What is sublevel open stoping?
Sublevel stoping is a mining method in which ore is blasted from different levels of elevation but is removed from one level at the bottom of the mine. Before mining begins, an ore pass is usually drilled from a lower to a higher elevation.
What is open stoping mining method?
Stoping is the process of extracting the desired ore or other mineral from an underground mine, leaving behind an open space known as a stope. Stoping is used when the country rock is sufficiently strong not to collapse into the stope, although in most cases artificial support is also provided.
What is sublevel caving mining method?
Sublevel caving (SLC) is a mass mining method in which the ore is drilled and blasted while the waste rock caves and fills the space created by the extraction of ore (Cokayne 1982. 1982.
What is longwall retreating?
A system of longwall working in which the developing headings are driven narrow to the boundary or limit line and then the coal seam is extracted by longwall faces retreating toward the shaft.
Is sublevel stoping practical in ore bodies?
Sublevel stoping is practical to apply in ore bodies which have competent hanging and foot wall rock. Furthermore the ore has to be in a stable situation. Lowest rate of essential compressive strength of the rock walls to apply sublevel stoping is 55 MPa normally.
How to position a drill in a stope?
Should open a horizontal slot for positioning the drill. This is done by extending the drift of the sublevel across the width of the stope. Moderate cost of mining (relat = 0.4.) A verage recovery (75%); Moderate dilution (up to 20%).
What is the maximum dimension to apply to the stope?
Configuration of stopes maximum 5.5 wise dimension to be applied to the stope. Configuration of stopes Configuration of stopes stable. Example: lower your volume or leave pillars inside the stope
Do large stopes generally dilution?
Larger stopes generally dilution. empirical approach called “stability graph method.” relating to the ceiling or side wall of the excavation. W.A.Hustrulid & R.Bullock; Chapter 60, p. 513- 520.