The Time Value of Risk - A Case Study at the Boron Operations Open Pit Mine

Persistent Link:
http://hdl.handle.net/10150/195258
Title:
The Time Value of Risk - A Case Study at the Boron Operations Open Pit Mine
Author:
Yost, Raymond Richard
Issue Date:
2009
Publisher:
The University of Arizona.
Rights:
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Abstract:
The evaluation of risk is often performed assuming static conditions when in reality, conditions are continually evolving. In the following dissertation, the evaluation of risk with changing conditions over time is considered for a specific project - placing overburden into an active, open pit mine. The research focuses on the geotechnical components of risk with the goal of identifying whether and to what extent it is possible to place overburden on mined out portions of the open pit slopes. The relevant factors, which change with time or impact risk, are first identified and an evaluation is performed to estimate a probability of failure at various stages of the project life. Potential damages are then assessed by first evaluating the run out distance and post failure geometry of a slope failure and then estimating the percentage of material that would have to be removed to continue extraction of ore. To convert the uncertainty into economic terms, unit values for savings that result from placing overburden in the pit and costs associated with cleaning up failure debris are estimated. The probability of failure, potential for cleanup, and unit values are combined to produce estimates of the likely costs and benefits associated with dumping overburden in the open pit.The results of the analysis indicated that risk varies considerably with time. However, it is possible to place overburden in the central portion of the open pit up to a limit of approximately 80 million tons while maintaining a positive net value of expected costs and benefits.
Type:
text; Electronic Dissertation
Keywords:
in-pit dumps; probability; risk
Degree Name:
Ph.D.
Degree Level:
doctoral
Degree Program:
Mining Geological & Geophysical Engineering; Graduate College
Degree Grantor:
University of Arizona
Advisor:
Kemeny, John
Committee Chair:
Kemeny, John

Full metadata record

DC FieldValue Language
dc.language.isoENen_US
dc.titleThe Time Value of Risk - A Case Study at the Boron Operations Open Pit Mineen_US
dc.creatorYost, Raymond Richarden_US
dc.contributor.authorYost, Raymond Richarden_US
dc.date.issued2009en_US
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.description.abstractThe evaluation of risk is often performed assuming static conditions when in reality, conditions are continually evolving. In the following dissertation, the evaluation of risk with changing conditions over time is considered for a specific project - placing overburden into an active, open pit mine. The research focuses on the geotechnical components of risk with the goal of identifying whether and to what extent it is possible to place overburden on mined out portions of the open pit slopes. The relevant factors, which change with time or impact risk, are first identified and an evaluation is performed to estimate a probability of failure at various stages of the project life. Potential damages are then assessed by first evaluating the run out distance and post failure geometry of a slope failure and then estimating the percentage of material that would have to be removed to continue extraction of ore. To convert the uncertainty into economic terms, unit values for savings that result from placing overburden in the pit and costs associated with cleaning up failure debris are estimated. The probability of failure, potential for cleanup, and unit values are combined to produce estimates of the likely costs and benefits associated with dumping overburden in the open pit.The results of the analysis indicated that risk varies considerably with time. However, it is possible to place overburden in the central portion of the open pit up to a limit of approximately 80 million tons while maintaining a positive net value of expected costs and benefits.en_US
dc.typetexten_US
dc.typeElectronic Dissertationen_US
dc.subjectin-pit dumpsen_US
dc.subjectprobabilityen_US
dc.subjectrisken_US
thesis.degree.namePh.D.en_US
thesis.degree.leveldoctoralen_US
thesis.degree.disciplineMining Geological & Geophysical Engineeringen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.contributor.advisorKemeny, Johnen_US
dc.contributor.chairKemeny, Johnen_US
dc.contributor.committeememberZavodni, Zavisen_US
dc.contributor.committeememberMomayez, Moeen_US
dc.contributor.committeememberMeko, Daviden_US
dc.identifier.proquest10220en_US
dc.identifier.oclc659750817en_US
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