http://www.nt.gov.au/dpifm/Minerals_Energy/Geoscience/index.cfm?n...

http://www.nt.gov.au/dpifm/Minerals_Energy/Geoscience/index.cfm?newscat1=Mineral%20Commodities&newscat2=Phosphate&header=Phosphate..........................................................................................Phosphate
The Northern Territory contains a variety of small to large undeveloped phosphate deposits. These deposits form a combined estimated resource of 35 Mt of phosphate (P2O5) product. Known phosphate deposits are present in the Georgina Basin, Arunta Region and Pine Creek Orogen. Deposits in the Georgina Basin account for 98% of identified resources.
Phosphate mineralisation is present in a number of deposit styles including; sedimentary phosphorite, hydrothermal veins and tectonic breccias. Large sedimentary phosphorite deposits (eg Wonarah) in the central Georgina Basin are middle Cambrian (510 Ma) in age. These are within a regional phosphate-rich stratigraphic interval that extends over 500 000 km2 in the NT and into western Queensland where mining of phosphate has been undertaken at the Duchess deposit.

Shallow-marine middle Cambrian clastic and carbonate units in the Wiso and Daly basins adjacent to basement highs represent attractive exploration targets for sedimentary phosphorite deposits. NTGS is currently conducting a Regional phosphate prospectivity assessment project that involves qualitative phosphate testing of samples from over 400 waterbores, drilled in prospective Middle Cambrian sedimentary rocks near existing transport infrastructure.

Sedimentary phosphorite mineralisation is also present in the McArthur Basin (Karns Dolomite), Amadeus Basin (Stairway Sandstone) and Money Shoal Basin (Moonkinu Formation). Phosphate-rich tectonic-related breccias are present in the vicinity of Batchelor (Buckshee Breccia) and South Alligator Valley (Scinto Breccia) within the Pine Creek Orogen. Small deposits (eg Geolsec) have been outlined at the former locality.

Apatite-rich veins and apatite-bearing igneous rocks (eg carbonatite) are present in the eastern Arunta Region. These relatively small deposits often carry high levels of Rare earth elements (REE). The most significant of these is the Nolans Bore deposit, which contains 4%