Castillo Copper Limited announced further forensic work on the Mt Oxide pillar resulted in the former holder of the Big One Deposit mining tenure (ML5481) being contacted and, subsequently, providing substantial historic information about WME & other groups' exploration activities undertaken during the life of the tenure. For the Boomerang Mine, historic production data was reported in a Geological Survey of Queensland report. Big One Deposit: up to 28.4% Cu from RC drill hole assay In 1993, WME completed a RC drilling campaign at the Big One Deposit, comprising 27 drill-holes (aggregating 1,673m2) which produced the following standout assayed intercept: B07 - 3m at 12.25% Cu from 42m incl: 2m at 17.87% Cu from 43m and 1m at 28.40% Cu from 44m Other notable intercepts from the campaign, clearly demonstrate the mineralisation is at shallow depth and a long a 600m strike zone (Figure 1 & Appendix B), including the following2: B02 - 2m at 1.45% Cu from 36m incl: 1m at 2.48% Cu from 37m B05 - 8m at 2.33% Cu from 44m incl: 6m at 3.00% Cu from 45m and 5m at 3.28% Cu from 45m B06 - 4m at 2.20% Cu from 44m incl: 2m at 3.19% Cu from 46m and 1m at 3.63% Cu from 47m B07 - 9m at 0.84% Cu from 32m incl: 3m at 1.69% Cu from 36m and 1m at 2.37% Cu from 36m B08 - 3m at 0.80% Cu from 48m incl: 1m at 1.18% Cu from 49m B25 - 6m at 1.55% Cu from 66m incl; 5m at 1.79% Cu from 66m and 2m at 2.08% Cu from 66m B26 - 3m at 1.36% Cu from 73m incl: 2m at 2.29% Cu from 73m and 1m at 1.02% Cu from 74m Under Queensland laws, any activity that takes place on a mining lease, such as drilling and mining, are not required to be reported to the regulator as `exploration records.' Consequently, only `exploration records' are released into public domain by the Queensland regulator. Hence, CCZ's geology team had to track down the previous holder of the Big One Deposit mining tenure to secure the historic information. This included various field mapping campaign data sets, information memorandums/reports, faxes and production summaries. Interestingly, in 1997, about 4,400t of ore was mined from the supergene zone of the ore body, with an average reported grade of 3.5% Cu - the output was sold to a nearby heap leach operation at Mt Cuthbert. Notably, the syndicate that oversaw this production in 1997 used ripping to target the near vertical orebody, then loaded mined ore onto haulage trucks for direct transport to the buyer's facility. The mining was shallow and appears to expand upon remnant pits worked on in 1993. More specifically, the three pits - East (Pit 1), Central (Pit 2) & West (Pit 3) - reached up to circa 34m along strike and 5-10m. According to historic reports the mineralisation underpinning the significant drilling intercepts is supergene copper ore that includes malachite, azurite, cuprite and tenorite. Notably, these are all associated with a north-east trending fault (062o to 242o) that is intruded by a porphyry dyke. The porphyry dyke had been described as brecciated in localised zones, opening the possibility of additional conduits for mineralisation post emplacement. Malachite, azurite, cuprite and tenorite have all been observed in: 1) ore dumps at surface; and, 2) in various, readily accessible, shallow open pit workings that targeted the porphyry dyke. The north-east trending fault was interpreted to be normal fault, with a dextral component (strike slip) and no significant displacement2. More significantly, the key takeaway is the north-east trending fault apparently controls where the intrusive porphyry dyke can occur, within the host rock of brown quartz sandstones. The brown quartz sandstones were noted in the 1993 drilling logs to have been sheared and/or fractured near to the porphyry dyke which potentially provides further conduits for mineralisation. One opportunity is to evaluate the `gossan' mineralisation noted to the north of the Big One Deposit. Four drill-holes followed the porphyry dyke to the west onto another historic exploration tenure held separately. However, for the first time, WME's entire 1993 RC drilling exploration data set2 resides within CCZ's current tenure EPM 26574. In turn, this provides a unique opportunity to target the porphyry dyke mineral system. In reviewing newly obtained historic documents then reconciling these with already known facts, CCZ's geology team interpret there is either a fault splay or parallel to sub-parallel fault diverting the western mineralised extent to the south-west. However, fieldwork is necessary to ascertain how this could affect any exploration drilling plans to target the western end of the porphyry dyke mineral system. Further, the 1993 drilling report noted the campaign had specifically been designed to target 25-35m sub- surface, focusing on intersecting the supergene ore zone, with the average total depth less than 62m. The drill-holes range from circa 25m to circa 55m apart along strike from the porphyry dyke. The exploration upside for the Big One Deposit is to primarily define the extent and grade of the supergene zone that could be mined by open pit methods. Secondarily selected drill-holes could potentially act as scout drilling to target and characterise the extent and grade of the sulphide ore underpinning the supergene enrichment. The observations of the dyke intruded into the fault indicate the true width at surface ranges from 2-5m, with extensive sericitic alteration producing a distinct greenish colour. Further, the 1993 drill logs and associated assay results from 1m RC samples, demonstrate the porphyry dyke is associated with significant copper mineralisation controlled chiefly by malachite & chalcocite. In addition, the porphyry dyke is interpreted to be near vertical (85 degrees) and striking parallel to sub- parallel to the north-east trending fault (062o to 242o) with: True widths up to circa 6.5m at a circa 30m depth; and True widths up to circa 2.0m at a circa 60m depth. The porphyry dyke appears to pinch and swell in the drill-hole data. This is probably due to the variation of true width between the 30m and 60m depths, as it is a function of significantly fewer intercepts: three drill-holes at circa 60m depth versus 19 drill-holes at circa 30m depth. Although the Big One Deposit mine lease lapsed during 20166, the historic information does not discuss if any geological mapping was completed to target the eastern linear continuation of the underlying structures that were mined. The structure continues east but the topography makes truck mounted drilling less feasible. A review of legacy mineral production records at the Boomerang Mine stretched from 1944-74 verified that circa 4,211.2t of oxide ore had been mined grading a significant 6% Cu, producing 250.9t copper metal.