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

- II – Critical – Other incidents (32),<br />
due to fatalities on conveyors<br />
- III – Marginal – Fire (41), Occurrence<br />
of other gases (15), occurrence<br />
of CO (13)<br />
Table 3.[8]<br />
Degree of<br />
probability<br />
- IV – Negligible – Penetrations (37)<br />
Table 3 can be combines on the basis<br />
of combination the given degrees of probability<br />
and severity as follows:<br />
Degree of severity<br />
IV III II I<br />
Negligible Marginal Critical Catastrophic<br />
I-A<br />
A-very<br />
unlikely<br />
B-unlikely I-B<br />
C-seldom 2xI-C<br />
D-occasional 2xIII-D<br />
E-likely IV-E II-E<br />
F-frequent III-F<br />
7. CRITERIA FOR DETERMINATION<br />
OF TOLERABLE RISK LEVEL IN<br />
THE STRATEGIC DECISION<br />
MAKING<br />
Risk assessment methodology should<br />
be selected based on weighing of its advantages<br />
and disadvantages. It is not easy<br />
to assess the risks in coal exploitation, due<br />
to all natural and man-made conditions.<br />
However, it should be rewarding since it<br />
enables to assess the effectiveness of<br />
measures implemented in order to reduce<br />
the risk of possible harmful incidents.<br />
Combination of t degrees represents the<br />
risk of the hazard in question. However,<br />
this method's disadvantage lies in its arbitrariness,<br />
since complete analysis depends<br />
on sometimes too subjective and arbitrary<br />
decisions of the analyst.[9]<br />
Another possible weakness of this<br />
method can be unreliability of the used<br />
data, considering the fact that, when it<br />
comes to mining, there are no rules in<br />
terms of continuity or periodicity of hazardous<br />
incidents.<br />
A number of methods can be used to<br />
combine the degree of probability and<br />
degree of severity. The simplest approach<br />
is to state the both values.<br />
Upon evaluation, each risk in the system<br />
need to be assessed so that its tolerability<br />
can be established and possible<br />
measures for its reduction adopted. Assessment<br />
of risk surpasses strictly technical<br />
frame, since there are also legal and<br />
ethical aspects to it. In this case, the aim is<br />
to reach the balance between the improvement<br />
gained at the end of the process,<br />
the investment into elimination of<br />
risks, the satisfaction of actors in the process,<br />
the conformity with developmental<br />
concepts and other factors in the overall<br />
system. In the context of the mining activity<br />
and especially underground mining,<br />
safety of direct actors, i.e. miners in the<br />
underground mining are the most important<br />
factor in all considerations.<br />
Two main guidelines that need to be<br />
observed in assessment of risk are:<br />
public has low risk tolerance, and resources<br />
for risk elimination are hard<br />
to find in the current economic environment,<br />
in the country and industry,<br />
tolerance of society for residual risk<br />
depends on the benefits that mines<br />
No 4, 2011. 126<br />
MINING ENGINEERING