The Castle Hill Mineral Resource comprises four deposits from south to north: Wadi, Mick Adam, Outridge and Kiora.

The principal lithology to host gold mineralisation at Mick Adams-Kiora and Wadi (Castle Hill Stage 1) is the Kintore Tonalite a large intrusive granitoid of granodioritic composition. The tonalite intrudes a sequence of basaltic and ultramafic rocks to the east and west. The elliptical Kintore Tonalite attenuates to the south to form very long narrow (80m wide in plan) intrusion which hosts the Mick Adams and Wadi gold mineralisation and a dyke swarm to the south-east which hosts the Outridge and Kiora gold mineralisation. Gold mineralisation is also hosted along the eastern margin of the main body of the tonalite at Wookie and Picante. Gold mineralisation in this area is hosted within the tonalite and within the flanking mafic/ultramafic sequence. The Lady Alice gold mineralisation is associated with a fault array hosted entirely within the bulk of the tonalite intrusive. The Lady Alice fault array coincides with the boundary between de-magnetised tonalite to the east and magnetised tonalite to the west.

Vertical vein arrays and kinematic indicators at Mick Adams and Kiora show the primary deformation at Castle Hill was extension with an east block down (sinistral normal) sense of movement, suggesting emplacement of the tonalite coincided with the beginning of an extensional doming event and the start of basin formation.

Mick Adams and Wadi are separated by a NE trending fault which has generated an offset of 250m across strike. Both deposits dip shallowly to the east. NW trending shear zones which were re-activated during sinistral transpression accommodate much of the compressional strain and act to preserve the extensional domain. Primary mineralisation within the tonalite at Mick Adams and Wadi occurs as discrete narrow west dipping quartz veins containing moderately to extremely high gold grades and as fine disseminated gold within the tonalite groundmass. Visible gold has been observed in drill core in both quartz veins and as blebs in the tonalite groundmass. The disseminated gold is commonly associated with minor blebs of pyrite, arsenopyrite and rare chalcopyrite. High gold grade veins are typically 10 to 20cm thick and commonly occur in extensional arrays of four to five veins generating high grade zones up to 10m in horizontal thickness. Extensional veins are more common along the eastern margin of the tonalite. At the southern end of Mick Adams extensional vein arrays have been intersected in the footwall of the mafic unit proximal to the tonalite contact.

Extensional shear zone arrays are also the host of the gold mineralisation at Kiora. Sheeted quartz veins are interpreted as the extensional veins propagating out form the shears. The veins within Kiora are hosted within the tonalite along the contact with ultramafic rocks and have been interpreted as having undergone supergene enrichment. Gold mineralisation at Kiora is also hosted within fault fill veins formed March 2015 by movement on a shallowly dipping normal fault. Primary mineralisation within the basalt which forms the immediate hangingwall of the Mick Adams mineralisation is characteristically associated with shearing, extensional veining and biotite alteration. This mineralisation has been called Outridge and comprises a number of zones which pinch and swell along strike and down dip. Outridge mineralisation has been interpreted as steeply dipping to the west.

Mick Adams Mineral Resource has the imensions of 1290m (north) by 100m (east) and has been drilled to an average vertical depth of 275m. The Wadi Mineral resource has the dimensions of 580m (north) by 50m (east) and has been drilled to a depth of 150m.

Mining at Castle Hill will use a conventional drill and blast, truck and excavator open pit operation with 5-10m high blasting benches mined in two or four 2.5m flitches. The Castle Hill Ore Reserve estimate includes factors for ore loss and dilution. Waste material is classified as material below the marginal cut-off grade (0.50g/t Au) and will be transported to the waste storage facility. Mineralised waste between 0.50 and 0.85g/t gold is stockpiled separately and may be processed pending economic evaluation. Ore is classified as material greater than the marginal cutoff grade (0.85g/t Au) and will be taken to the ROM pad then hauled by road train to the Mungari plant for processing.

Mining dilution applied to ore mined on each bench is 15.0% at zero grade. This factor is higher than other deposits at Mungari (usually 5-10%) due to the small sub-block size in the geological model which will incur external dilution during mining.

Mining recovery of ore on each bench is applied as 99.0%, consistent with other deposits at Mungari based on actual performance at White Foil.

Castle Hill ore will be treated at Evolution’s fully owned Mungari Processing Plant which was commissioned in April 2014. Mungari is located 25km south-east of the Castle Hill project.

Castle Hill ore is conventional free-milling ore which is amenable to processing through a carbon-inleach (CIL) gold processing plant, such as Mungari.

Metal recovery for Castle Hill through Mungari is assumed to be 92.0%, which is slightly lower than actual performance at Mungari processing similar grades. Using the Mungari standard grade recovery- curve, the 1.4 g/t average grade at Castle Hill results in 92.8% recovery.

The slightly conservative recovery estimate is considered appropriate based on the metallurgical test work (results from 2013 Phoenix study) deemed equivalent to pre-feasibility study level for Castle Hill ore at Mungari. An additional test work program will be undertaken to understand ore variability and how to optimise Mungari for treating Castle Hill ore.