This is as clear as it gets, page-131

From the same announcement.

"In the 1980’s, Union Oil and JV partner Kakadu excavated a total of seven costeans (approximately 1000m) across the pegmatite zone. 203 channel samples were collected over intervals of 5m and analysed for Sn, Ta, Y, La, Ce, Nd, Tb and Th. Results indicate highly anomalous levels of tin, tantalum and rare earth metals (LCT Type Pegmatites). 31 rock chips were taken by Haddington in 2006, and results indicating highly anomalous, but “patchy” Sn, Ta and Li levels. The two best Ta results were returned from the very northern extremity of the rock chip sampling."

The surface is highly weathered, but we don't know what is a depth yet.