[40] The Boxer Rebellion broke out shortly after the Hoovers arrived in China, trapping them and numerous other foreign nationals until a multi-national military force defeated Boxer forces in the Battle of Tientsin. Fearing the imminent collapse of the Chinese government, the director of the Chinese Engineering and Mining Company agreed to establish a new Sino-British venture with Bewick. After they established effective control over the new Chinese mining company, Hoover became the operating partner in late 1901.[41]
In this role, Hoover continually traveled the world on behalf of Bewick, visiting mines operated by the company on different continents. Beginning in December 1902, the company faced mounting legal and financial issues after one of the partners admitted to having fraudulently sold stock in a mine. More issues arose in 1904 after the British government formed two separate royal commissions to investigate Bewick's labor practices and financial dealings in Western Australia. After the company lost a lawsuit Hoover began looking for a way to get out of the partnership, and he sold his shares in mid-1908.[42]

Sole proprietor
Hoover in 1917 while a mining engineer
After leaving Bewick, Moreing, Hoover worked as a London-based independent mining consultant and financier. 