On 22 Apr 2020, the air intake shaft at Shaling Gold Mine reached the depth of 1000 meters. As the depth of auxiliary shaft exceeded 1000 meters on 29 Feb 2020, it means both shafts constructed by JCHX have exceeded the depth of 1000m within one year, breaking the sinking record in China.
Located in Laizhou, Shandong, Shaling Gold Mine is designed with a capacity of 11,000t/d. Air intake shaft is designed with net diameter of 6.5m and a depth of 1,349m, while that of auxiliary shaft is 8.2m and 1,559m.
On 9 May 2019, the construction of two shafts was commenced. Shaft sinking experts and experienced engineers were dispatched immediately to support and provide guidance. Chairman Wang Xiancheng and President Li Zhanmin paid several visits to sites to ensure successful execution of works.
With joint efforts from management team and all crews on site, multiple challenges were overcame such as broken ground and seepage water, sinking progress was on schedule by strict process control and smooth shifting between different operations. In Sept 2019, monthly sinking rate of air intake shaft achieved 153.6m, while in Nov that of auxiliary shaft achieved 129.6m (8611m³), reached record-high on site.
In April 2020, monthly sinking rate for air intake shaft and auxiliary shaft respectively achieved 143.1m and 109.71m. On 29 Feb 2020, auxiliary shaft first exceeded the depth of 1000m, while breaking four records, being the largest diameter shaft, biggest monthly excavation volume, highest average sinking rate, and first shaft over 1000m.
As a scientific research project on ultra-deep shaft for National 13th Five-Year Plan, Shaling Gold Mine was challenged by a limited construction schedule and technical difficulties. Large sinking equipment are procured to ensure the timely completion of works, such as V, VI-type headgear, 4m winder, 7m³ bucket, and 4.8m high shutter.
JCHX fully utilized its expertise and experiences in sinking deep and large shafts, successfully sunk through aquifer by controlling seepage with grouting and broke sinking records for serval times.
