A worker waters the site of a rare earth metals mine at Nancheng county, Jiangxi province January 16, 2011. REUTERS/Stringer/File Photo Purchase Licensing Rights, opens new tabTAIPEI, Oct 12 (Reuters) - No significant impact is expected on Taiwan's semiconductor industry from China's new curbs on rare earths as they differ from the metals needed for the chip sector, the island's economy ministry said on Sunday.China dramatically expanded its rare earths export controls on Thursday, adding five n...