Oct 12, 2006. /Lesprom Network/. A female paper recycling entrepreneur worth an estimated $3.4 billion has topped the latest list of mainland China's richest people, marking the first time a woman has been ranked as the wealthiest person, Irish Times reported. Zhang Yin "pole-vaulted" to the number one spot when Nine Dragons Paper, her company, was listed in Hong Kong in March, according to Hurun Report, which ranks the country's richest individuals. Ms. Zhang's listed company, of which she owns 72%, buys scrap paper from the US and then processes it in China for sale.