Issues Related to the Pilot Operation of Paste Filling System in Jingchuan's No.2 Mining District

The construction of the paste backfill system in Jingchuan's No.2 Mining District began in 1991. In August 1999 the pilot operation succeeded and passed technical appraisal by the National Bureau of Nonferrous Metals Industry and was commissioned ever since. This paper introduces the pilot operation of the system and discusses the problems found in the pilot operating process.