The 6.8-magnitude earthquake in China’s drought-hit Sichuan province, one of the country’s top resource suppliers, has had limited impact across the key commodities produced there, including natural gas, hydro power, lithium, aluminum and silicon, information collected by S&P Global Commodity Insights showed. The earthquake hit Luding County in Sichan province at 12:52 pm Sept. 5, with the epicenter 226 km…