The Federal Coal Mine Health and Safety Act of 1969 established maximum airborne respirable dust exposure levels for underground coal mines. In an effort to provide the knowledge needed to achieve compliance without reducing productivity, the Bureau of Mines has sponsored research oriented toward improving mining machines. This work has consistently shown that a deep-cutting, low-rpm (revolutions per minute) continuous miner can reduce respirable dust levels without production penalties. To provide the design data by manufacturers to produce versions of the deep-cutting machine, a prototype miner was instrumented and in-mine tests were conducted. The data acquisition system developed for this testing allowed real- time monitoring of selected machine parameters to include cutterhead bit forces, power levels, structural loads, and pressures. During the in-mine tests, these parameters were recorded for a wide range of operating conditions. Test variables were advance rate, bit lacing, and head rotary speed. Analysis of the test data was performed to quantify the characteristics in terms useful to the designers of continuous mining equipment. Peak, average, and root- mean-square values for power, torque, rpm, boom loads, and bit loads were computed.