Since their acceptance in mining, G.L.Tiley & Associates Ltd. has been a pioneer in the use of PLC control systems for mine hoist applications, providing advanced control for manual, shaft-sinking, and automated operation of both production and service hoists, loading pocket and material handling systems. Troubleshooting and reliability are far beyond the alternatives, and the use of readily available off-the-shelf PLC components ensures a long product life. At present, we are using both Modicon and Allen-Bradley PLC systems to provide the highest levels of functionality and control sophistication.