Yunnan Chihong Zinc & Germanium (600497.SH) saw a 69% year-on-year slump in net profits to US$29.32 million (RMB200 million) on US$376.74 million (RMB2.57 billion) in revenues, down 11% year-on-year, in the first half of the year, the Securities Times reported. Its earnings per share were just RMB0.2627. A 1.62% year-on-year decline in zinc and iron production to 123,400 tons were cited for the poor performance. The metals represent 90% of Chihong's operating income. Sulfuric acid emerged as its most lucrative product, yielding a 66% profit margin.