open pit slopes under such conditions can present a variety of operational and slope stability problems. Slope design approaches and excavation procedures which are flexible and capable of adapting to changing conditions are essential for rational slope development.
May 06, 2011· This is particularly so because the most unstable parts of the earth are at the plate boundaries and it is also here that young fold mountain belts are formed and there are high relief and steep slopes Most open pit operators are familiar back break form blast, but most people only consider the visible breakage behind the row of holes of the ...
In 1996 a slope failure occurred at the Round Hill open pit mine, operated by Macraes Mining Company Ltd. The failure as shown in Figure 1, involved three benches at an intermediate slope that was being pushed back towards the final high wall location. Figure 1. Photograph of pit area involved with slope failure. The slope failure was well documented.
Pit slope depressurization normally occurs as a result of groundwater flow, either to seepages faces, or to pumping wells, drains or other installed systems.
Geotechnical considerations open pit audit – guide Page 2 of 28 Introduction This document was reformatted in November 2015. At this time no material changes were made to the content of the guide, which was originally published in September 2009 under the title Guide to open pit geotechnical considerations HIF audit 2009.
With the variability of commodity prices and the constant increase of mining costs, it has become increasingly important to optimize pit slopes of mines, taking into consideration the complexity and the uncertainties presented by ground conditions.
Open pit slopes have the advantage of removing the influence of morphological features, vegetation, and liquefiable substrates while controlling the travel path angle and roughness. In such a controlled environment, landslide mobility has a strong sensitivity to slope angle, material properties, and fall height, and is only modestly sensitive to volume.
coal seams in basin contain water bearing strata (aquifer). Open pit mine development in such situation requires dewatering and depressurization of the aquifers through continuously pumping out of water to keep the mine pit dry and maintain safe working conditions. This .
Owners of a large openpit mine in the United States embarked on a program to minimize ongoing risks and plan for responsible closure after the ore body is exhausted. The owner's concern centered on how a proposed pit lake – the body of water that may form in the mine pit due to natural surface and ground water infilling – would impact pit rock wall stability.
Activities involve pit dewatering/depressurization, slope monitoring, blast damage assessment, etc. • Leadership over a staff of 7 engineers and supervisors with varying degrees of expertise in analysis, instrumentation, remediation and other aspects of geotechnical engineering in a multipit environment.
Provide governance and high level standards (according CDA, MAC, ICMM and development the implementation) to all business units in Peru and Brazil (operations and projects), mentoring and leadership technical services support to all major structures (TSF, Waste Dumps, HLP, Open Pit Slope Design, Underground Geomechanics).
Based on comprehensive field hydrogeological data collection and interactive numerical groundwater and geotechnical modeling, it is possible to evaluate the water pore pressure effect on the pit slope, to provide an efficient depressurization strategy to meet the geotechnical engineering targets, and thus to develop costeffective mine plans.
The secondary dewatering strategy focused on depressurization of lowerpermeability zones along the pit perimeter and inside the pit. A combination of active and passive measures, such as vertical inpit wells and horizontal drains, was used to meet the pit slope design criteria.
Our Open Pit Geotechnical Services Include: Investigation of slope failures and recommendations for remediation Collection of geotechnical data including surface mapping, photogrammetry, oriented core, televiewer, geomechanical core logging, soils logging, etc. Experts on geotechnical instrumentation and slope monitoring programs.
Sep 27, 2010· Terminology OVERALL PIT SLOPE ANGLE: The angle measured from the bottom bench toe to the top bench crest. It is the angle at which the wall of an open pit stands and it is determined by rock strength, geologic structures and water conditions. 5 7. Terminology The overall pit slope angle is affected by the width and grade of the haul road. 5 8.
This is a technical role in geotechnical and geothermal operation in an open pit mine. The role responsibility includes slope monitoring and data analysis of the pit and dump slopes, design implementation of slope designs and reviewing pit designs, develop and review existing systems to ensure accurate capture of all monitoring data.
Mining under an open pit slope results in the collapse and slide of the slope. In this paper, a combination of methods including Google Earth and field investigations is applied to investigate the process of eastern slope failure induced by underground mining in the Yanqianshan Iron Mine over five years. According to the observed ground deformation features, the geomorphic zone of the eastern ...
It is directed to determine slope design parameters of the Mimbula pit 2, which is an important satellite pit of the Nchanga open pits. Attention has been drawn to the need to understand the failure mechanisms of slopes on this site and the need to determine acceptable risk of mining at the designed pit slopes.