The performance of mining sectors can be influenced by many factors. Technology outside mining industry, which mainly refers to the innovations from the downstream consumer side along the raw material supply chain, is one of the significant determinants. Historically, there has been abundant research on the technological inventions to improve the individual mineral production, however, there are only a very few documents investigating how the innovation outside of the mining industry affects the markets of mineral commodities and, consequently, the miners' responses. This thesis aims to investigate the corporate strategies that the mining companies adopted to cope with the downstream innovation. In this book, the markets of gallium, germanium, indium and tantalum from 1996 to 2007 are provided, and the business events and activities reported about the corporate decisions and changes of Ga, Ge, In and Ta producing companies during the same period are surveyed and analyzed.