The digitalization of the mining industry requires wireless connectivity for real-time status indications, remote-controlled mining operations, and autonomous driving vehicles in tunnels. This paper presents a wideband radio propagation measurement system and provides radio channel measurement results for data at 5G frequency range 1 and frequency range 2 bands recorded in Sandvik’s test mine in Tampere, Finland. The measured signal attenuation due to the blocking of the tunnel by a scoop and a large loader vehicle is found to be in the range of 10 dB at 3.5 GHz. The radio signal level attenuates significantly when the other end of the link moves into a side tunnel from the main tunnel. The measured signal attenuation rates in tunnel crossroads at 3.5 GHz were 10 and 15 dB/m. The root mean square delay spreads in the two crossroads were 3–10 ns, corresponding to coherence bandwidths of 300 and 100 MHz, respectively. The signal reflections from the tunnel walls were studied at a 26.5 GHz frequency by steering the transmission antenna azimuthally. The FR2 measurement results at 6 m inside the side tunnel indicate strong reflections from the side walls, evident from the path length amplitude results.