Otto Schumacher passed away on September 27, 2018 at age 76. He was a professional mining engineer and professional geologist based in Spokane, WA, USA. He held a Bachelor of Geological Engineering degree from the University of Minnesota and a Master of Science - Geology degree from the University of New Mexico. He worked as a mining engineer and geologist in underground mine operations for base and precious metals as well as on exploration projects for uranium and iron. He began specializing in mining cost and economic analysis upon joining the U.S. Bureau of Mines as Supervisor, Mining Feasibility Analysis Group, where he was responsible for development of aspects of Bureau systems for mine cost estimating and mineral property evaluation. In 1983, he started Western Mine Engineering, Inc., the predecessor to InfoMine's CostMine division, where he consulted and taught seminars in the area of mine evaluations, and also developed Mining Cost Service and related publications. He served as a Director and technical advisor to CostMine. He was a past president of the Columbia Section of SME and a past president of the Northwest Mining Association (now American Exploration and Mining Association).