One of the genetic types of niobium tantalum deposit. Such deposits are only found in the Burockman deposit in western Australia.
Deposit in the bottom of the paleoproterozoic volcanic silicide and carbonatization coarse surface mass containing niobium tuff layer containing niobium, tantalum, zirconium tuff, by different proportion of pumice, quartz, debris, and given priority to with potassium feldspar and quartz to take off the vitrified trace of matrix.
The upper part of the ore body is a poor sodium silicate, which is rich in pumice, and the lower part is rich crystal ash flow tuff containing a large amount of sodium feldspar.
In 1984, 50 million tons of ore was preliminarised, the average grade Nb2O5 0.44%, Ta2O5 0.027%, Y2O3 0.124%, zro21.04%, hfo30.035%, BeO 0.08%, Ga 0.011%. In 1985, the drilling circle 1 km long, 70 metres thick stone of opencast mining capacity is 4.29 million tons, the mine beryllium reserves of 44000 tons, the useful minerals are mainly niobite, containing yttrium niobate, zircon and monazite and hydroxyl bertrandite, etc. Mineral particle size is small, much less than 10 microns. The hydrometallurgical effect is good.
