Guidelines for open pit slope design in weak rocks / editors, Derek Martin and Peter Stacey.

Academic

1 Introduction Peter Stacey and Derek Martin1.1 Background 1.2 General descriptions and definitions for weak rocks 1.3 Slope design terminology 1.4 Design implications 1.5 Design implementation 2 Field data collection and methodology Peter Stacey and Derek Martin2.1 Introduction 2.2 General field descriptions 2.3 Field mapping 2.4 Core logging, sampling and sample preservation 2.5 Laboratory testing 2.6 In-situ borehole characterisation 2.7 Summary 3 Weak rock strength models Derek Martin and Peter Stacey3.1 Introduction 3.2 Geological and structural models 3.3 Role of rock mass classifications systems 3.4 Shear strength and failure criteria of weak rocks in laboratory tests 3.5 Erodibility/degradability 4 The role of water in slope design for weak rocks Geoff Beale4.1 Introduction 4.2 Hydrogeological background 4.3 Groundwater characterisation 4.4 Development of a conceptual hydrogeological model 4.5 Analysis and modelling of pore pressure 4.6 Depressurisation of weak rocks 4.7 Characterisation of surface water 5 Slope design considerations Derek Martin, Loren Lorig and Peter Stacey5.1 Introduction 5.2 Modes of failure 5.3 Instability mechanisms 5.4 Stability analyses and predictions 5.5 Limit equilibrium analyses 5.6 Numerical approaches 5.7 Role of back analyses 5.8 Acceptance criteria 5.9 Summary 6 Cemented sediments Derek Martin and Pete Stacey6.1 Introduction 6.2 General geological setting 6.3 Hydrogeology 6.4 General geotechnical properties 6.5 Slope design considerations 6.6 Goldstrike Betze-Post open pit, Nevada: instability in the Carlin Formation 6.7 Nine Points slope failure at Newmont's Gold Quarry open pit 6.8 Overview of open pit experience in cemented (alluvium) gravels found in South-western United States 6.9 Ministro Hales Mine, Codelco: bench failure in massive gravels 7 Weak sedimentary mudrocks Derek Martin and Pete Stacey7.1 Introduction 7.2 General geological setting 7.3 Hydrogeology 7.4 General geotechnical properties 7.5 Slope design considerations 7.6 Voorspoed Mine, South Africa: open pit diamond mining in weak mudrock 7.7 Rio Tinto Minerals Boron operation: design considerations for weak lakebed sedimentary rocks 8 Weak sedimentary coal, chalk and limestone John Simmons, Patrick Ebeling and Peter Stacey8.1 Introduction 8.2 General geological setting 8.3 Slope design considerations 8.4 Weak coal measures 8.5 Chalk and weak limestones 9 Saprolite: weathered rock and residual soil Derek Martin and Pete Stacey9.1 Introduction 9.2 Terminology 9.3 Weathering processes and geology 9.4 General geotechnical properties 9.5 Hydrogeology 9.6 Slope design considerations 9.7 Cowal Gold Mine: back analysis 9.8 Newmont Boddington Gold: slope design optimisation in oxide/saprolite 10 Soft iron ores and other leached rocks Paulo Franca, Teofilo Costa and Peter Stacey10.1 Introduction 10.2 Background 10.3 Soft iron ores: geology 10.4 Soft iron ores: geotechnical characteristics (Teofilo Costa and Gilvan Sa) 10.5 Weathered country rocks 10.6 Hydrogeology of soft iron ores and associated rocks 10.7 Leached quartzites and quartzitic sediments 10.8 Slope performance and case histories 11 Hydrothermally altered rocks Peter Stacey and Derek Martin11.1 Introduction 11.2 General geological setting 11.3 Geotechnical properties 11.4 Hydrogeology11.5 Slope stability and engineering geology at the Pierina Mine 11.6 Instability in weak rocks, El Tapado Pit north wall, Yanacocha Operation 11.7 Lihir Open Pit Mine in argillic materials 12 Design implementation and operational considerations Peter Stacey, Paulo Franca and Geoff Beale12.1 Introduction 12.2 Mine planning 12.3 Design implementation 12.4 Surface water control 12.5 Slope protection 12.6 Performance assessment and monitoring 12.7 Ground control management plans 12.8 Mine closure