Resource Base Limited announce a major milestone through delivery of a maiden Mineral Resource estimate at EL007647, part of the Company's Mitre Hill REE Project. The maiden JORC Inferred Mineral Resource estimate of 21 Mt @ 767 ppm TREO consists of thick zones of near-surface mineralisation. Significantly, the existing resource has the potential to substantially grow in size and scale as the Mineral Resource estimate only incorporates 38-62% of the identified Exploration Target drilled to date.

The Company has also completed significant aircore drilling in Exploration Lease EL 7646 located approximately six (6) km east of EL 7647 however is not included in this Mineral Resource Resource Base has estimated an Exploration Target at EL007647 of 13 Mt ­ 34 Mt at 630-830 ppm TREO. estimate. Following completion of the maiden Mineral Resource estimate, Resource Base is evaluating a follow-up aircore program to convert a portion of the Exploration Target to a JORC resource, and to test further extensions of REE mineralisation the Mitre Hill REE project.

In total 142 vertical air core holes for 2,052 m of drilling was completed to ascertain the Mineral Resource estimate. A cut-off grade of 325 ppm TREO-CeO2 was used for reporting purposes on a peer comparison of publicly available information and comparable clay-hosted mineralisation. Dominant drill hole spacing has been stated at 200m spacing with 400 m to 1,400 m between transects, which was considered appropriate for the JORC Inferred Mineral Resource Classification and Exploration Target as applied.

The ~2 kg samples for geochemical analysis were collected and assayed by Bureau Veritas laboratory in Adelaide, South Australia. Intervals were at 1m samples from each 1 m plastic bag. Near the end-of-hole narrower composite sample intervals, usually 3 m to 1 m depending on the depth of the reminder of the hole.

A representative sample was taken by spearing from each one metre bulk sample and depositing into calico. Field duplicates were taken for every metre sample. Additionally, a representative 1 m calico sample was also speared from each bulk sample bag and kept as master sample.

Sample lengths were determined by geological boundaries with a maximum sample length of 1 m. Bureau Veritas analysed, weighed and prepared whole samples within the laboratory in Adelaide, South Australia. Each sample was identified and a sample of 3 kg or less underwent pulverising to achieve better than 85% passing 75 microns. Elements include Sc, Th, U, Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu; with elements analysed at ppm levels.

Sc was determined by Inductively Coupled Plasma (ICP) Optical Emission Spectrometry whilst all remaining elements have been Determined by Inductively Coupled Plasma (ICP) Mass Spectrometry. The Mineral Resource estimate was conducted using Datamine Studio RM. Inverse Distance Weighting `ID3' techniques were used to interpolate assay grade from the drill hole samples to interpolate index values and non- numeric sample identification into the block model.

Ordinary Kriging was also used to interpolate TREO grade into the block model to be used as a validation check against the inverse distance weighting technique. The model has a block size of 100 m (X) x 100 m (Y) x 1 m (Z) with sub-cell splitting of 6 x 6 to provide increased resolution of the undulating morphology of the deposit. A discretisation array of 2 x 2 x 1 was used for the parent cell grade interpolation.

Appropriate and industry standard search ellipses were used to search for data for the interpolation and suitable limitations on the number of samples and the impact of those samples was maintained. The search ellipse was equal in size both along and across strike as no dominant grade strike direction exists for the deposit. No assumptions were made during the resource estimation as to the recovery of by-products.

Further detailed characterisation and leach of ionic clay sample studies are required that may affect the marketability of the heavy mineral products. The Mineral Resource estimate and Exploration Target was controlled to an extent by the geological/mineralisation and basement surfaces. Grade cutting or capping was not used during the interpolation because of the regular nature of sample spacing and the minimal number of statistical outliers.

Statistical analysis of composited drill holes by domain was undertaken to compare against the un-composited data and showed a satisfactory relationship which concluded that grade cutting or capping was not required at this stage of exploration. Validation of grade interpolations were done visually in Datamine Studio RM software by loading model and drill hole files and annotating and colouring and using filtering to check for the appropriateness of interpolations. Statistical distributions were prepared for model zones from drill hole and model files to compare the effectiveness of the interpolations.

Along strike distributions of section line averages (swathe plots) for drill holes and models were also prepared for comparison purposes.