nder heavy fire. Hoover himself guided US Marines around Tianjin during the battle, using his extensive knowledge of the local terrain.[10]
Hoover was made a partner in Bewick, Moreing & Co. in 1901 and assumed responsibility for various Australian operations. In August–September 1905, Hoover came up with a technological innovation. When visiting the mines at Broken Hill, New South Wales, he noticed considerable zinc in the Broken Hill lead-silver ore, which could not be recovered and was lost as tailings. Hoover devised a practical and profitable method to use the then-new froth flotation process to treat these tailings and recover the zinc.[11] With William Baillieu and others, he founded the Zinc Corporation (later, following various mergers, a part of Rio Tinto Group).
In 1908, he became an independent mining consultant, traveling worldwide until the outbreak of World War I in 1914. His lectures at Columbia and Stanford universities were published in 1909 as Principles of Mining,[12] which became a standard textbook. Hoover and his wife also published their English translation of the 1556 mining classic De re metallica in 1912. This translation from the Latin of Renaissance author Georgius Agricola is still the most important scholarly version and provides its historical context.[13] It is still in print.
[edit]Humanitarian
When World War I began in August 1914, he help
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Airport transportation
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