Core Mining have a great resource that is near Sundance tenements - but no way of transporting to port.
Sundance have advanced plans for a railway giving them 'first mover' status. Core and Sundance recently signed an MOU agreeing to cooperate on discussions around Core accessing Sundance's rail line.
See http://asx.com.au/asxpdf/20120302/pdf/424ryfmncyvm2f.pdf
Perhaps more significant is that Glencore/Xstrata has a stake in Core and could potentially move to takeover both Sundance and the Avima tenements (my speculation only).
See http://www.coremining.com/index.php?option=com_content&view=article&id=19:glencore-invests-in-core-mining&catid=5:news&Itemid=7
SDL Price at posting:
45.0¢ Sentiment: Buy Disclosure: Held