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Ventilation Considerations for the New Level Mine Project Access Tunnels

机译：新建矿山项目通道的通风注意事项

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This paper describes the ventilation analyses performed for the access tunnels at the New Level Mine project (NLMP) at Codelco's El Teniente operation outside of Rancagua, Chile. This new mine is anticipated to reach a final production of between 137 and 180 kt/d. Production from the NLMP is scheduled to start in the year 2017. The main access tunnels (MAT) are approximately 9 km in length, with one for personnel and supply access and the second one for ore extraction through a conveyor system. These two tunnels are a critical component of the initial stage 1 development and will be constructed independently of the existing mine workings. The tunnels were originally designed to be constructed with two tunnel boring machines. However, later analyses changed the construction approach to a conventional drill and blast technique. Because the design included two mid-tunnel ramp-to-surface connections, conventional mining methods would allow for development of the tunnels with multiple working faces to achieve a more rapid schedule. This paper presents the initial baseline considered for the ventilation design and the optimisation methodology applied by Codelco to minimise the airflow and pressure requirements of the ventilation system. Modifications to the design resulted in the addition of strategic airways and raises that could provide a saving of approximately 1 MW, when compared to the original design.
机译：本文介绍了Codelco位于智利Rancagua郊外的El Teniente矿场的New Level Mine项目（NLMP）对通道进行的通风分析。预计该新矿的最终产量将在137至180 kt / d之间。 NLMP的生产计划于2017年开始。主要通道（MAT）的长度约为9 km，其中一条用于人员和供应通道，第二条用于通过输送机系统进行矿石提取。这两条隧道是第一阶段开发的关键组成部分，将独立于现有矿山运营而建造。隧道最初设计为使用两台隧道掘进机建造。但是，后来的分析将施工方法更改为常规的钻孔和爆破技术。由于设计中包括两个隧道中间坡道到地面的连接，因此传统的采矿方法将允许开发具有多个工作面的隧道，从而实现更快的进度。本文介绍了通风设计的初始基线，以及Codelco为使通风系统的气流和压力需求最小化而应用的优化方法。与原始设计相比，对设计的修改导致增加了战略航道并提高了航线，可以节省大约1 MW。

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