Controlled Blasting for Safe and Efficient Mining Operations at Rampura Agucha Mine in India
Rampura Agucha open pit mine is a lead zinc mine producing 6 mtpa of ore and has started its underground part which is slated to produce 4.5 mtpa of ore in near future.The mine is,currently working at 300 m depth and is designed to reach to a depth of 421 m.The open-pit as well as underground operations are in full swing.This leads a greater emphasis as its footwall is achieving its final configuration while hang wall is on dynamic stage.During blasting,back break was the main concern as despite of carrying out pre-splitting; the benches experienced back breaks adversely affecting the stability.Normal production blast consists of firing 7~ 16 rows involving 150~450 holes in a blast round.A master plan of the presplit holes position at spacing of 1.2 m was prepared.The available explosive was in the cartridge diameter of 25 mm which provided decoupling by factor of 3.6.Every bench of footwall and of all stages of hang wall is pre-splitted to minimize damage to the rock mass.Pre-split holes of about 8 00 000 m are being drilled annually to make pit-wall stable.In the experimental trials the mouths of the pre-split holes were left without explosives from 1 to 2.7 m.In the latter stage the inclined holes of 80°,70° and 60° with 115 mm diameter were experimented.The pre-split at a spacing of 1.2 m and inclined at 60° on footwall and 70° on hang wall yielded desired results.
pre-split wall control damage to wall blast optimisation controlled blasting
Pradeep K Singh M.P.Roy Amalendu Sinha
CSIR-Central Institute of Mining & Fuel Research,Dhanbad,India
国际会议
The 4th Asian-Pacific Symposium on Blasting Techniques(第四届亚洲太平洋地区爆破技术研讨会)
深圳
英文
137-151
2014-11-01（万方平台首次上网日期，不代表论文的发表时间）