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Author (up) Cardu, M.; Godio, A.; Oggeri, C.; Seccatore, J.
Title The influence of rock mass fracturing on splitting and contour blasts Type
Year 2022 Publication Geomechanics and Geoengineering-An International Journal Abbreviated Journal Geomech. Geoengin.
Volume 17 Issue 3 Pages 822-833
Keywords Drill & blast; contour blasting; rock quality designation; half cast factor; over break
Abstract Splitting and contour blasting are aimed to achieve suitable profiles by cutting along a surface, while common blasting is intended to detach and to fragment relevant rock volumes by increasing the fracturing state. These techniques are adopted in both underground works (tunnels, caverns, quarries) and also for surface excavations (quarries, mines, rock slopes engineering). Contour blasts are widely used techniques in mining and civil engineering to enhance performance while maintaining the safety of personnel and infrastructure. Splitting blasts are mainly used in dimension stone mining to obtain intact blocks of valuable ornamental stone. The parameters of controlled blasting (geometry, charge, blast agent) require an accurate selection using optimised blasting patterns and explosive properties; most of the proposed methods are limited and unsatisfactory due to insufficient consideration of rock mass properties. A quick but effective comparison and analysis of the different characteristics of the rock mass and its heterogeneities is presented, as it indicates a better strategy to determine a tailored blasting design for a given site, thus significantly improving the contour blasting quality.
Address
Corporate Author Thesis
Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 1748-6025 ISBN Medium
Area Expedition Conference
Notes WOS:000630315000001 Approved
Call Number UAI @ alexi.delcanto @ Serial 1361
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Author (up) Cardu, M.; Seccatore, J.
Title Quantifying the difficulty of tunnelling by drilling and blasting Type
Year 2016 Publication Tunnelling And Underground Space Technology Abbreviated Journal Tunn. Undergr. Space Technol.
Volume 60 Issue Pages 178-182
Keywords Pull efficiency; Rock type; Blasting pattern; Specific consumptions
Abstract This study deals with industrial trends in tunnelling by drill and blast (D&B). We perform a statistical analysis of accumulated experience from the 1950s to the modern day to provide advice for proper project management in tunnel driving. The basis of the study is a wide database of tunnel blast schemes. This database is made of excavation parameters, and considers two main families of blasts: with parallel hole cuts and with inclined hole cuts. Such parameters are analysed by means of statistical regression. Correlations are shown. We present a general curve of correlation between tunnel sections and specific drilling and specific explosive consumption. We show how pull efficiency cannot be correlated to a single parameter, and how tunnelling by D&B needs to be treated as a complex system. Finally, we propose a method for quantifying and classifying the difficulty of tunnelling. The deviation of specific drilling (SD) from industrial average trend is used as an indicator of difficulty: easier when SD is lower than average, and more difficult when SD is higher than average. We show how such deviation can be preliminarily associated with lithotypes. This provides to designers and cost estimators a tool of a first approximation for D&B cost prediction at the pre-feasability and feasibility stages of a tunnelling project. (C) 2016 Elsevier Ltd. All rights reserved.
Address [Cardu, Marilena] Politecn Torino DIATI, Turin, Italy, Email: marilena.cardu@polito.it
Corporate Author Thesis
Publisher Pergamon-Elsevier Science Ltd Place of Publication Editor
Language English Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0886-7798 ISBN Medium
Area Expedition Conference
Notes WOS:000387834900017 Approved
Call Number UAI @ eduardo.moreno @ Serial 677
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Author (up) Cheng, Y.C.; Nakajima, K.; Nansai, K.; Seccatore, J.; Veiga, M.M.; Takaoka, M.
Title Examining the inconsistency of mercury flow in post-Minamata Convention global trade concerning artisanal and small-scale gold mining activity Type
Year 2022 Publication Resources Conservation and Recycling Abbreviated Journal Resour. Conserv. Recycl.
Volume 185 Issue Pages 106461
Keywords Mercury; Minamata convention; Global trade; Artisanal and small-scale gold mining (ASGM)
Abstract In 2017, the Minamata Convention (MC) on mercury (Hg) control entered into force. However, whether the MC is effective and how it reshapes the global Hg flow remain unclear. In this study, we established a method to detect inconsistencies in data on global Hg trade, and calculated the gap between the demand and supply of Hg to the artisanal and small-scale gold mining (ASGM) sector (i.e., the largest source of Hg emissions globally) in 39 countries across four regions. According to our results, inconsistencies in statistical data concerning Hg for ASGM activities exist in both Africa and Central and South America. Asia showed a considerably lower amount of Hg applied to ASGM than apparent Hg consumption; nevertheless, the largest consumer of Hg was Asia, predomi-nantly China and India. Many countries in which ASGM is conducted are already MC parties; however, only few submitted their national action plans (NAPs) or have established/enforced specific laws to curb Hg use in ASGM. Analysis of Hg-related trade information suggests that in 2017, the trade of metallic Hg disappeared in some African and Central and South American countries, but new trade flows of goods with higher Hg content emerged. The method established in this study can support the search for countries implementing ASGM with hidden Hg use and flows, thereby contributing to the planning of further Hg control regulations. To enforce sound Hg management, the submission of NAPs should also be promoted in addition to the expansion of MC parties.
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Corporate Author Thesis
Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0921-3449 ISBN Medium
Area Expedition Conference
Notes WOS:000830275400006 Approved
Call Number UAI @ alexi.delcanto @ Serial 1621
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Author (up) Cheng, Y.C.; Watari, T.; Seccatore, J.; Nakajima, K.; Nansai, K.; Takaoka, M.
Title A review of gold production, mercury consumption, and emission in artisanal and small-scale gold mining (ASGM) Type
Year 2023 Publication Resources Policy Abbreviated Journal Resour. Policy
Volume 81 Issue Pages 103370
Keywords Illegal artisanal and small-scale gold mining (ASGM); Gold production; Mercury use; Mercury emission; Minamata convention (MC)
Abstract Artisanal and small-scale gold mining (ASGM) is one of the largest sources of Hg emissions and is critical for addressing the Hg problem. Due to scarce and punctual statistics provided by governments and agencies, there is almost no accurate data on ASGM production, Hg use, and emissions. In this study, we surveyed different ap-proaches to estimate ASGM production and collected data from different sources, including academic papers and technical reports. Globally, 380-870 tonnes of gold is produced by ASGM each year, with a median value of 520 tonnes. The Hg use in the ASGM sector was estimated to be 640-1000 tonnes each year, with a median value of 892 tonnes. Consequently, 248-838 tonnes of Hg are emitted from the ASGM sector each year, with a median value of 615 tonnes. However, significant discrepancies were found in the data calculated using different ap-proaches, particularly in countries where the estimates were large, such as China. To obtain a more accurate picture of global ASGM activities, a general estimation approach combining specific studies of dominant coun-tries is necessary. For better management of ASGM in the future, developing a solid baseline and comprehensive future projection scenarios and establishing international collaboration to construct guidance on ASGM are recommended.
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Corporate Author Thesis
Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0301-4207 ISBN Medium
Area Expedition Conference
Notes WOS:000964612900001 Approved
Call Number UAI @ alexi.delcanto @ Serial 1796
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Author (up) Di Lorenzo, A.; Pasqua, A.; Cardu, M.; Godio, A.; Seccatore, J.
Title Simplified methods of geomechanical analysis for small-scale underground mining. Type
Year 2019 Publication 14th International Congress on Rock Mechanics and Rock Engineering Abbreviated Journal ISRM 2019
Volume Issue Pages
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Abstract
Address
Corporate Author Thesis
Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN ISBN 978-0-367-42284-4 Medium
Area Expedition Conference
Notes Approved
Call Number UAI @ eduardo.moreno @ Serial 1313
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Author (up) Dragano, M.A.; Seccatore, J.; Cardu, M.; Marin, T.; Bettencourt, J.
Title Influence of blasting charges and delays on the energy consumption of mechanical crushing Type
Year 2019 Publication REM – International Engineering Journal Abbreviated Journal REM
Volume 72 Issue 2 Pages
Keywords
Abstract
Address
Corporate Author Thesis
Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 2448-167X ISBN Medium
Area Expedition Conference
Notes Approved
Call Number UAI @ eduardo.moreno @ Serial 1306
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Author (up) Espinoza, C.; Seccatore, J.; Herrera, M.
Title Chilean artisanal mining: a gambling scenario Type
Year 2020 Publication REM – International Engineering Journal Abbreviated Journal REM
Volume 73 Issue 2 Pages
Keywords
Abstract
Address
Corporate Author Thesis
Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 2448-167X ISBN Medium
Area Expedition Conference
Notes Approved
Call Number UAI @ eduardo.moreno @ Serial 1311
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Author (up) Godio, A.; Seccatore, J.
Title Measuring the Reduction of the Confinement along the Evolution of a Burn Cut Type
Year 2019 Publication Applied Sciences-Basel Abbreviated Journal Appl. Sci.-Basel
Volume 9 Issue 23 Pages 17 pp
Keywords blasting; vibrations; burn cut
Abstract We provide an analysis of a tunnel opening cut in a tunnel face. In particular, we focus on the effect of a “burn cut,” which is a typical parallel hole cut. As the evolution of the opening consists of an increase in the volume of the cut prism and the consequent reduction of confinement of the holes along the initiation sequence, we analyze such an evolution using photographic documentation, as well as evaluating the reduction of confinement by measuring the energy transferred from the explosive charge to the rock mass. The energy was estimated by monitoring and analyzing the vibrations induced by the blasting at three different points. We adopted low-cost shock sensors for monitoring the effect of the detonation times at short distance from the blast (about 10 m). The results show an evident reduction of the shock transfer to the rock mass (i.e., a reduction of confinement) with the increase of the cavity opening. Nevertheless, when only the response of the piezometric sensors was considered, a disparity in behavior among the sensors was noted. On the other hand, when the sensor response was integrated over time, the behavior of all sensors normalized, showing the need to focus both on the oscillation and the duration to properly address the shock effect.
Address [Godio, Alberto] Politecn Torino, DIATI, I-10133 Turin, Italy, Email: alberto.godio@polito.it;
Corporate Author Thesis
Publisher Mdpi Place of Publication Editor
Language English Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 2076-3417 ISBN Medium
Area Expedition Conference
Notes WOS:000509476600035 Approved
Call Number UAI @ eduardo.moreno @ Serial 1096
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Author (up) Seccatore, J.
Title A review of the benefits for comminution circuits offered by rock blasting Type
Year 2019 Publication REM – International Engineering Journal Abbreviated Journal REM
Volume 72 Issue 1 Pages
Keywords
Abstract
Address
Corporate Author Thesis
Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 2448-167X ISBN Medium
Area Expedition Conference
Notes Approved
Call Number UAI @ eduardo.moreno @ Serial 1305
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Author (up) Seccatore, J.; de Theije, M.
Title Socio-technical study of small-scale gold mining in Suriname Type
Year 2017 Publication Journal Of Cleaner Production Abbreviated Journal J. Clean Prod.
Volume 144 Issue Pages 107-119
Keywords Artisanal mining; Suriname; Gold; Mercury
Abstract Small-scale gold mining is Suriname's main economic sector, producing about two thirds of the nation's gold. Despite this, the sector is only very loosely regulated and most small-scale mining activities are informal. Surinamese miners are only a minority: the majority are Brazilian migrants, who have no right to the land and therefore have to pay a percentage of their production for land use. This study reports the findings of a field mission to small-scale mines in the region of Brokopondo reservoir. We document the technical aspects of small-scale gold mining in Suriname and contextualize this technology to social issues to identify links with cultural, political and sociological factors. Our findings show that informality and insecurity lead to a mine management culture that applies short-term solutions, such as cheap but polluting and inefficient technologies, and fails to produce stable, long-term mining conditions for clean, efficient technology and secure business planning. We conclude that the social context of the mining economy in Suriname strongly interacts with the technologies employed. (C) 2016 Elsevier Ltd. All rights reserved.
Address [Seccatore, Jacopo] Adolfo Ibanez Univ, Fac Sci & Engn, Vina Del Mar, Chile, Email: jacopo.seccatore@usp.br
Corporate Author Thesis
Publisher Elsevier Sci Ltd Place of Publication Editor
Language English Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0959-6526 ISBN Medium
Area Expedition Conference
Notes WOS:000393249300011 Approved
Call Number UAI @ eduardo.moreno @ Serial 698
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Author (up) Seccatore, J.; Gonzalez, P.; Herrera, M.
Title Peculiarities of drilling and blasting in underground small-scale mines. Type
Year 2020 Publication REM – International Engineering Journal Abbreviated Journal REM
Volume 73 Issue 3 Pages
Keywords
Abstract
Address
Corporate Author Thesis
Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 2448-167X ISBN Medium
Area Expedition Conference
Notes Approved
Call Number UAI @ eduardo.moreno @ Serial 1312
Permanent link to this record