Tropical River Impacted by Artisanal and Small-Scale Gold Mining in Colombia.

(1) Background: Mercury and lead contamination resulting from various anthropogenic activities represents a global environmental problem and a considerable risk to the health of the human population. (2) Methods: The objective of this research was to evaluate the concentrations of mercury (Hg) and Lead (Pb) in the blood of the child population in the municipalities in the Atrato River basin using a direct Hg analyzer and graphite furnace atomic absorption spectrometry. (3) Results: In total, 171 children (5-14 years of age) were taken into account, and 18.71% (32) of the children had concentrations of Hg and Pb above the permissible values established by the WHO. In the municipality of UN, 19 children had blood Hg concentrations between 5.29 and 17.71 μg/L. In CA, two children had concentrations of 5.03 and 8.43 μg/L, separately. In the case of Pb, seven children showed concentrations between 3.60 and 4.83 μg/dL in the municipality of RQ, three in UN (3.59, 3.61, and 4.60 μg/dL), and one in Carmen de Atrato (5.47 μg/dL). (4) Conclusions: The levels of Hg and Pb in the blood of children living in the riparian areas of the Atrato River basin are related to gold mining activities in the basin and the consumption of contaminated fish.

Assessment of radiological contamination due to gold mining in soil and food crops of Babban Tsauni, Gwagwalada, Nigeria.

This work assessed the activity concentrations of 238U(226Ra), 232Th, and 40K and their associated radiological risks due to exposure to soil and consumption of food crops in Babban Tsauni artisanal gold mine, Gwagwalada, Nigeria, using the gamma spectrometry technique. The mean activity concentrations of 226Ra, 232Th, and 40K in the mine soil were 60.2±9.9, 161.4±16.2, and 664.6±138.2, while they were 46.4±4.9, 79.9±39.3, 266.4±185.4 for tubers and 46.9±15.7, 100.5±35.8, 311.4±132.7 (Bq/kg) for grains, respectively. The results reveal that the activity concentrations of radionuclides in all samples exceeded the recommended values set by United Nations Scientific Committee on the Effects of Atomic Radiation (33, 45, and 420 Bq/kg) except 40K, which fell within the acceptable limit in all food crop sample types. Estimated results for radiological hazard parameters, radium equivalent, annual effective dose due to ingestion, and excess life cancer risk were within safe limits, while the annual effective dose due to external gamma radiation in soil and annual gonadal equivalent dose were significantly high in all investigated samples; these call for constant radiological monitoring.

Participation in artisanal diamond mining and food security: A case study of Kasai Oriental in DR Congo

Abstract The high prevalence of food insecurity and malnutrition in Kasai Oriental, Democratic Republic of the Congo, prompted an investigation into the complex relationship between household livelihood activities and food security. Despite many rural households relying on subsistence farming, this alone may not ensure improved food security in Kasai Oriental. Consequently, non-farm sectors like artisanal mining offer a potential solution to address food insecurity among rural households. The aim of this study is to explore the association between engagement in artisanal diamond mining, food insecurity, and children’s nutritional status in Kasai Oriental. The research utilizes household cross-sectional data collected between November and December 2022. Fixed effects and Instrumental variable models were employed to address household heterogeneity and potential endogeneity related to participation in artisanal diamond activities. The regression results reveal a significant relationship between participation in artisanal diamond mining and food security. This implies that participation increases households’ cash, enabling them to access sufficient food and potentially mitigating the risk of falling into food insecurity. However, involvement in artisanal mining has not shown a significant association with children’s malnutrition. These findings call for further research on “hidden hunger.” Policies aiming to encourage and formalize artisanal diamond mining should integrate specific extension services and inform rural households about hidden hunger.

Elevated total mercury (THg) levels in water sources under the influence of artisanal and small-scale gold mining (ASGM) in Tanzania.

This study investigated the presence and distribution of mercury in water bodies under the influence of artisanal and small-scale mining (ASGM) activities in Tanzania, which continue to predominantly rely on mercury for gold extraction. Various water bodies available for domestic and animal use in mining communities were sampled from surface water sources in ASGM settlements during the rainy and dry seasons. Water samples were analysed using cold vapour atomic fluorescence spectrophotometer (CVAFS). The results indicate that most of water sources had THg levels above the WHO guideline of 1.0µg/L (1000ng/L) for safe drinking water. The levels were significantly higher during the wet season ranging from 3.4 to 96.3µg/L, whereas the range was from 0.84 to 2.12µg/L during the dry period. The higher THg values during the wet season are likely a result of increased lateral transport (e.g. via enhanced runoff) and physical properties of the waterways. Transportation and resuspension of matrix-bound mercury from surface soils and inflow of contaminated water from unprotected tailings were also observed to be potential means of lateral mercury transport. The lowest concentrations (0.846µg/L) were observed in water samples from the Mabubi River, upstream of a mining village. Downstream of the mining village in the same river, higher concentrations were observed in the Nungwe Bay region of Lake Victoria. In other surveyed mining settlements where there were no nearby rivers, pool water indicated high concentrations of THg, including levels above thresholds for safe human use. Immediate stringent measures are needed in order to ensure human and animal safety at ASGM mining settlements. Future investigation is suggested to focus on the distribution of mercury in different media, assessing the prevalence of different mercury species, and investigating the influence of weather and hydrological conditions on the impacts of mercury to organisms as part of the strategies to mitigate mercury pollution.

Ecohydrological risk assessment model for the Pra River Basin using GIS and multi-criteria decision making

ABSTRACT The Pra River Basin in Ghana is a major source of ecological, cultural, and economic benefits. However, it has been experiencing degradation, and logistical constraints have limited the implementation of Integrated Water Resources Management. This study presents a GIS-based ecohydrological risk model that identifies ecohydrological units with the highest degradation risk. First, the PRB was divided into 25 eco-hydrological units. Second, seven drivers of degradation were identified and mapped. The drivers were reclassified into five categories with risk scores of 1–5, with 5 indicating higher risk scores. The variables were ranked using the Analytical Hierarchy Process, the degradation risk model was calculated using the weighted sum method, and the multi-criteria decision tool was used to identify the ecohydrological units with the highest degradation risk. Of the 25 ecohydrological units delineated, the Buama, Lower Offin, Ayensu, and Oda ecohydrological units were found to be at the highest risk of degradation due to high artisanal small-scale gold mining, high population density, low forest/vegetation cover, and high encroachment in waterways. The results can be used as a guide to prioritize management intervention, starting with the areas classified as high risk and moving down to those classified as moderate risk.

Evaluating Policy and Legal Challenges in the Legalisation of Artisanal Small Scale Gold Mining in West Kalimantan

Evaluating Policy and Legal Challenges in the Legalisation of Artisanal Small Scale Gold Mining in West Kalimantan

Technology, capital, and sustainability: Frontiers in just transitions for African mining

Transitions towards sustainability are crucial in the natural resource sector in Africa, particularly in artisanal and small-scale gold mining (ASGM). This sector is notably characterized by the extensive use of mercury for gold extraction, which poses significant risks to both human health and ecosystems. This study focuses on Tanzania, where international incentives to reduce mercury have led the state to promote alternative methods and scale up production primarily through cyanide leaching—a more mechanized gold extraction technique.This article examines the implementation of these strategies, identifies the barriers hindering this transition, and explores the resulting inequalities. We employ a mixed methods approach, combining surveys, semi-structured interviews, and participant observation. We adopt the Sustainability and Just Transitions frameworks for the Global South, arguing that applying an in-depth relational approach to the interactions between actors and technologies can illuminate the persistence of environmentally unsustainable practices within the local context. In conclusion, we advocate for international strategies aimed at the Global South to consider the how promoting the eradication of environmentally unsustainable practices can affect livelihood creation mechanisms.

‘New mining scheme, same old problems?’; risk factors and health challenges in underground community mining in Ghana

Abstract Ghana’s small-scale mining sector has long been a cornerstone of its economy and a vital source of livelihood for many communities. However, the sector is plagued by significant challenges, including environmental degradation, health and safety risks, and illegal practices. In response, the Ghanaian government introduced the Community Mining Scheme (CMS), a new mining model designed to promote local community participation in artisanal small-scale gold mining (ASGM). This study examines the workplace risk factors and associated health challenges faced by ASGM miners under the CMS, drawing on interviews with fifty underground CMS miners in Ghana. Our findings reveal that miners continue to face numerous health and safety challenges, including inadequate lighting, poor ventilation, exposure to noise and odors, unsupported or poorly supported loose materials, non-use of personal protective equipment, high dust levels, and unsafe blasting practices. Additionally, health concerns such as skin rashes, musculoskeletal injuries, and the risk of mercury poisoning persist. These challenges mirror those reported in the literature on unregulated and illegal ASGM in Ghana, indicating that existing issues remain unresolved under the CMS. To prevent the undermining of this initiative, it is crucial to adopt progressive practices, such as localized coping strategies and the recruitment of trained professionals to lead ASGM operations within the CMS. Enhancing miners’ risk perception through targeted outreach and awareness campaigns is also essential. Further recommendations for mitigating safety risks and health challenges are discussed in the article.

Informal, Legal, or Illegal? Varieties of Artisanal Mining in the Global South

abstract: Artisanal mining in the Global South increased during the 2002–14 commodity boom, yet variation in the informal status of miners remains understudied. The authors define the status of artisanal mining based on the degree of rule compliance and the willingness of state actors to enforce such compliance: it is legal when the miners have formal permits to operate and follow state rules to mine, but it is illegal when the mining takes places in restricted natural reserves and noncompliance with state mining rules is extensive. The article explains transitions in the informal status of artisanal miners by examining the importance of mining to the local economy and the organizational asymmetries within the sector—that is, the differences in the associative strength of artisanal mining within a region. Where artisanal mining is central to the local economy, low asymmetries help miners transition to legality while high asymmetries, by contrast, push them toward illegality and criminality. The authors process trace these transitions in Peru’s most important gold-producing regions. The findings have broad implications for other small-scale producers and merchants whose activities are also known for widespread informality.

The effect of cow manure amendment and the ratio of gold mine tailings on sweet potato gold phytomining

Artisanal and small-scale gold mining has commonly used the mercury amalgamation method for gold ore extraction. The processing waste or tailings often contain gold and other metals. This study examined the effects of cow manure amendment and the ratio of gold mine tailings on sweet potato (Ipomoea batatas L.) gold phytomining. The pot experiment was conducted in the Faculty of Agriculture greenhouse at Padjadjaran University in Indonesia. The sweet potato MZ119 clone (an orange-fleshed sweet potato) was planted on a polybag (40 x 40 cm) consisting of 10 kg of planting media, which was a mixture of gold mine tailing and soil. The design used was a completely randomized design factorial with three replications. The first factor was ratios of gold mine tailing consisting of three levels, namely 30%, 50%, 70%, and 100% (w/w). The second factor was doses of organic manure, namely without cow manure, 250 g pot-1, 500 g pot-1, and 750 g pot-1. The results demonstrated that the application of cow dung and the gold mine tailings ratio (w/w) had a significant (p = 0.05) effect on plants' dry weight biomass, gold accumulation, and gold phytomining by sweet potato. The highest gold mass yield of 0.066 mg gold plant-1 was achieved by a 50% (w/w) gold mine tailing ratio and 750 g pot-1 cow manure treatment.

Extent and drivers of land productivity degradation at the territorial level in Eastern DR Congo

Land degradation is a global environmental problem that affects the livelihoods of communities. Understanding the extent and causative factors of this phenomenon is important to design the cause-targeted strategies to cope with this problem. This study aimed to assess the effects of biophysical and socio-economic factors on the occurrence of land productivity degradation at the territorial level in Eastern DR Congo, using the Kalehe territory as a case study. The land productivity dynamics were determined based on the trend analysis of Landsat-based NDVI annual composites over the 1987-2020 period. Additionally, a binary logistic regression model was developed to identify the determinant factors and to map the susceptibility of this degradation at the territorial level. The results revealed that 31.25% (1303.175 km2) of the territory had experienced a decrease in land productivity, with 10.8% (453.83 km2) characterized by a significant decrease at the confidence level of 90%, representing the hotspots area of land productivity degradation where conservation actions should be prioritized. This decrease in land productivity is location-specific as it depends on the land cover types and health zones. It is likely to occur at high altitudes, in areas close to artisanal mining sites, rivers, and administrative centers. These results imply that policy interventions to cope with the problem of land productivity degradation should be developed following the heterogeneity of the landscape, and sustainable land management practices that take into account both the biophysical and socio-economic drivers of land degradation should be implemented in this region to achieve the land degradation neutrality by 2030.

Assessment of the impact of gold panning on bacteriological parameters, heavy metals and cyanide in the waters of the Niger river in Guinea

Artisanal mining, or traditional gold panning, plays a key role in Guinea's socio-economic activities. Today, this ancestral activity has undergone changes with the introduction of new extraction techniques that affect the population's living environment. The aim of this study is to assess the impact of artisanal mining on bacteriological parameters, heavy metals and cyanide in the waters of the Niger River in Guinea. To carry out this work, we chose five (05) sites (sampling points), taking into account the intensity of the mining activity taking place around them and on the Niger. We took fifteen samples to determine bacteriological parameters (fecal coliforms, total coliforms and Escherichia coli), free cyanide and certain heavy metals at the regional water quality laboratory. This study enabled us to determine the impact of gold panning on bacteriological parameters, cyanide and certain heavy metals in the waters of the Niger River in Guinea, and to identify possible solutions. Conclusion and outlook: Analysis of the results shows that, overall, the water sampled is of good quality. However, some parameters at certain measurement sites showed signs of pollution.