scholarly journals Effects of Small-Scale Gold Mining Tailings on the Underwater Light Field in the Tapajós River Basin, Brazilian Amazon

2017 ◽  
Vol 9 (8) ◽  
pp. 861 ◽  
Author(s):  
Felipe Lobo ◽  
Maycira Costa ◽  
Evlyn Novo ◽  
Kevin Telmer
Keyword(s):  
River Basin ◽  
Gold Mining ◽  
Light Field ◽  
Brazilian Amazon ◽  
Small Scale ◽  
Underwater Light Field ◽  
Mining Tailings ◽  
Underwater Light

scholarly journals The outbreak of illegal gold mining in the Brazilian Amazon boosts deforestation

2021 ◽  
Vol 21 (2) ◽  
Author(s):  
Juliana Siqueira-Gay ◽  
Luis E. Sánchez
Keyword(s):  
Gold Mining ◽  
Brazilian Amazon ◽  
Small Scale ◽  
Political Pressure ◽  
Deforestation Rate ◽  
Mining Areas ◽  
Mineral Supply ◽  
Regional Policies ◽  
Illegal Mining ◽  
Conservation Of Biodiversity

AbstractIncreased prices and political pressure are boosting illegal gold mining in the Brazilian Amazon, threatening forests, indigenous people, and conservation of biodiversity in protected areas. The rate of illegal mining deforestation increased more than 90% from 2017 to 2020, reaching 101.7 km2 annually in 2020 compared to 52.9 km2 annually in 2017. In that period, illegal mining deforestation rate grew more than the rate of clearing within mining leases. While formal mining is required to comply with environmental regulations, most small-scale or artisanal mining and especially illegal mining areas are abandoned after reserves are exhausted, without proper rehabilitation. Deforestation due to illegal mining is likely to increase in the next years, calling for coordination between local and regional policies as well as for strengthening and expanding international mechanisms to increase traceability of mineral supply chains with certification schemes to help to curb illegal mining.

scholarly journals Economic Impacts on Human Health Resulting from the Use of Mercury in the Illegal Gold Mining in the Brazilian Amazon: A Methodological Assessment

2021 ◽  
Vol 18 (22) ◽  
pp. 11869
Author(s):  
Leonardo Barcellos de Bakker ◽  
Pedro Gasparinetti ◽  
Júlia Mello de Queiroz ◽  
Ana Claudia Santiago de Vasconcellos
Keyword(s):  
Human Health ◽  
Gold Mining ◽  
Economic Value ◽  
Brazilian Amazon ◽  
Economic Losses ◽  
Small Scale ◽  
Environmental Damage ◽  
Statistical Life ◽  
Life Years ◽  
Methodological Assessment

Artisanal small-scale gold mining (ASGM) in the Amazon results in the dumping of tons of mercury into the environment annually. Despite consensus on the impacts of mercury on human health, there are still unknowns regarding: (i) the extent to which mercury from ASGM can be dispersed in the environment until it becomes toxic to humans; and (ii) the economic value of losses caused by contamination becomes evident. The main objective of this study is to propose a methodology to evaluate the impacts of ASGM on human health in different contexts in the Brazilian Amazon. We connect several points in the literature based on hypotheses regarding mercury dispersion in water, its transformation into methylmercury, and absorption by fish and humans. This methodology can be used as a tool to estimate the extent of environmental damage caused by artisanal gold mining, the severity of damage to the health of individuals contaminated by mercury and, consequently, can contribute to the application of fines to environmental violators. The consequences of contamination are evaluated by dose-response functions relating to mercury concentrations in hair and the development of the following health outcomes: (i) mild mental retardation, (ii) acute myocardial infarction, and (iii) hypertension. From disability-adjusted life years and statistical life value, we found that the economic losses range from 100,000 to 400,000 USD per kilogram of gold extracted. A case study of the Yanomami indigenous land shows that the impacts of mercury from illegal gold mining in 2020 totaled 69 million USD, which could be used by local authorities to compensate the Yanomami people.

scholarly journals Mercury Levels in Human Hair and Farmed Fish near Artisanal and Small-Scale Gold Mining Communities in the Madre de Dios River Basin, Peru

2017 ◽  
Author(s):  
Aubrey L. Langeland ◽  
Rebecca D. Hardin ◽  
Richard L. Neitzel
Keyword(s):  
River Basin ◽  
Gold Mining ◽  
Total Mercury ◽  
Mercury Level ◽  
Mercury Exposure ◽  
Small Scale ◽  
Farmed Fish ◽  
Mining Communities ◽  
Hair Mercury ◽  
Madre De Dios

Artisanal and small-scale gold mining (ASGM) has been an important source of income for communities in the Madre de Dios River Basin in Peru for hundreds of years. However, in recent decades, the scale of ASGM activities in the region has increased dramatically, and exposures to a variety of occupational and environmental hazards related to ASGM, including mercury, are becoming more widespread. The aims of our study were to: (1) examine patterns in the total hair mercury level of human participants in several communities in the region and compare these results to the 2.2 µg/g total hair mercury level equivalent to the World Health Organization (WHO) Expert Committee of Food Additives (JECFA)’s Provisional Tolerable Weekly Intake (PTWI); and (2), to measure the mercury levels of paco (Piaractus brachypomus) fish raised in local aquaculture ponds, in order to compare these levels to the EPA Fish Tissue Residue Criterion of 0.3 µg Hg/g fish (wet weight). We collected hair samples from 80 participants in four communities (one control and three where ASGM activities occurred) in the region, and collected 111 samples from fish raised in 24 local aquaculture farms. We then analyzed the samples for total mercury. Total mercury levels in hair were statistically significantly higher in the mining communities than in the control community, and increased with increasing distance away from the Madre de Dios headwaters (as the crow flies), did not differ by sex, and frequently exceeded the reference level. Regression analyses indicated that higher hair mercury levels were associated with residence in ASGM communities. The analysis of paco fish samples found no samples that exceeded the EPA tissue residue criterion. Collectively, these results align with other recent studies showing that ASGM activities are associated with elevated human mercury exposure. The fish farmed through the relatively new process of aquaculture in ASGM areas appeared to have little potential to contribute to human mercury exposure. More research is needed on human health risks associated with ASGM to discern occupational, residential, and nutritional exposure, especially through tracking temporal changes in mercury levels as fish ponds age, and assessing levels in different farmed fish species. Additionally, research is needed to definitively determine that elevated mercury levels in humans and fish result from the elemental mercury from mining, rather than from a different source, such as the mercury released from soil erosion during deforestation events from mining or other activities.

Small-scale Gold Mining in the Puyango River Basin,Southern Ecuador: A Study of Environmental Impacts andHuman Exposures

EcoHealth ◽  
2005 ◽  
Vol 2 (4) ◽  
pp. 323-332 ◽  
Author(s):  
Oscar Betancourt ◽  
Alberto Narváez ◽  
Marc Roulet
Keyword(s):  
Environmental Impacts ◽  
River Basin ◽  
Gold Mining ◽  
Small Scale ◽  
Southern Ecuador

Spectral Irradiance Distribution in Underwater Light Field Generated by an LED Light Source

2020 ◽  
Vol 103 (sp1) ◽  
pp. 453
Author(s):  
Ping Yang ◽  
Zizhao Wu ◽  
Yao Chen ◽  
Yilu Guo ◽  
Peng Zhang ◽  
...  
Keyword(s):  
Light Source ◽  
Light Field ◽  
Spectral Irradiance ◽  
Led Light ◽  
Underwater Light Field ◽  
Underwater Light
Sign in / Sign up

Export Citation Format

Share Document