4D geotechnical hazard assessment
One application of Geohazmap by Golder pertained to the hazard assessment for the feasibility study of a planned open pit operation in northeastern Ontario. We were able to evaluate and subsequently weight a number of areas of concerns for pit stability, including proximity to faults, weak rock mass and existing drifts and underground stopes, as well as to compare the orientation of the pit wall to that for the main bedding sets. A hazard workflow was used to generate overall hazard indices that were draped on the planned pit shells, allowing the geotechnical engineers to highlight the areas with higher hazards to the mine team. This assisted in defining the critical design sectors, appropriate acceptance criteria for the pit slope design, and determining the best location for the ramp.
We have years of experience in 4D-GIS based geotechnical hazard assessment for open pit and underground mining projects. Our team has the skills and technologies to forecast the geotechnical hazards quantitatively for design or real-time monitoring applications by combining all the relevant geological and geotechnical observations. We transform rock type, structure, rock quality, seismicity, deformation, support, geometry, production, and other data into a set of spatially modelled, normalized, and weighted hazard criteria that are combined into an overall hazard estimation. It is an expert-system approach providing continuous access to the input data and interpretation in order to build confidence through the visual, as well as statistical, validation of hazard zones. We have successfully executed geotechnical hazard assessment projects at mine sites around the world, from forecasting rockburst and water inflow hazards in deep Canadian mines, to slope stability hazards in large South African open pits, and on to roof fall hazards in Australian coal mines.
We use our own GOCAD/SKUA-based Geohazmap Worklow and specialized databases to provide a powerful solution for geotechnical hazard estimation and monitoring, including true 4D back-analysis. The system computes geotechnical hazards using either a knowledge-driven or a data-driven approach. It makes full use of intrinsic 3D surface modelling, solid modelling, and geostatistical functionality. Complex relationships among geology, structure, stress, and seismic data are handled by the underlying power of object data structures and the spatial modelling engine. It handles any type of ground failure or hazard for which objective criteria can be developed. Users define how criteria are spatially, temporally, and quantitatively related to hazards.
Combines a 3D-GIS query environment with a 4D relational data management system. Brings together true 4D multi-disciplinary data management, modelling, query, and expert-system analysis on a single platform. The technology is especially suited to the dynamic data routinely encountered in mining and provides direct support for time-dynamic assessments of geotechnical hazards.
Data we work with
We ensure fast, intuitive, and accurate 3D earth models, regardless of your data types. We work with geological, geophysical, geochemical, and geotechnical data from standard mining industry formats: ArcGIS, MapInfo, AutoCAD, GOCAD/SKUA, Gemcom, Surpac, CAE Studio, Vulcan, Geosoft, Leapfrog, ER Mapper, ioGAS, UBC-GIF, VPmg, Profile Analyst, Maxwell, and others.
Expertise and experience
Our specialized geotechnical hazard analysis services rely on the experience of a seasoned team that has worked on a great variety of international projects. Whatever the particular hazard under analysis (for example, slope failure, rockburst, or water inflow), our team has the skills to integrate complex, multidisciplinary datasets to identify locations where specific combinations of hazardous conditions exist. Our straightforward process facilitates the definition of hazard assessment objectives, individual hazard criteria, and modelling actions. Our team has the experience to work with you to translate conceptual hazard models into data requirements and modelling actions across a wide spectrum of mine types and specific hazard conditions. We provide guidance and services from model construction to our unique 4D quantitative back-analysis process.
Rio Tinto asked Mira Geoscience to develop a customized geotechnical data management and hazard assessment system for its block cave mines. The essence of the system is the management of 4D geotechnical and production data for multiple purposes, including providing a foundation for hazard assessment. Customized geohazard reports and dashboards integrate data from multiple sources to provide for the timely assessment of the evolution of underground geotechnical hazards. The system is currently implemented in several of Rio Tinto’s international block cave mines.