Research On Selecting The Most Suitable Extraction Method For Achin Talc-Magnesite Mine In Nangarhar Province, Afghanistan

Abstract

Abstract:
Magnesite is a natural material that has various uses in today's industry, but in the Achin
Talc-magnesite mine, only Talc has been mined by underground mining method. And the
magnesite has remained intact. However, the magnesite veins are located near the Talc veins,
and their thickness is 20-70 meters, which is considered to be completely suitable to be
extracted by open-pit mining method.
Global practice data shows that currently 83% of the world's mines are extracted by the
open-pit mining method. And about 17% of mines are extracted by underground mining
methods.Independently extraction of Talc by underground mining method raises the total
mining cost, and it also makes the extraction of the magnesite deposit impossible or difficult
in the future.
To select appropriate method for the simultaneous extraction of Talc and magnesite, the
average stripping ratio was obtained by the computational method. The average stripping
ratio achieved is (K=2.39). Comparing it with global norms, and considering the position of
mineral veins, open-pit mining method is proposed for this mine. This makes it possible to
extract both Talc and Magnesite with a very lower cost.
Independently extraction of Talc by underground mining method has created underground
voids next to the magnesite vein. Which will cause the magnesite vein to slide into these voids
in the future and now It causes the price of extraction per ton of Talc to rise.