Abstract: The 29-4 orebody is the first mining body of new district construction of Laochang branch of Yunnan Tin Company Limited.Trackless equipment is firstly used to ore removal and the rail transportation method is adopted to exploit in sublevel caving with sill pillar.According to the application results,the good production effects is obtained.In addition,in view of the in insufficient of the production process,some valuable improvement measures are taken.

Key words: Trackless equipment, Sublevel caving with sill pillar, Bottom structure