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CONTENTS

Page

LIST OF DESIGNATIONS................................................... 9

1.    INTRODUCTION........................................................ 15

1.1.    Safety and hazard.............................................. 15

1.2.    Respirable and explosive dust.................................. 16

2.    SUBJECT, AIM AND THESIS OF WORK..................................... 19

3.    ELEMENTS OF THE THEORY OF EVENTS.................................... 21

3. 1. Events......................................................... 21

3.2.    Necessary and sufficient condition of the seąuence of events... 25

3.3.    Necessary Chain of events preceding the effect................. 31

4.    GENESIS OF UNDESIRABLE EFFECTS AND THE SRUCTURE OF THE AIMS IN THE

COLLIERY............................................................ 36

4.1.    The no-hazard phase............................................ 40

4.2.    The conventional hazard phase.................................. 44

4.2.1.    The    accident hazard..................................... 44

4.2.2.    The    health hazard....................................... 46

4.3.    The full-hazard phase.......................................... 49

4.3.1.    The    accident hazard..................................... 49

4.3.2.    The    health hazard....................................... 53

4.4.    Comparison    of the accident and health hazard................... 54

5.    THE NECESSARY CHAINS OF EVENTS PRECEDING ACCIDENTS AND MINING

DESEASES............................................................ 58

5.1.    Retrospective analysis of seąuence of events preceding an

accident....................................................... 61

5.2.    Retrospective analysis of seąuence of events preceding a mining

disease........................................................ 71

5.3.    Necessary chains of events preceding the harmfulness........... 76

6.    GENERALIZATION OF THE CONCEPTS OF HAZARD AND SAFETY................. 79