Ore passes are also required, at strategically locations along sublevels, for LHD-loaders to dump ore from sublevels, to be collected and transported on the haulage level below. Each sublevel features systematic layout with parallel drifts, along or across the orebody.
Generally, eight holes, inclined 80 to 85 degrees toward the slot, are drilled. Sublevel caving is in many respects simple. Using this method, mining is planned to extract rock from the stopes without filling the voids; SME, New York,p.
Blasting on each sublevel starts at the hanging wall, mining then retreats toward the footwall. Over the past few years, the scale of sublevel caving has increased markedly with LKAB being a leader in this regard.
The increased sublevel interval requires diligence in drilling, loading and blasting practices. Blasting is performed against broken waste rock as wall rock caves. Mining now proceeds underground, underneath the open pit. Blasting is done every night. From their control rooms, the operators drillers operate several drill rigs out in the production areas via remote control.
Loading continues until the operator decides that waste dilution is too high, and stops the mucking, and transfers to a nearby drift heading with a fresh cave. About 14 Mt of crude ore is extracted from the orebodies each year.
The result is a relatively high and uniform specific charge compared to the other holes in the round. Ore passes are also required, at strategically locations along sublevels, for LHD-loaders to dump ore from sublevels, to be collected and transported on the haulage level below.
The advent of improved drilling technology has made increased sublevel intervals possible in the sublevel cave mine. These holes are then charged with explosives and blasted. Once a level is extracted, the development openings are consumed.
Apart, blasting pattern used has also plays very important role. Generally, sublevel caving method employs use of fan drilling using long and smalldiameter holes, between sublevels or drill drifts to undercut and blast the ore-zone.
Hole diameter average 51 mm, Burden and Spacing vary from 1.
There are 10 drill holes in each series. Any small change in recovery in a sublevel caving layout can have a significant impact on revenue. The wall caving is induced by mining the ore in controlled sequence, usually from hanging wall to footwall and from top to bottom.
Possibly the modern version of the method was developed in the iron mines of Sweden. Sound engineering is indispensable to its conduct. The mining has been continuously improved and further developed to suit the difficult It can be used in orebodies with very different properties and it is easy to mechanize.Sublevel caving is a relatively safe mining method since the operations take place in small areas at a time and are highly mechanized.
The uniformly distributed nature of generally 5mxm sublevel nature of drifts aids in the safety of this mining method. Sublevel caving techniqueSimplicity and low cost are the essence SUBLEVEL CAVING TECHNIQUE SIMPLICITY AND LOW COST ARE THE ESSENCE Author: Partha Das Sharma, B. Tech(Hons.) in Mining Engineering, E.
We will write a custom essay sample on Sub Level Caving specifically for you. Sublevel Caving is one of the most advanced mining methods.
The model (Figure 2) below Sublevel Caving Technique: Simplicity and Low Cost are the Essence. Sublevel caving techniqueSimplicity and low cost are the essence SUBLEVEL CAVING TECHNIQUE R, "Subleve l Caving", Underground Mining Methods Handbook sublevel caving underground mining Resolute Planning Sublevel Cave for Syama Underground.
View source for Sublevel caving.
From QueensMineDesignWiki ← Sublevel caving. Jump to: navigation, search.
You do not have permission to edit this page, for the following reason: The action you have requested is limited to users in one of the groups: Users, approved. Sublevel caving techniqueSimplicity and low cost are the essence SUBLEVEL CAVING TECHNIQUE SIMPLICITY AND LOW COST ARE THE ESSENCE Author Partha Das Sharma B Tech Hons in Mining Engineering E mail sharmapd1 gmail com Blog Read more.
SECTION 10 SHRINKAGE METHODS Mike Turner Australian Mining.Download