Helix Resources will spend up to $2 million in the December quarter on exploration of a largely unexplored part of the Tunkillia gold anomaly in South Australia's Gawler Craton and stands by its belief the prospect hosts a potentially world-class gold deposit.

Managing director Mr Rob Mosig said this week a "broad-brush" drilling program of the bulk of the central Tunkillia area was set to be completed by the end of December and would give the company a much clearer picture of the quality of the 25-square-kilometre Tunkillia prospect.