Castillo Copper Limited announced exceptional laboratory assay results that confirm a major copper discovery at Big One Deposit, within the Company's 100% owned Mt Oxide Project in Queensland, Australia. Exceptional Assay Results: Castillo Copper has received the final laboratory assay results for the 200 series and six drill-holes (301-306RC) for the 300 series at Big One Deposit within the core Mt Oxide Project. The results include two 40-44m wide potentially economic intercepts from surface, with up to 16.65% Cu: 303RC: 40m @ 1.64% from surface including: 11m @ 4.40% from 24m, 5m @ 7.34% from 28m & 1m @ 16.65% from 29m; 301RC: 44m @ 1.19% Cu from surface including: 14m @ 3.55% from 27m, 3m @ 10.88% from 37m & 1m @ 12.6% from 37m. These results are transformative for Big One Deposit as they provide compelling evidence of a high-grade, shallow, scalable copper system. Notably, the latest assays significantly extend known mineralisation and build on high-grade historic economic intercepts which produced stellar intercepts from supergene copper mineralisation up to 28.4% Cu. Key Observations: The latest assay results have extended original lengths of visually logged mineralised intersections, while laboratory analyses confirmed the presence of high-grade, shallow copper mineralisation in eight drill-holes at Big One Deposit. As a result of analysing the results in depth, Castillo's geology team made the following key interpretations: The full assay results, which included the entire seven drill-holes completed in the first tranche (201-213RC), confirm the presence of at least two mineralised lenses and a low-grade halo around the main ore body. For drill-holes 301RC, 303RC and 213RC the mineralisation is spread out which is significant given the trachyte to diorite dyke is generally 4-6m wide. There is likely secondary enrichment apparent within drill-holes 301RC and 303RC as several 1m samples >10% Cu possibly intersected mineralisation occurring in the transitional zone between the oxide and sulphide domains. Note, this is consistent with earlier observations that confirmed visible malachite (oxide) and chalcocite (sulphide) in RC chips, though more data points are required. Surprisingly, ore grade cobalt readings were noted in 301RC - 12m @ 912ppm Co fm 29m incl: 1m @ 1,435ppm Co. While further work is required to determine the extent of mineralisation, there is potential for significant cobalt credits. Within the high-grade copper zone, there were anomalous readings for silver-arsenic-bismuth and very minor gold readings. Next Steps: Provide an update on the next batch of assay results (307-14RC), plans for a geophysics campaign at Big One Deposit and progress with modelling a maiden JORC resource.