Does Exposure to Naturally Occurring Asbestos (NOA) During Dam Construction Increase Mesothelioma Risk?

2020 ◽  
Vol 26 (1) ◽  
pp. 29-33
Author(s):  
Daniel W. Hernandez
Keyword(s):  
Construction Project ◽  
Current Understanding ◽  
Dam Construction ◽  
Mining Operations ◽  
Protective Measures ◽  
Mineral Fibers ◽  
Mineral Particles ◽  
Naturally Occurring ◽  
Naturally Occurring Asbestos ◽  
Compare And Contrast

ABSTRACT The Calaveras Dam Replacement Project, a major construction project completed in 2019, involved hundreds of workers using heavy earth-moving equipment and mining operations, including blasting, drilling, rock crushing, and other operations designed to move millions of cubic yards of earth. Much of the material was composed of serpentinite, blueschist, and other rocks that contain chrysotile and a variety of amphibole minerals, including glaucophane, winchite, actinolite, tremolite, and other asbestos-related amphiboles. This article explores the unique characteristics of the blueschist that required extensive protective measures to be undertaken by the contractor to protect workers and surrounding sensitive receptors. This article will provide an overall summary of the dimensional characteristics of the airborne blueschist elongate mineral particles encountered during construction activities to compare and contrast current understanding of cleavage fragments versus asbestiform mineral fibers.

scholarly journals Impact of Naturally Occurring Asbestos on Asbestos Ban: Regulations and Experience of the Republic of Korea

2022 ◽  
Vol 19 (2) ◽  
pp. 742
Author(s):  
Jiwoon Kwon
Keyword(s):  
Preventive Measures ◽  
Control Measures ◽  
Exposure Risk ◽  
Close Collaboration ◽  
Mineral Particles ◽  
Naturally Occurring ◽  
Transmission Electron ◽  
The Future ◽  
Naturally Occurring Asbestos ◽  
The Republic

This review examined the main issues debated in Korea regarding the production and use of materials containing naturally occurring asbestos (NOA) as impurities, and investigated the impacts of these debates on the asbestos ban, as well as the future implications. In Korea, incidents associated with the production and use of NOA-contaminated talc powders, construction rocks, serpentinites, and dolomite rocks raised public concern and led to accelerating the ban on asbestos. The main controversies concern policies on appropriate asbestos content limits, whether materials containing a trace amount of NOA should be banned, and the control of materials with high human exposure risk. To address recurring controversies, the implementation of preventive measures to manage elongated mineral particles and the use of transmission electron microscopy for more sensitive analysis need to be discussed, along with reaching social agreement on the controversial policies. To minimize the potential exposure to asbestos that may occur during the production and use of industrial minerals in the future, it is necessary to apply occupational exposure control measures and monitor the health effects of the relevant population groups. These national policies on NOA should be prepared based on close collaboration and discussion with policymakers, industry stakeholders, and related academic experts.

Naturally Occurring Asbestos in France: A Technical and Regulatory Review

2020 ◽  
Vol 26 (1) ◽  
pp. 61-65 ◽  
Author(s):  
Erell Léocat
Keyword(s):  
Health And Safety ◽  
Morphological Identification ◽  
Fiber Morphology ◽  
National Agency ◽  
Regulatory Review ◽  
Air Filter ◽  
Road Base ◽  
Mineral Particles ◽  
Naturally Occurring ◽  
Naturally Occurring Asbestos

ABSTRACT Naturally occurring asbestos (NOA) has been a well-known issue within rock quarries for a long time. In France, the subject has recently become more controversial, particularly since 2013. In fact, some mineral fibers with the chemical composition of regulated asbestos (i.e., actinolite) have been discovered in road-base aggregates and associated air filter samples. The main problem concerns the determination of the asbestiform versus non-asbestiform character of such mineral particles. The in-force standard based on the morphological identification of a fiber does not allow one to make this distinction. Presently, in France, the asbestos analysis of building material is based on a “yes” or “no” result. This method has limitations for analyzing NOA, as NOA may be present in lower concentrations in natural materials, especially in road-base aggregates. The health effects of the non-asbestiform particles, also called “cleavage fragments,” with fiber morphology are not well established. The French government mandated the National Agency for Food, Environmental and Occupational Health and Safety to conduct a review on the “state of the art” concerning the cleavage fragment issue. The conclusions of the report highlight the fact that elongate mineral particles (EMPs) are up for debate and address remaining questions concerning this subject. The next fundamental step is to secure agreement on the terminology of EMPs with the aim of comparing the studies in different disciplines.

Impacts of land use on spatial distribution of mortality rates of cancers caused by naturally occurring asbestos

2012 ◽  
Vol 22 (5) ◽  
pp. 516-521 ◽  
Author(s):  
Binggan Wei ◽  
Xianjie Jia ◽  
Bixiong Ye ◽  
Jiangping Yu ◽  
Biao Zhang ◽  
...  
Keyword(s):  
Land Use ◽  
Spatial Distribution ◽  
Mortality Rates ◽  
Naturally Occurring ◽  
Naturally Occurring Asbestos

Overview of Naturally Occurring Asbestos in California and Southwestern Nevada

2020 ◽  
Vol 26 (1) ◽  
pp. 9-14
Author(s):  
R. Mark Bailey
Keyword(s):  
Sierra Nevada ◽  
North American ◽  
Volcanic Belt ◽  
Island Arc ◽  
North American Plate ◽  
Mountain Range ◽  
The North ◽  
Rock Types ◽  
Naturally Occurring ◽  
Naturally Occurring Asbestos

ABSTRACT Naturally occurring asbestos (NOA) is being discovered in a widening array of geologic environments. The complex geology of the state of California is an excellent example of the variety of geologic environments and rock types that contain NOA. Notably, the majority of California rocks were emplaced during a continental collision of eastward-subducting oceanic and island arc terranes (Pacific and Farallon plates) with the westward continental margin of the North American plate between 65 and 150 MY BP. This collision and accompanying accretion of oceanic and island arc material from the Pacific plate onto the North American plate, as well as the thermal events caused by emplacement of the large volcanic belt that became today's Sierra Nevada mountain range, are the principal processes that produced the rocks where the majority of NOA-bearing units have been identified.

Quantifying Discrete Seismic Responses to Mining

2020 ◽  
Author(s):  
Laura G Brown
Keyword(s):  
Sensor Array ◽  
Underground Mining ◽  
Complex Nature ◽  
Seismic Responses ◽  
Mining Operations ◽  
Analysis Techniques ◽  
Naturally Occurring ◽  
Single Link ◽  
Rock Mass Failure ◽  
Temporal Windows

Applying analysis techniques developed for naturally occurring earthquakes to mine seismicity is common practice, however, these methodologies rarely consider the influence of blasting on the dynamic rock mass failure processes observed in mines. Due to the complex nature of bulk orebody extraction at depth, quantifying discrete seismic responses to mining can be challenging. This paper identifies seismic responses to mining by pairing single-link clustering with finite temporal windows bound by mine blasting practices. A methodology is presented to quantify the space-time characteristics of these responses using four Seismic Response Parameters (SRP’s): Distance to Blast, Distance to Centroid, Time After Blast and Time Between Events. Using SRP’s, seismic responses to mining can be quantitatively classified as induced, complex or triggered (with respect to discrete mine blasting). Because these response parameters do not require an extensive and/or triaxial dense sensor array, they are applicable to a variety of underground mining operations. In this work, SRP’s are applied to 189 discrete seismic responses occurring over two months of active mining, and a two week shutdown period, at Agnico Eagle’s LaRonde Mine.

Naturally occurring asbestos in an alpine ophiolitic complex (northern Corsica, France)

2019 ◽  
Vol 78 (17) ◽  
Author(s):  
Didier Lahondère ◽  
Florence Cagnard ◽  
Guillaume Wille ◽  
Jéromine Duron
Keyword(s):  
Naturally Occurring ◽  
Naturally Occurring Asbestos ◽  
Ophiolitic Complex
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