Lasar Segall, pintor brasileiro

Filho, Fernando Antonio Pinheiro

doi:10.4000/books.oep.567

Cited by 2 publications

(6 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To cover the variety of mining activities in the Amazon, 13 main regions for ore exploitation were considered for analysis, including both small-scale and large-scale that present specific characteristics in terms of socio-economic and territorial aspects ( Figure 1). The areas were selected based on literature review [10] and other databases [1,13]. Although other areas in the Brazilian Amazon present relevant mining activities, such as the state of Roraima and north of the Amazon State (diamond and gold mining), they were not included either due to the lack of cloud-free images or to the mining process, mainly in rivers in rafts and dredges, which are hardly detectable by satellite imagery [2,18].…”

Section: Mining Sites In the Brazilian Amazonmentioning

confidence: 99%

“…All the images were selected with data range from July to September 2017, with exception of Taboca (AM) and Serra do Navio (AP), due to a lack of a more recent cloud-free images. Based on a literature review [1,13,18], Table 1 provides more general information about each study area including type of ore exploited, Federal Units-State, and whether it is a large-scale (industrial) or small-scale mining (locally called "garimpos"). Table 1.…”

Section: Mining Sites In the Brazilian Amazonmentioning

confidence: 99%

“…According to Table 4, some minerals such as iron, manganese, copper, and nickel are exploited by industrial mining only, even though it comprises approximately a third of the total mining area mapped in this research. Industrial mining in the Brazilian Amazon is responsible for approximately 14% of total national annual exportation [1]. For some minerals such as bauxite, copper, kaolin, manganese and tin, Amazonian production totals 90% of national production.…”

Section: Total Area Type Of Mineral and Scalementioning

confidence: 99%

“…For some minerals such as bauxite, copper, kaolin, manganese and tin, Amazonian production totals 90% of national production. To illustrate its economic importance, the Financial Compensation for Mining Exploitation [1] indicates that incomes from Amazonian mining exportation yielded, approximately, US$ 531 million in 2016, of which 96% are related to the state of Pará, mostly from iron, bauxite and copper exploitation, which corresponds to 90% of total exportation in Pará.…”

Section: Total Area Type Of Mineral and Scalementioning

confidence: 99%

“…Brazil is one of the leading countries in mineral production, 40% of which comes from the Amazonian states [1] generating large financial compensation for local municipalities and states. At the same time, these activities have profound impacts on the Amazon regional economy, and cause intense social conflicts [2] and environmental impacts, such as water contamination [3].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Mapping Mining Areas in the Brazilian Amazon Using MSI/Sentinel-2 Imagery (2017)

et al. 2018

View full text Add to dashboard Cite

Although mining plays an important role for the economy of the Amazon, little is known about its attributes such as area, type, scale, and current status as well as socio/environmental impacts. Therefore, we first propose a low time-consuming and high detection accuracy method for mapping the current mining areas within 13 regions of the Brazilian Amazon using Sentinel-2 images. Then, integrating the maps in a GIS (Geography Information System) environment, mining attributes for each region were further assessed with the aid of the DNPM (National Department for Mineral Production) database. Detection of the mining area was conducted in five main steps. (a) MSI (MultiSpectral Instrument)/Sentinel-2A (S2A) image selection; (b) definition of land-use classes and training samples; (c) supervised classification; (d) vector editing for quality control; and (e) validation with high-resolution RapidEye images (Kappa = 0.70). Mining areas derived from validated S2A classification totals 1084.7 km2 in the regions analyzed. Small-scale mining comprises up to 64% of total mining area detected comprises mostly gold (617.8 km2), followed by tin mining (73.0 km2). The remaining 36% is comprised by industrial mining such as iron (47.8), copper (55.5) and manganese (8.9 km2) in Carajás, bauxite in Trombetas (78.4) and Rio Capim (48.5 km2). Given recent events of mining impacts, the large extension of mining areas detected raises a concern regarding its socio-environmental impacts for the Amazonian ecosystems and for local communities.

show abstract

Section: Mining Sites In the Brazilian Amazonmentioning

confidence: 99%

Section: Mining Sites In the Brazilian Amazonmentioning

confidence: 99%

Section: Total Area Type Of Mineral and Scalementioning

confidence: 99%

Section: Total Area Type Of Mineral and Scalementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Mapping Mining Areas in the Brazilian Amazon Using MSI/Sentinel-2 Imagery (2017)

et al. 2018

View full text Add to dashboard Cite

show abstract

The Mineralogy, Geochemistry and Origin of the Supergene Manganese Occurrences in the Southern Minas Gerais, Brazil

Parrotti,

da Conceição,

Navarro

2023

Minerals

View full text Add to dashboard Cite

In equatorial and tropical regions, supergene mineral deposits created during water/rock interactions are found. Simply put, these supergene deposits are formed through the accumulation of low solubility ions or through the preservation of primary minerals. The supergene manganese (Mn) deposits are examples of the economic importance associated with the chemical weathering processes. In Brazil, the Southern Brasilia Orogen (SBO) was generated during the collision between the Paranapanema Craton and the passive margin of the São Francisco Craton. In the southern Minas Gerais (MG), several supergene Mn occurrences are hosted in the SBO, which were originated during the chemical weathering of gondites belonging to the Amparo Complex. Here, we studied the supergene Mn occurrences in the southern MG, more specifically in the municipalities of Ouro Fino and Careaçu. The MnO contents ranged from 25.50 to 28.40 wt% at Ouro Fino and from 16.80 to 21.20 wt% at Careaçu. These supergene Mn deposits have a diverse mineral assemblage, being composed of spessartine, quartz, Mn-oxides, goethite and kaolinite. The various Mn minerals formed due to spessartine incongruent dissolution were hollandites, cryptomelanes, romanechites, pyrolusites and lithiophorites. Both study areas are relevant for the possible opening of mines for the commercialization of Mn.

show abstract

Lasar Segall, pintor brasileiro

Cited by 2 publications

References 0 publications

Mapping Mining Areas in the Brazilian Amazon Using MSI/Sentinel-2 Imagery (2017)

Mapping Mining Areas in the Brazilian Amazon Using MSI/Sentinel-2 Imagery (2017)

The Mineralogy, Geochemistry and Origin of the Supergene Manganese Occurrences in the Southern Minas Gerais, Brazil

Contact Info

Product

Resources

About