The assay results for diamond core from TT_005DD – undertaken at...

The assay results for diamond core from TT_005DD – undertaken at the Tors Tank
Prospect (refer Appendix A) – significantly boosts confidence in the shallow, clay-
hosted, rare-earth element (REE) discovery, with the best intercept: 13m @ 1,550ppm Total Rare Earth Oxides (TREO) from 5m Notably, high value Magnetic REO (Nd+Pr+Dy+Tb) represented an exceptional
38.9% of the TREO grade vs 25% peer average

Re-assays of 4m composite samples at Tors Tank & Fence Gossan to 1m provided
greater clarity on the underlying geology, whilst delivering further evidence of an
extensive, shallow REE mineralisation system – the best intercepts comprise:

 17m @ 1,605ppm TREO from 2m and 1m @ 3,236 TREO from 19m (FG_003RC)
 10m @ 1,013ppm TREO from 49m (FG_001RC)
 6m @ 1,480ppm TREO from 7m (FG_004RC)
 5m @ 1,598ppm TREO from 14m (TT_002RC)
 4m @ 1,342ppm TREO from 28m (FG_004RC)
 2m @ 3,491ppm TREO from 7m (TT_003RC)

o Assays for circa 70% of the recent hand auger surface sampling campaign across
Fence Gossan delineated a sizeable 4.5km2 anomalous area for REE mineralisation:
 A preliminary interpretation suggests there are several more prime targets to
test-drill that could potentially extend known mineralisation between the Fence
Gossan and Tors Tank Prospects

o A fuller interpretation will be released once all the assay results for the auger
sampling campaign and drill-holes RT_002-004RC are received from the laboratory
Castillo Copper’s MD Dr Dennis Jensen commented: “The Board is delighted with the latest
results, especially the diamond core assay at Tors Tank and exceptional MREO value, as it increases
confidence in the underlying REE system. In addition, the hand auger surface sampling campaign is
proving to be a treasure trove of insights, with several new targets now on the radar. The Board looks
forward to receiving the remaining assays and charting the next phase of the exploration campaign.”


CASTILLO COPPER | 2
ASSAYS BOOST REE CONFIDENCE AT BROKEN HILL
Castillo Copper Limited’s (“CCZ” Board is delighted with the latest assays results for the Tors
Tank and Fence Gossan Prospects, as collectively they materially increase confidence in the
shallow, clay-hosted, REE discovery across the central part of the BHA Project’s East Zone
(Appendix A).
Diamond core
Drill-hole TT_005DD, which produced diamond core from the Tors Tank Prospect (refer Figure 1),
returned an excellent assay result, with the best intercept: 13m @ 1,550ppm TREO from 5m.
More significantly, the high value Magnetic REO, which comprises in-demand REEs
(Nd+Pr+Dy+Tb), represented an exceptional 38.9% of the TREO grade which is well above the 25%
average among the peer group 2