Using a 19% phosphorus pentoxide cutoff, Centrex Metals Ltd. defined a total resource of 14.2 million tonnes at 28.7% phosphorus pentoxide at its Ardmore phosphate rock project in Queensland, Australia.
This includes a measured resource of 1.3 million tonnes at 29.7% phosphorus pentoxide, or P2O5, an indicated resource of 11 million tonnes at 29% P2O5 and an inferred resource of 2 million tonnes at 26.3% P2O5.
In comparison, the maiden resource estimate for Ardmore included an inferred resource of 12 million tonnes at 28.7% P2O5.
The updated resource was based on a recently completed 319-hole reverse circulation drilling program plus data from 303 historical drill holes.
Centrex will now update mine designs based on the new estimate for the project's scoping study.
The company, meanwhile, said the process plant design for the scoping study will be based on bench scale test work that involves crushing, attritioning and desliming the ore to produce a premium 35% P2O5 concentrate with ultra-low cadmium levels.
