At present, the mainstream transaction prices of ferro silicon 10-50mm 72# and 10-50mm 75# are RMB6300-6500/ton (US $939-969/ton) and RMB6400-6600/ton (US$954-984/ton) which compared with last week increased RMB100/ton (US$14.9/ton). In view of the continuous tight supply, the industry insiders believe that the price of ferro silicon will continue to rise in the next two weeks.