With sublevel caving
, blast holes are drilled up from below into the ore body.
This mineralized zone extends to over 100 meters in length, 40 meters in width and 70 meters in height (see Fig 9.- Schematic View of the Sublevel Caving
Traditional mining methods for hanging-wall ore-body include surface mining and back-fill stoping method such as that in the Fenghuangshan Iron Mine of China and the Kidd Creek Zinc-copper Mine of Canada, the sublevel caving
method such as that in the Yeshan Iron Mine and the Longshou Mine of China, and the sublevel open stoping and caving mining method such as that used by Liu et al.
Lan, "Numerical simulation of land subsidence and verification of its character for an iron mine using sublevel caving
," International Journal of Mining Science and Technology, vol.
In recent years, in China, technology of fully mechanized sublevel caving
mining is extensively used; besides, gas extraction technique has been widely promoted in the gas treatment.
- Highly regarded JKTech Pty Ltd have been engaged "to provide a high level study to evaluate the Mount Adrah orebody caveability and assess the potential for block or sublevel caving
methods based on geological and geotechnical criteria".
The sublevel caving
mining system is used for steep, continuous mineral deposits.
Selection of preferred mining methods tended towards non-entry methods such as block caving and sublevel caving
, allowing high levels of automation, control and monitoring, thereby minimising the number of people required to work in potentially hazardous conditions.
Bull and Chris Page  provide an excellent summary of sublevel caving
. They note that "in many cases, classical SLC layouts influenced by early theories obtained relatively poor results.
In 2023, the crown pillar will be blasted, and mining will transition to sublevel caving
for the remainder of the mine life at an estimated average mining rate of 4,700 mt/d.
The extrathick coal seam by sublevel caving
with more than 3.5 m bottom cutting height has obvious technical advantages, such as increased cutting height, optimized caving ratio, increased caving by mining pressure, increased ventilation section of working face, and reduced ventilation resistance.
However, in order to increase mining capacity and reduce production costs, decision has been made to change this system to sublevel caving