People/engineer, scientist

John M. Callow

John M. Callow (1867–1940), engineer, scientist, from United States. Linked to copper, gold.

Legacy

Born in Norfolk, he came to the United States in 1890 and originated pneumatic flotation for treating ores. The Callow flotation machine was widely used in the first decades of flotation. He held 18 patents and won the Douglas medal in 1926.1

Story cards

Sources

  1. 2024 Inductees from Mining's Past Mining Foundation of the Southwest

From the Prospector Trails mining history dataset: each fact links to the source it was checked against. Figures are as the source gives them, in the money of their day. Not investment advice.

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Cover photos from Wikimedia Commons: Haul trucks by Lechhabmed, CC BY-SA 4.0; Crushers by photosmith2011, Flickr, CC BY-SA 2.0; Ball mills and SAG mills by photosmith2011, Flickr, CC BY-SA 2.0.