I tend to agree with Seth, Tunkillia is too far and doesn't have the grade. Probably can back calculate the cost estimated per ounce of haulage from Tarcoola (by looking at processing cost for Challenger ore) and then extrapolate to Tunkillia.
My feeling is that Tarcoola is A$50-100/oz but Tunkillia would be more like A$200/oz +. The fact that the company has not suggested that Challenger could be used for Tunkillia ore probably means they have run some basic numbers. Might be possible with a higher gold price (A$2,000).
WPG Price at posting:
8.4¢ Sentiment: Buy Disclosure: Held