Sundance Resources has requested its shares be placed in a trading halt pending an update on the proposed take-over by Hanlong Mining Group.

The company said, in a letter to the Australian Securities Exchange, the announcement would be made to the market prior to the open of trading on Tuesday, November 29, 2011, or earlier.

The $1.3 billion scheme of arrangement take-over offer was made in July this year.

The Australian Securities and Investment Commission (ASIC) is conducting insider trading investigations of three Hanlong executives.