CHINA MINE ENGINEERING

To achieve safety and high efficiency, the high-level large diameter long hole stoping process is adopted in Ashele Copper Mine. After investigating the country rock conditions and the potential forms of roof falling, long anchor bolts were adopted for the roof support design. Field testing revealed two types of falls, which are from the middle to sideways, and from down upwards. The form of anchor bolt support and support parameters were then determined: anchor bolts are 10-12m long, row intervals are at 2m, drill hole diameter 2-3 times as long as the anchor bolt diameter. Field pilot tests showed such support not only provides good control of the roofs, but significantly boosts economic benefits as well.