Houston-based Castleton Resources said that its subsidiary Castleton Commodities International LLC (CCI) has closed on the acquisition of the East Texas and North Louisiana Haynesville Shale assets of BG US Production Company LLC, a subsidiary of Royal Dutch Shell plc. Pro forma for the acquisition, Castleton Resources will hold approximately 222,400 net acres in the region and produce approximately 334 MMcfe/d (net). Castleton Resources is owned by CCI and Tokyo Gas America Ltd., a wholly owned subsidiary of Tokyo Gas Co., Ltd. Concurrent with the transaction, Tokyo Gas America Ltd. will increase its interest in Castleton Resources from 30% to approximately 46%.