** Shares of VRX Silica VRX.AX rise as much as 25% to A$0.11, marking their biggest intraday pct gain since September 2

** Stock hits highest since October 9

** Silica sand company secures four binding offtake contracts for the supply of silica sand from its Arrowsmith North silica sand project in Western Australia

** Contracts are for the supply of an aggregate minimum of 410,000 tonnes per annum of silica sand products to suppliers of foundry industries in South Korea, Taiwan, and a glass manufacturing supplier in the Philippines

** YTD, stock has more than doubled in value

(Reporting by Shruti Agarwal in Bengaluru)

((Shruti.Agarwal@thomsonreuters.com))