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

e appropriate to use the term "spontaneous<br />
coal ignition" instead of "self-ignition<br />
of coal". Classifying hazards as natural<br />
can result in absence of measures to reduce<br />
probability of hazard occurrence, i.e.<br />
hazards which could be successfully reduced<br />
using the available and recognized<br />
methods of defense could be justified by<br />
"natural causes".<br />
4.1. CLASSIFICATION ACCORDING<br />
TO THE OCCURENCE<br />
MECHANISM<br />
4.1.1. Technological classification<br />
According to this criterion, the hazards<br />
are classified depending on phases of<br />
technological process in which they occur<br />
or on which they influence:<br />
1. hazards during development of deposits<br />
and preparation of rooms,<br />
2. hazards during excavation of coal,<br />
3. hazards during transportation of<br />
coal,<br />
4. hazards during the process of<br />
preparation, treatment or dressing<br />
of coal,<br />
5. hazards during the process of delivery<br />
of treated material,<br />
6. hazards during the process of electricity<br />
supply,<br />
7. hazards during the process of<br />
drainage or water supply.<br />
8. hazards during the process of functioning<br />
of ventilation system with<br />
all determinants.<br />
4.1.2. Classification according to<br />
severity<br />
1. Low-consequence hazards – low<br />
probability of occurrence of significant<br />
property damage or injury.<br />
Property damage is minor and the<br />
effects can be remedied using the<br />
company's internal resources, in the<br />
frame of regular working duties.<br />
2. Medium-consequence hazards –<br />
probability of occurrence of major<br />
property damage, mild or medium<br />
injuries and production stoppages<br />
that require external intervention,<br />
in order to re-establish production.<br />
3. High-consequence hazards – probability<br />
of occurrence of major<br />
property damage, serious injuries<br />
or fatalities and stoppages in production<br />
requiring reinvestment in<br />
order to remedy the effects.<br />
4.1.3. Classification of risks adopted<br />
in this paper<br />
This paper adopts a slightly adapted<br />
theoretical classification. Thus, the risks<br />
which can occur in the underground exploitation<br />
can be:<br />
- natural risks, and<br />
- anthropogenic risks occurring as the<br />
result of influence of man – workplace<br />
– equipment.<br />
This classification is empirical and of<br />
limited applicability; it is based on theoretical<br />
classification and supplemented by<br />
two inseparable factors (workplace and<br />
equipment), which significantly influence<br />
the complex working environment in<br />
theunderground mining.<br />
No 4, 2011. 122<br />
MINING ENGINEERING