4.1. INTRODUCTION4.2. MINE SYSTEMS4.2.1. General
principles4.2.2. Location of main fans4.2.3. Infrastructure of main
ventilation routes
4.3. DISTRICT SYSTEMS4.3.1. Basics of district system
design4.3.2. Stratified deposits4.3.3. Orebody deposits
4.4. AUXILIARY SYSTEMS4.4.1. Line brattices and duct
systems4.4.2. Forcing, exhausting, and overlap systems4.4.3. Air
movers
4.5. CONTROLLED PARTIAL RECIRCULATION4.5.1. Background and
principles of controlled partial recirculation4.5.2. Controlled
recirculation in headings4.5.3. District systems
4.6. UNDERGROUND REPOSITORIES4.6.1. Types of repository4.6.2.
Ventilation circuits in repositories for nuclear waste4.6.3.
Additional safety features
