Robert C. Lesser is a Consulting Engineer who retired from full-time engineering in 1989. This book is the result of over thirty-five years of experience gained in various key engineering positions, mainly with international engineering, process, manufacturing, and mining companies. He had contract administration responsibilities covering a wide range of major engineering projects, as well as feasibility and cost studies, and proposal preparation. He also held senior supervisory positions for the design, construction, commissioning, start-up and operation of thermal power, petroleum, petrochemical, mineral processing, and mining complexes.