Ground Control Management at Alamos's Young Davidson Mine
- Y. Xu (Alamos Gold Inc.) | T. Blake (Alamos Gold Inc.) | X-T. Feng (Northeastern University / Laurentian University) | M. Cai (Northeastern University / Laurentian University) | Y. Xu (Northeastern University / Laurentian University)
- Document ID
- American Rock Mechanics Association
- 53rd U.S. Rock Mechanics/Geomechanics Symposium, 23-26 June, New York City, New York
- Publication Date
- Document Type
- Conference Paper
- 2019. American Rock Mechanics Association
- 2 in the last 30 days
- 19 since 2007
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ABSTRACT: Mining-induced seismic hazards continue to pose significant challenges for ground control at deep hard-rock underground mines. In the tradeoff between full production and absolute safety, the seismic hazards at deep mines can only be routinely assessed and then selectively mitigated, rather than predicted with full confidence or avoided completely. The improved ore-extraction rate and expansion of mine-wide developments at Alamos’ Young Davidson (YD) Mine in recent years have positioned the mine as a top gold producer of its kind in North America, along with increased seismic activity. This paper describes the proactive measures taken against seismic hazards that have been incorporated in the current YD Ground Control Management Plan. First, the use of seismic monitoring system and seismic analytical platform to identify seismic hazard zones is illustrated. Next, stress modeling as an indicative tool to further examine stope blasting-triggered seismic risk is discussed, and the assessment is enhanced by the use of 3D Velocity Model to closely monitor the rock mass fracturing process in the form of seismic clustering. Finally, an empirical approach specially developed for Canadian deep mines, coupled with site-specific field observations, is employed to justify the support design for large-span intersection developments with a focus on mitigating dynamic loading hazards.
Mining-induced seismic hazards continue to pose significant challenges for ground control management at deep hard-rock underground mines. The seismic hazards are mainly intensified with the increase of extraction rate, mining depth, or a mix of both. It is the authors’ view that the intensity of mining-induced seismic hazards in mining engineering, compared with seismic intensity in civil engineering, cannot be predicted but rather than estimated or assessed. Therefore, the adopted ground control management plan should be proactively suited for assessing and mitigating site-specific seismic hazards.
The Alamos's Young Davidson (YD) gold mine is located in the Kirkland Larder Lake Gold Belt, Ontario, Canada, intersected by the regional Larder Lake-Cadillac Fault Zone and hosted in a felsic intrusive syenite unit (Fig. 1). The Timiskaming metasediments are found to be predominantly the footwall rock type and are also found to be inter-bedded layers throughout the syenite rockmass. The hangingwall of the deposit is predominantly mafic volcanic. The gold mineralization is mostly related to quartz veinlet stockworks and disseminated pyrite mineralization, hosted in felsic intrusive syenite unit. The syenite hosts a number of mineralized gold zones. All lithologies are cut by late, generally northeast-trending Proterozoic diabase dikes.
|File Size||2 MB||Number of Pages||16|