1. INTRODUCTION . . 15

2. CARBON DIOXIDE AND THE ROCK MASSIF . . 17 
2.1 Natural emissions of carbon dioxide in Bohemian Massif . . 17
2.2 The water - carbon dioxide phase diagram . . 19 
2.3 The H2O-NaCl-CO2 system under the natural conditions of coal deposits . . 21
2.4 Sudden liberation of carbon dioxide and methane from the rock massif or from coal seams . . 23
2.5 Factors influencing CO2 and CH4 adsorption on bituminous coal under laboratory conditions . . 23
2.6 Nitrogen permeability of rock and coal under triaxial stress . . 29

3. CARBON DIOXIDE IN CENTRAL BOHEMIAN CARBONIFEROUS (SLANY COAL DEPOSIT) . . 33
3.1 Geology, hydrogeology and gas occurrence . . 33
3.3 Physical properties of rocks . . 42
3.4 Sinking of Slany Mine shafts and the adoption and effectiveness of certain technical 
    measures taken . . 51
3.5 Carbon dioxide outbursts experienced during the sinking of Slany Mine shafts 
    and the manifestations thereof . . 62
3.6 Summary . . 67

4. ACCUMULATION OF CARBON DIOXIDE IN BURIED WEATHERED COVER OF CRYSTALLINE BASEMENT AND IN BASAL 
   SEQUENCES OF COVERING STRATA (MOST BASIN, NORTH BOHEMIA) . . 69
4.1 Carbon dioxide occurence in Most basin groundwaters within the Krusne hory 
    (Ore Mts) piedmont basin . . 69
4.2 The case of CO2 liberation during the sinking of the Komorany drainage shaft . . 70
4.3 The rock massif and the properties of the rocks therein . . 72
4.4 Gas conditions in Komorany drainage shaft and in boreholes KO-16 and V2A . . 84
4.5 Summary . . 86

5. CARBON DIOXIDE AND METHANE IN THE CZECH AND POLISH PART OF INTRA - SUDETEN BASIN . . 87
5.1 Geology, hydrogeology and gas occurrences . . 87 
5.2 The Czech part of Intra - Sudeten basin . . 88
5.3 Polish part of the Intra - Sudeten basin . . 96
5.4 Summary . . 99

6. CARBON DIOXIDE IN THE CZECH PART OF THE UPPER SILESIAN BASIN . . 101
6.1 Carbon dioxide in basal elastics of Lower Badenian sediments . . 101
6.2 Coal and gas outbursts in mines in the western part of Ostrava-Karvina Coal District . . 104
6.3 Carbon dioxide in zones of disturbed tectonics in the Carboniferous massif . . 106
6.4 Carbon dioxide in mine air and mine gas ascending to surface . . 106
6.5 Water and gas reservoirs in weathered crust of the Carboniferous . . 108
6.6 Summary . . 115

7. INFLUENCE OF CARBON DIOXIDE ON CORROSION OF CONCRETE STRUCTURES IN MINES 
   AND UNDERGROUND CONSTRUCTIONS . . 116
7.1 Model of concrete corrosion . . 116
7.2 Summary . . 118

8. CONCLUSIONS . . 119

PLATES 
PLATE A . . 122
PLATE B . . 124
PLATE C . . 128
PLATE D . . 132
PLATE E . . 138
PLATE F . . 142

REFERENCES . . 145