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Condition 10 Review Team - Final Report |
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Author: Chair: Mr Mark Logsdon (plus review team)
Date: February 2008
The State's approval for the Mine Waste and Tailings project to proceed was provisional on a number of conditions. One of these, Condition 10, called for the independent assessment of the proposed storage of the pyrite concentrate. A review team, consisting of five North Americans (inclusive of three Professors), undertook this comprehensive review between April 2007 and February 2008.
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Author: OTML
Date: September 2006
This document was prepared to support the State's granting approval of a Change Notice, to permit OTML to proceed with the Mine Waste and Tailings project (MWTP). It discusses the issue to be addressed (the fragile nature of the river system and the perceived increase in sulphur (up to 8%S) in tailings in the future), the likely riverine response and the proposal by which sulphur will be drastically decreased to <1%S. This document describes the flotation process, the pyrite concentrate (PCon) pipeline and the subaqueous storage of the PCon material. It also addresses rehabilitation of the Bige site. (Note that, due to size limitations, drawings and appendices have not been included in this posting.)
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Bayesian Modelling - Plain English Summary |
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Author: Water Science P/L (Dr B. Hart) and Monash University (Dr C Pollino)
Date: January 2006
This report presents a simplified version of the Bayesian Modelling final report.
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Bayesian Modelling - Final Report |
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Author: Monash University (Dr C. Pollino) and Water Science P/L (Dr B. Hart)
Date: December 2005
This report contains the result of a risk assessment, adopting Bayesian Network Modelling, undertaken to: assess the risks to the environmental Regime values in the Ok Tedi/ Fly River system from ARD production especially in the dredged material stockpiles at Bige; and test the effectiveness of various management options in mitigating these environmental risks. This risk assessment clearly demonstrated that without mitigation of tailings (subsequently addressed via the Mine Waste Tailings Project) ARD would result in unacceptable changes to the Regime values.
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Bayesian Modelling - Phase 1 Report |
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Author: Water Science P/L (Dr B. Hart) and Monash University (Dr C. Pollino and E. King)
Date: February 2005
Recognising the potential detrimental impact of increasing sulphur in tailings, OTML commissioned a review of all current information related to the ARD issue and used this information to assess the risk of unacceptable impacts to the environmental Regime's values. This report sumarises the outputs from Phase 1 of the project, undertaken between December 2004 and February 2005.
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Acid Rock Drainage Management at the Ok Tedi Mine, Papua New Guinea |
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Author: B. R. Bolton, H. Kundapen, S. Miller, C. Rumble and J. Jeffery
Date: July 2003
Paper originally published in the Proceedings of the 6th International Conference on Acid Rock Drainage held in Cairns, Australia, 14-17 July, 2003. Reprinted with the permission of The Australian Institute of Mining and Metallurgy,
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Development of an Empirical Geochemical Model (OkARD) to Predict ARD Risks |
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Author: S. Miller, C. Rumble, B. Bolton and K. Voigt
Date: July 2003
This paper, entitled Development of an Empirical Geochemical Model (OkARD) to Predict Acid Rock Drainage Risks from Mine Derived Sediments, Ok Tedi Copper and Gold Mine, Papua New Guinea, was originally published in the Proceedings of the 6th Annual International Conference on Acid Rock Drainage held in Cairns, Australia, 14-17 July, 2003. Reprinted with the permission of The Australasian Institute of Mining and Metallurgy.
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Geochemical Characteristics of River Deposited Mine Wastes and Associated Contact Waters |
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Report: PDF (1178kB)
Author: J. L. Pile, B. R. Bolton, H. Kundapen and H. Davies
Date: July 2003
This paper, entitled Geochemical Characteristics of River Deposited Mine Wastes and Associated Contact Waters Downstream of the Ok Tedi Mine, Papua New Guinea - Implications for ARD Management was originally published in the Proceedings of the 6th Annual Conference on Acid Rock Drainage held in Cairns, Australia, 14-17 July, 2003. Reprinted with the permission of the Australasian Institute of Mining and Metallurgy.
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Evaluation of Sulphide and Carbonate in Waste Rock Dumps and Operational Guidelines for ARD Control |
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Report: PDF (1070kB)
Author: C. Rumble, S. Miller, H. Kundapen and B. Bolton
Date: July 2003
This paper, entitled The Evaluation of Sulphide and Carbonate Distribution in Waste Rock Dumps and Development of Operational Guidelines for Acid Rock Drainage Control at the Ok Tedi Mine, PNG, was originally published in the Proceedings of the 6th International Conference on Acid Rock Drainage held in Cairns, Australia, 14-17 July 2003. Reprinted with the permission of the Australian Institute of Mining and Metallurgy.
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Review of Acid Rock Drainage Management Program |
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Report: PDF (239kB)
Author: Goechimica Inc
Date: January 2003
An independent review by Geochimica Inc of OTML's 2002 Acid Rock Drainage Management Program Report.
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Waste Geochemistry and Implications for Bige Dredge Operations, Progress Report |
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Report: PDF (206kB)
Author: Environmental Geochemistry International
Date: April 2001
This report provides an update on the then-current level of understanding of the factors influencing the acid-base characteristics of the dredged sands, and provides an assessment of the ARD risk associated with the current and future dredge sands. Recommendations for continued operation of the dredging operation are also provided.
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Technical review of the acid rock drainage program at Ok Tedi, Western Province, Papua New Guinea |
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Report: PDF (326kB)
Author: Mark Logsdon, Geochimica Inc
Date: February 2001
Mark Logsdon of US-based Geochimica Inc was engaged by OTML to provide an independent scientific review of OTML's ARD management program.
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Acid Drainage and Metal Leaching Potential of Waste Rock, Tailings and River Deposited Materials |
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Report: PDF (202kB)
Author: Environmental Geochemistry International
Date: June 1999
This model uses the mine plan together with outputs form teh sediment transport model to determine the potential risk of acid rock drainage in mine waste (tailings, waste rock, and dredged sediments) and in deposited mine waste sediments in river systems. Any reductions in pH (increase in acidity) predicted by the model are in turn fed into the dissolved copper model to assess any effects on metal concentrations in the rivers.
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