9:00 AM - 9:25 AM
[3501-07-01] On The Return Airway Structure in The Okiriyama Tunnel in The Sado Gold and Silver Mine
○Hideki Kuma1, Haruki Morisaki1, Hisao Fukuoka2, Mika Aoki3 (1. Matsue National College of Technology, 2. Tokyo Denki University, 3. Kansai University Graduate School)