|5.188.211.35|5.188.211.35\cさん＆Sara|I sing in a choir http://xxxnx.fun/oldmandaddy/ oldmandaddy Koenig heads a USGS effort to determine the potential of Gold Rush-era rocks and ore to yield what he calls "metals of interest" including rare earth elements. It's not that industry needs large amounts of such elements he says. It's that the small amounts it needs "are absolutely critical." さんの一首