Underground Aggregate Mining Short Bench Blasting Technique

CIM Montreal 2015
Mike Koehler (ISEE)
This presentation highlights a cost effective technique for vertical bench blasting at underground aggregate mining operations. After driving the horizontal advance, the mine in this case study develops a second vertical bench that is approximately seven meters deep. Historically, the vertical bench was drilled and blasted to full depth in one cut. The short benching technique is to blast the vertical bench in two separate lifts. The first lift is drilled only three and a half meters deep and is mucked out and scaled after the blast. Although several line items are increased, such as drill set-up time, the shorter bench program has provided substantial cost savings. This technique speeds the drilling process by eliminating the need for the driller to change steels. Additionally, short benches have provided a vast reduction in scaling time, and notably reduced pillar damage.
Keywords: Underground Mining, Vertical Bench, Cost Effective, Blasting, Explosives, Aggregate
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Summary: Induration furnaces are difficult to control in optimal way, as it is highly interactive with long time delays on the pellet side, contrasting with very rapid response on the gas side. In addition, the high level of interaction makes the process inherently difficult to control tightly with the conventional controls that are usually implemented.
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Summary: Mining related tailings and water management facilities occupy a significant footprint in the natural environment. Effective management and technical standards are required to reduce impacts and risks associated with the life cycle of these facilities, starting at the exploration phase. This paper sets out a framework for the minimum management processes and technical requirements that mining companies should address in the planning, design, construction, operation and closure of tailings...
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Summary: Modern tailing dam designs evolved with and from the developing state of practice for water dams, since the mid 1960’s and continue to evolve today. Tailing dams are a unique variation of water dams and, while the geotechnical principles used for water dams apply equally to tailing dams, there are distinct differences in design of the dam section. Implementation of good design practice starts with understanding the site conditions, properties of the tailings, and geotechnical properties of...
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Proceedings: CIM Montreal 2015
Author(s): Terry Eldridge
Keywords: Tailings Management, Review Board
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Summary: Responsible tailings disposal at Minnesota taconite mines
P. B. Solseng, Barr Engineering Co., USA
T. W. Skoglund, Barr Engineering Co., USA
Abstract
Tailings disposal has been taking place in Minnesota’s iron range for over 100 years, first with the wash plants from the high grade ore and since the 1950’s, with taconite. Taconite is about 35 percent iron so about 65 percent of the mined ore is tailings. This paper discusses the practices currently used for tailings disposal in Minnesota. ...
Proceedings: CIM Montreal 2015
Author(s): Philip Solseng
Keywords: dam design, tailings, transportation tailings, reclamation
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Summary: Mining companies are facing increasingly complex business challenges. As capital budgets shrink, return on investment (ROI) becomes more important. Ore prices often rise or fall dramatically without warning, increasing the pressure to maximize productivity and eliminate unplanned downtime. With cuts to operational and maintenance resource allocations, your organization may struggle to cost-effectively manage assets, carry out preventive maintenance work and proactively address quality issues....
Proceedings: CIM Montreal 2015
Author(s): Martin Provencher
Keywords: Maintenance, Real time, Data, Analytics, Smarter Mining, Predictive, Innovation, Costs
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Summary: Crushed rock size is an important variable for primary grinding mills operation. While traditional 2D vision systems perform well for many kinds of SAG feed materials, they fail to measure adequately AG feed iron ore particle size distributions (PSD). Three dimensional cameras are proven to produce accurate PSD measurement for this type of material. A technique developed at COREM that overcomes the limitations of 2D segmentation vision systems by using 3D cameras and appropriate processing...
Proceedings: CIM Montreal 2015
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Summary: This presentation highlights a cost effective technique for vertical bench blasting at underground aggregate mining operations. After driving the horizontal advance, the mine in this case study develops a second vertical bench that is approximately seven meters deep. Historically, the vertical bench was drilled and blasted to full depth in one cut. The short benching technique is to blast the vertical bench in two separate lifts. The first lift is drilled only three and a half meters deep...
Proceedings: CIM Montreal 2015
Author(s): Mike Koehler
Keywords: Underground Mining, Vertical Bench, Cost Effective, Blasting, Explosives, Aggregate
Year: 2015
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Summary: Several recent publications have addressed the way Tailings Management Facilities (TMF) are designed and operated in Canada, and in Quebec in particular. The stability assessment can no longer account only for one final configuration, but must take into account the different stages in the TMF development in order to address the increasingly complex design schemes put together to answer the challenging environmental and social context of mining projects. Even though complex design tools for...
Proceedings: CIM Montreal 2015
Author(s): Mayana Kissiova
Keywords: management, tailings, stability
Year: 2015
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Summary: Geophysical techniques are used in prospecting for natural resources on Earth. One such technique is ground gravity surveying, in which highly sensitive gravimeters are used to make measurements of the local gravity field strength at many locations on the ground in an area being surveyed. Variations in those measurements reflect variations in the density of the rock beneath the survey area, which in turn can provide indications of the local geology, from which potential locations of valuable...
Proceedings: CIM Montreal 2015
Author(s): Kieran Carroll
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Summary: Underground mining last underwent a major transformation in the 1940s and 50s with the introduction of mechanized equipment. New technologies, mining methods and work practices were developed that resulting in new mining flow sheets that drove significant commercial value.

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Proceedings: CIM Montreal 2015
Author(s): Michael MacFarlane
Keywords: transformation, continuous, CMIC, adaptation, underground mining, innovation, roadmap
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Summary: In most major mining jurisdictions, mine closure is an amorphous concept with no clearly defined end. Completion criteria are often ambiguous, ill-defined, and inconsistent across jurisdictions resulting in uncertainty in approaches to mine closure for operators, unclear standards for regulators, and confusion for communities and stakeholders at large. Furthermore, the lack of a defined end for site relinquishment often leads to the management of sites in perpetuity and, should a company...
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Summary: Water quality monitoring is one of the most time-consuming and costly components of environmental baseline monitoring programs for mine developers and operators. The monitoring is a core component of the environmental assessment process as well as a practical tool for environmental management throughout the mine life cycle.

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Summary: Atlas Copco, one of the world’s largest manufacturers of mining equipment, has partnered with the Northlands College Mine School, located in northern Saskatchewan, Canada, to develop efficient and cost effective methods to train people to operate mining equipment. Northlands and Atlas Copco will use state of the art Atlas Copco simulators to train and certify entry level and advanced underground miners. This presentation will provide background on the history of the development of mine...
Proceedings: CIM Montreal 2015
Author(s): Al Charbonneau, Kelvin (Toby) Greschner, Colleen Durocher
Year: 2015
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Summary: For the past 15 years, COREM, with its unique approach in research, has created numerous innovations for the mineral processing industry. Its highly qualified team, flexible pilot plant and complete laboratories are fundamental in the success of the organisation, but being able to rely on key strategies has also shown to be essential in maximizing the hit rate of COREM’s research program. Always keeping a well-balanced research program portfolio, working with the right partners at the right...
Proceedings: CIM Montreal 2015
Author(s): Philippe Gagnon,
Year: 2015
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Summary: In this paper we discuss the advantages of using an admittance-based digging algorithm to issue the high frequency commands required to load a bucket with fragmented rock. Currently these commands must be provided by an expert human operator, working with limited environmental feedback. These high frequency digging commands become ineffective if there is significant communication delay between the operator and the mining vehicle, as would be the case on many celestial bodies. The admittance-b...
Proceedings: CIM Montreal 2015
Author(s): Andrew Dobson, Joshua Marshall
Keywords: Loading, Robotic, Remote, Digging, Mining, Planetary, Communications, Autonomous
Year: 2015
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Summary: Agnico Eagle’s Goldex operation is a low grade gold mine located in the Abitibi region of North-western Quebec, approximately 650 km north of Montreal. Upon startup in 2008, mining was focused on the Goldex Extension Zone ("GEZ"), using a novel bulk mining method. However, ore production from the GEZ had to be suspended in October 2011 due to geotechnical concerns with the rock above the mining horizon. During the suspension, work on site focused on monitoring, assessment and remediation. ...
Proceedings: CIM Montreal 2015
Author(s): Frederic Langevin
Keywords: mining method, Mining, Low costs
Year: 2015
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Summary: Agnico Eagle’s flagship LaRonde Mine is exploiting a world class Au-Ag-Cu-Zn massive sulfide lenses complex. It is located in the Abitibi Region of northwestern Quebec, approximately 650 km northwest of Montreal. With more than 4 Moz of gold in proven and probable reserves, Laronde has one of the largest gold deposits of any mine operating in Canada. These reserves extend from surface down to 3,110m and remain open at depth. LaRonde’s ore production is around 6,300t per day with the...
Proceedings: CIM Montreal 2015
Author(s): Léon Grondin-Leblanc
Year: 2015
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Summary: A thorough review of global iron ore trade flows over the past decade is presented, highlighting trends and events that have shaped present day market dynamics. As China moved into a dominant role as the leading global consumer of iron ore, the rest of the world pursued strategies to meet increasing demand. Shifts in the market, government rulings, and the race to bring new capacity into production defined a new era in iron-ore economics. Large-scale production increases in Australia combined...
Proceedings: CIM Montreal 2015
Author(s): Christopher A. Tuck
Keywords: iron, trade, ore, world
Year: 2015