Background: The aim of this study was to assess the applicability of telemetric method in assessing heat stress of copper miners in a hot environment. Material and Methods: The studies were conducted in 15 mining machine operators (working without air condition) The evaluated parameters were skin temperature, core temperature, heart rate and respiration rate. Results: In every examined miner we have obtained about 340 results (registrations of evaluated parameters during work shift) and this allowed us to evaluate physiological work cost and to determinate thermal homeostasis disturbances. Conclusions: The telemetric method (VitalSense System) proved to be very useful in monitoring physiological parameters of miners working in a hot environment. Med Pr 2010;61(1):35-42