In the end, an economic analysis must be done considering not only the blasting cost, but the pull obtained and the mucking, crushing and secondary blasting
(or lost production from boulders) in a full mine-to-mill optimization.
Dealing with boulders by breaking them during the blast, and avoiding secondary blasting
, provides many advantages including reduced cost, increased production, longer throw of material and reduced equipment needs.
Tenders are invited for Secondary Blasting
/ Plaster Shooting In Boulder At Mahan Ocm Of Bhatgaon Area
The drop ball, used in the early 1900s, was abandoned with the development of pneumatic drilling tools, which permitted secondary blasting
of large boulders.
Using abrasive sand blasting or blasting with glass beads can slightly damage the surfaces of the cleaned objects, while producing secondary blasting
media waste that then must be disposed.
In secondary blasting
, explosive denotation release a huge amount of energy which results to rock shattering and scattering and consequently high fly rocks.
The labour cost for secondary blasting
can be expressed as a percentage of the labour cost for primary mucking.
of Kirkland Lake has developed a pre-assembled secondary blasting
charge which it claims saves time in placing charges and hooking up the blast.
Tenders are invited for Hiring Of Tractor Mounted Air Operated Drill Machine With Compressor For 366 Days From 01-02-2016 To 31-01-2017 For Secondary Blasting
Few problems (costs) with secondary blasting
and generally good floor conditions.
The actual issues related to poor fragmentation, the expert noted, aren't primarily associated with the crusher; they take the form of loading and haulage inefficiency, high secondary blasting
costs and accelerated equipment wear and failure, to name a few.
Frequently good fragmentation is described as that which produces rock fragments that are easy to dig and which will not require secondary blasting