The umbrella miner, a prototype continuous mining machine for simultaneous mining and bolting in a room-and-pillar coal mine, was designed and fabricated. This machine was tested on the surface at the Pittsburgh Research Center's mine equipment test facility during an 18-month period from September 1984 through February 1986. Surface testing of the umbrella miner first prototype unit showed the concept to have considerable potential for fulfilling the industry need for a mining machine that can simultaneously mine coal, bolt roof, and advance continuously from "break to break." However, a second-generation machine would have to be designed, fabricated, and tested before that potential could be realized. The first prototype umbrella miner, a highly experimental machine, experienced several major problems during surface testing. Chief among these were the inability to tram and maneuver dependably, the inconsistent operation of the hydraulically powered functions because of the complexity of the hydraulic system, and unreliability of the gathering head conveyor.