He never gives away how he knows..

9:09:07 AM 12 Mar 2016 _The__Doctor 5 diamond ores
9:08:42 AM 12 Mar 2016 _The__Doctor 2 diamond ores
9:08:20 AM 12 Mar 2016 _The__Doctor 4 redstone ores
9:07:13 AM 12 Mar 2016 _The__Doctor 6 diamond ores
9:06:44 AM 12 Mar 2016 _The__Doctor 21 iron ores
9:05:58 AM 12 Mar 2016 _The__Doctor 8 diamond ores
9:00:48 AM 12 Mar 2016 _The__Doctor 9 redstone ores
9:00:38 AM 12 Mar 2016 _The__Doctor 5 diamond ores
9:00:21 AM 12 Mar 2016 _The__Doctor 5 diamond ores
8:39:28 AM 12 Mar 2016 _The__Doctor 30 coal ores
8:39:18 AM 12 Mar 2016 _The__Doctor 7 iron ores
8:38:53 AM 12 Mar 2016 _The__Doctor 5 iron ores
8:38:04 AM 12 Mar 2016 _The__Doctor 4 coal ores
8:37:14 AM 12 Mar 2016 _The__Doctor 7 iron ores
8:37:01 AM 12 Mar 2016 _The__Doctor 8 iron ores
8:36:44 AM 12 Mar 2016 _The__Doctor 7 iron ores
8:31:50 AM 12 Mar 2016 _The__Doctor 31 coal ores
8:30:41 AM 12 Mar 2016 _The__Doctor 18 coal ores
8:19:25 AM 12 Mar 2016 _The__Doctor 5 gold ores
8:18:42 AM 12 Mar 2016 _The__Doctor 8 diamond ores
8:17:50 AM 12 Mar 2016 _The__Doctor 9 redstone ores
8:17:40 AM 12 Mar 2016 _The__Doctor 2 lapis ores
8:16:37 AM 12 Mar 2016 _The__Doctor 6 redstone ores
8:16:25 AM 12 Mar 2016 _The__Doctor 4 gold ores
8:16:11 AM 12 Mar 2016 _The__Doctor 4 gold ores