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Keywords: stope
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Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1231
... of the backfill quality at the plant and improve backfill performance underground. Improved backfill quality will ensure long-term stope stability, improve safety, and reduce backfill operational costs. 1. Introduction Backfill is an important component of underground mining operations and is a critical part...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0231
.... A binder of slag (80%) and general-use Portland cement (20%) is employed in the production of the pastefill. Prior to 2017, stopes were systematically filled with 8% binder (by weight) in the plug pours and 4% binder (by weight) in the mass pours. Between 2016-2017, a study was carried to better understand...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-1629
... the FoG events, empirical methods and numerical methods were used. The Bamangwato Concessions Limited (BCL), an underground mine located in Selibe-Phikwe, Botswana, was used as a case study where FoG events that occurred in various stopes and other excavations were recorded. Overall, two aspects...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-1679
... ABSTRACT: Evaluating stope performance is important for improving stope stability, production efficiency, and profitability. Underground mines are Operating at greater depths where workers and excavations are exposed to hazards such as seismic events, which are not addressed by standard...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-1948
... ABSTRACT: This paper describes a case study of early mining at the Kittilä Mine and the recovery of the first sill pillars in the Roura and Suuri orebodies. Mining of the first secondary stopes in Roura led to local instability. Both footwall and hanging wall contacts consisted of tightly...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-2063
... ABSTRACT: This paper evaluates the stability of drives excavated in paste-filled stopes that have been previously mined out. Stability of the drives is important as the vibrations generated during the drilling and blasting processes affect the stability of the drives in low-strength paste...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-2021
... ABSTRACT: Optimal stope dimensions for underground mining using sublevel stopping method are decided ensuring excavation stability. Stability graph method developed by Mathews, et al. (1980), later modified by different authors is used as an analytical tool to achieve this purpose. Mathews' B...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-508
... ABSTRACT: Geotechnical characterization of rock masses in underground mines often involves physical measurements in supported excavations. However, unsupported stopes and drifts prevent safe access for mapping by geotechnical personnel. The advent of inexpensive, open platform unmanned aerial...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-1027
... Upstream Oil & Gas time window US government seismic hazard Reservoir Characterization stope seismic event sensor relative stress level asei trend vein pillar rock mass rockburst seismic activity mining area mining seismicity energy index method asei value 1. INTRODUCTION Mining...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-1012
... ABSTRACT: The blasting of mining stopes is an important driver for mine seismicity. The factors controlling seismic response are not well understood. Mines mostly rely on the number of events and associated moment magnitudes. Geological and operational parameters are often neglected although...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-1172
... ABSTRACT: The Doe Run Resources Corporation Southeast Mining and Milling division (SEMO) mines lead, zinc, and copper in the Missouri lead belt using the room and pillar mining method. Retreat mining of pillars is then performed, resulting in large nonentry open stopes. The extent of pillar...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-516
... efforts using UAVs for capturing geologic data, as well as to help monitor stability in areas that are inaccessible. geologic modeling metals & mining knowledge management geological modeling Reservoir Characterization obstacle Bentley nev stope remote controller orientation UAV...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-815
.... Hecla Mining Company and the Spokane Mining Research Division of the National Institute for Occupational Safety and Health have worked collaboratively for several years to better understand the geomechanics of cemented paste backfill (CPB) and thereby improve safety in underhand stopes. This work has...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-246
... carried out in footwall rock at 70’L, (-) 30’L and below levels and it has improved the mineable manganese ore by about 17%. The paper presents rock mechanics investigations and changes in stoping method for better safety and productivity at Munsar Mine. 1. INTRODUCTION MOIL is producing annually more...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-730
... to single and adjacent vertical backfilled stopes as well as through the CPB material. Through discussions on modeling parameters and output results, one is provided with insights into the mechanisms of stress redistribution allowing for further accuracies in simulating the behavior of the CPB material...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-280
... the magnitude of strains measured by a multi-point borehole extensometer and the changing geometry of the hanging wall. To test the SERF method, extensometers were installed in stope hanging walls of at a narrow vein gold mine. Deformation data was collected from the extensometers through the undercutting...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-1031
... seismic data seismic hazard stope Upstream Oil & Gas seismic event rock mass seismic activity mining vein pillar rockburst mining area seismicity energy index method asei value time window sensor relative stress level asei trend 1. INTRODUCTION Mining-induced seismicity has been...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-0814
... ABSTRACT The stability graph method has been used for more than three decades for the design of stopes in sublevel stoping mining operations. This method estimates the stope size required to reduce operational hazards and achieve continuous production. Over time several improvements have...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-0531
... ABSTRACT: Hanging wall (HW) sloughage is one of the main sources of ore dilution in underground open stope mines. This paper presents the results of a series of numerical analyses performed to investigate HW sloughage potential in open stope underground mines. Hybrid DFN-3DEC models were...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-0890
... to the stress state and damage in the rock. Specifically, we consider data recorded during three sequential time intervals associated with the excavation of a stope during the start of the second interval. We observe a high-velocity anomaly in the first interval that is located to the edge of the future stope...

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