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How often has "Ore!" been shouted excitedly as prospectors and miners discovered the treasures of the earth? But what is "ore?" This presentation will answer that question and review the iron ores of Pennsylvania, with special emphasis on Cornwall ore and iron ores from nearby Berks County. The presentation is the third part of a four-part series on the materials consumed in cold-blast, charcoal iron furnaces, and the principal waste product - charcoal, iron ore, limestone, and slag. The presenter will be Michael Weber, who volunteers as a guide, researcher, and lecturer at Cornwall Iron Furnace. As a 1982 geosciences graduate from Penn State, Mike worked for 36 years as a geologist, health physicist, and manager for the U.S. Nuclear Regulatory Commission and the U.S. Geological Survey. After retiring from Federal service, he returned to Cornwall Furnace, where he serves as a guide and researches the history of mining and the geology at Cornwall and similar deposits in PA.