Rudarski radovi br 4 2011 - Institut za rudarstvo i metalurgiju Bor

this stage is carried out alternately by blasting<br />
the sides and ceiling with a fan of deep<br />
blast holes, with one or more separated (partial)<br />
charging. After blasting of each fan, the<br />
separately ventilation of the site is done, the<br />
protective "door" are installed and then<br />
loading of coal on a face conveyor and coal<br />
transport from stope. Coal pouring from<br />
stope is carried out gradually with a continuous<br />
sub-stowing of old work. In this<br />
way, a continuous pouring of coal is established<br />
from blasted fan and retained part of<br />
previous fans.<br />
Obtaining of coal above the junction of<br />
the base and excavation preparation is<br />
carried out in the third stage of<br />
excavation, which represents the final<br />
3. CALCULATION METHODOLOGY<br />
OF PILLAR STOPE CAPACITY<br />
Studying the parameters of pillar stopes<br />
basically starts from the most important<br />
parameter, the thickness of coal seams<br />
which are mined, since this parameter depends<br />
on the parameters of stope capacity<br />
and stope effects, and thus the economic<br />
parameters are connected.<br />
Fig. 1. Layout of the site on one excavation base<br />
phase of a mining excavation preparation<br />
(exploitation sites). Ventilation of the excavation<br />
preparations is done separately<br />
with the tube fans, located in the branches<br />
of fresh air flow.<br />
Transport of coal by this method is<br />
mechanized, and established bydoublechain<br />
face conveyors that are successively<br />
extended with the advancement of the site,<br />
or reduced in a stope drawing.<br />
In one excavation base, usually three<br />
sites are formed, with one still in progress,<br />
the second alternate in advancing and<br />
drawing and the third in drawing.<br />
The layout of the site on one excavation<br />
base for the application of this<br />
method of mining is shown in Figure 1.<br />
In the field of excavation, the height of<br />
production depends on the number of excavated<br />
units or the number of the excavated<br />
base on which the excavation works are<br />
carried out simultaneously.<br />
In calculation the capacity, it started<br />
from the assumption that the production is<br />
No 4, 2011. 75<br />
MINING ENGINEERING