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New Conceptualization and Uses of Pore Pressure Model for Large Open Pit Mine

This project consists of the re-calibration of the hydrogeological model of a large open pit mine based on a new conceptual hydrogeological analysis performed by Itasca and the model improvements achieved based on this new conceptual understanding. The project and its results highlight the importance of conceptual hydrogeological models and understanding and their impact on the results and predictions of their numerical counterparts. Furthermore, the model was later used to provide pore pressure distributions for slope stability analyses and to test the effectiveness of different depressurization and dewatering plans for the pit.

Large-scale Footwall Stability at the LKAB Kiirunavaara Mine

The Kiirunavaara Mine, located near the city of Kiruna in northern Sweden, is a large-scale sublevel caving (SLC) operation producing 28 Mt (million metric tons) of iron ore per year. Originally an open pit operation, the mine later transitioned to underground SLC operations in the late 1950s. As mining has progressed deeper, a damaged zone in the footwall has been noted during annual damage mapping of decommissioned infrastructure left behind from previous mining stages. The rock mass fracturing associated with the damaged zones was explicitly studied by a set of models in PFC. These models focused on the interaction between the caving hangingwall, the developing cave rock zone, and the footwall damage development.

Mesa Verde Arch Analysis

Mesa Verde National Park, located in southwestern Colorado, is the site of Spruce Tree House, which is the third largest and best-preserved cliff dwelling in the Park. The nose of the alcove contains a thin arch delineated by a persistent curved crack, which extends about 270 ft north from above the south end of the alcove. Recently, rockfalls from the arch and adjacent rock surfaces demonstrated the need for a new assessment of arch stability and stabilization. Itasca was retained by the National Park Service (NPS) to investigate the arch, conduct a stability assessment, conduct 3D modeling, identify remediation options, recommend the preferred option, and estimate construction costs.

Slope Stability Analysis for T.H. 53 Relocation

This rock discontinuity characterization and slope stability assessment was part of the Highway 53 (T.H. 53) relocation project (completed September 2017). After collecting rock discontinuity information in an extensive field campaign, UDEC and 3DEC models were utilized to confirm that the mechanism of failure along the slopes is flexural toppling and the factor of safety is acceptable.

Three-Dimensional Stability Analysis in an Open-Pit Iron-Ore Mine

An iron-ore open-pit mine exhibited outcrops of friable rock units with a high contrast in rock stiffness between the different rock units of the deposit and a presence of a shear band in between units. This project was aimed at understanding the failure mechanisms acting on the slopes.

Mine Dewatering in a Compartmentalized Hydrogeologic Setting at Sishen Mine in South Africa

A three-dimensional groundwater flow model was constructed for Sishen Mine. The purpose of the model is to predict the required dewatering rate and boreholes to maintain dry working conditions in the mine.

ROCK MECHANICAL ANALYSES FOR THE BOLIDEN DEEP REPOSITORY AT RÖNNSKÄR

Boliden AB is constructing an underground repository for final storage of process waste material from the Rönnskär copper smelter facility. Itasca was contracted by Boliden to carry out rock mechanical analysis to assess the stability in both the short- and long-term (3000 years) perspectives. FLAC3D and 3DEC models were used to study global and local stability as well as the potential for long-term effects on flow paths in the rock mass resulting from the excavation of the repository.

Simulation of 3D Pore‐Pressure Distributions for Slope Stability Analysis

MINEDW was used to simulate pore‐pressure distributions at the Chuquicamata open‐pit mine slope in Chile, which is the largest copper mine in the world by excavated volume.

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