CCZ completes acquisition of Harts Range Project

Further to the announcement on 25 October 2024, Castillo Copper Limited (LSE and ASX: CCZ), a base metal explorer primarily focused on copper across Australia and Zambia, is delighted to confirm it is moving forward with acquiring 85% of the highly prospective Harts Range Niobium, Uranium and Heavy Rare Earths Project via an earn-in arrangement.

Highlights:

• CCZ has met all conditions precedent necessary to progress acquiring 85% of the highly prospective Harts Range Niobium, Uranium and Heavy Rare Earths Project1, circa 120km north-east from Alice Springs in the Northern Territory (NT)
• Historical assays from 28 rock chip samples, sourced from outcropping pegmatites within the granted tenure, reported grades up to 23.2% Nb, 12.7% U and 12.7% Heavy Rare Earth Elements (including 2.85% Dy, 0.32% Tb, 14.9% Ta)1,2
• With the recent field trip by CCZ's geology team1 validating the Harts Range Project's significant exploration potential, the Board is now mapping out forward plans to expedite development work commencing with the Cusp Prospect1:

o The exploration campaign will comprise comprehensive surface sampling and geophysical surveys to generate priority targets to test-drill as well as collecting bulk samples for metallurgical test-work

• Reflecting its high confidence in the region, CCZ has increased its footprint by ~25% with a proximal exploration license application3 - "Harts Range East Project" - that has comparable underlying geology to the granted tenure (15km west):

o The initial focus will comprise undertaking a desktop review to generate key insights for the inaugural post-grant exploratory field trip

• The Board's strategy to advance the NWQ Copper Project, possibly with a development partner, and divest the two remaining assets - BHA West Project (NSW) and Mkushi Project (Zambia) - remains on track
• CCZ has enjoyed recent inflows of ~$730k, including proceeds from exiting the RIM4 position (lifting current liquid funds to ~$1.65m); pleasingly, the next value creating event for the Board is closing the sale of Cangai Copper Mine to IMI - currently valued at ~$1.6m5

Ged Hall, Chairman, commented: "Recognising the excellent exploration potential the Harts Range Niobium, Uranium and Heavy Rare Earths Project delivers, the Board has moved swiftly to close out this transformational transaction and increase the footprint within the region. The Board is now working closely with the geology team to expedite ramping up the development campaign. Concurrently, the Board's strategy to create value from non-core asset disposals is making solid progress: CCZ has exited its Rimfire Pacific Mining equity position and is working on closing the Cangai Copper Mine sale to ASX listed Infinity Mining."

A NEW ERA COMMENCES

Harts Range Project

Within the granted tenure are five prospects - Cusp, Bobs, Bobs West, Thorium Anomaly and Niobium Anomaly - where 28 assayed historical rock chips from outcropping pegmatites produced stellar grades up to 23.2% Nb, 12.7% U and 12.7% Heavy Rare Earth Elements (including 2.85% Dy, 0.32% Tb, 14.9% Ta)1,2.

CCZ's geology team recent field trip to the Harts Range Project was highly encouraging as it validated the tenure's significant exploration potential. As a result, the Board is now working closely with the geology team to fast-track development work, initially focusing on the Cusp Project which shows consistently high Niobium, Heavy Rare Earths and Uranium grades1 (Figure 1).

FIGURE 1: HISTORICAL ROCK CHIP RESULTS - CUSP PROSPECT (PCT)

Note: Niobium is typically coincident with Heavy Rare Earths mineralisation, Tantalum and Uranium

Source: CCZ ASX Release - 21 October 2024

The objective of the exploration campaign is to undertake comprehensive surface sampling and geophysical surveys to generate priority targets to test-drill. Complementing this effort will be collecting bulk samples to simultaneously progress metallurgical test-work to ascertain if mineralisation will liberate easily.

Harts Range East Project

Following the geology team's positive visit to the region, the Board decided to further expand the footprint given the encouraging prospectivity for Niobium, Heavy Rare Earths and Uranium mineralisation. As a result, CCZ has applied for incremental ground circa 15km east of the granted tenure - "Harts Range East Project" - which increases the footprint by circa 25% (~135km2).

As shown in Figure 2, the Harts Range East Project (~25km2) is in the central portion of the Enita Dome, with arguably comparable underlying geology to the granted tenure 15km west.

Notably, the Entia Dome is underlain by the Harts Range Group (Harts Range Meta-igneous Complex), which predominantly consists of feldspar-biotite-amphibole-garnet gneisses. Moreover, the Harts Range region has undergone repeated and substantial crustal re-working between Proterozoic and Palaeozoic times. As a result, it is now believed to represent an ancient and strongly altered/metamorphosed version of a continental collision zone6.

Magnetotelluric data interpreted by a team consisting of Adelaide University and NTGS geologists (Selway et al, 2006)7 suggests the Entia Dome system is a deep-crustal feature that can be shown extending to the mantle.

FIGURE 2: HARTS RANGE / (EAST) PROJECTS RELATIVE TO ENTIA DOME

Source: Scrimgeour 2013 (Reference 6)

Similar to the granted tenure, the Harts Range East Project is readily accessible via a sealed highway and well-maintained tracks. Furthermore, given the close proximity of ASX-listed Independence Group's (ASX: IGO) sizeable Irindina Project8, the mining infrastructure and access to a talented labour pool is first rate (Figure 3).

The initial focus for the Harts Range East Project will comprise undertaking a desktop review to garner key insights for the maiden post-grant exploratory field trip.

FIGURE 3: HARTS RANGE EAST PROJECT RELATIVE TO MINING INFRASTRUCTURE

Source: CCZ geology team (Reference 1 & 8)

NEXT STEPS

To recap, the geology team intends to fully unpack the potential of the Harts Range Niobium, Uranium and Heavy Rare Earths Project through undertaking a systematic and rigorous exploration strategy that will encompass the following steps in subsequent visits:

• Full historic and spatial database compilation;
• Reconnaissance mapping programs;
• Close spaced geophysical survey;
• Detailed mapping and rock chip sampling across prospects;
• Regional soil sampling campaigns as required;
• Mineral characterisation studies and petrological analysis;
• Trenching and bulk sample test work;
• Target generation and prioritisation; and
• Drill-testing.

In accordance with ASX Listing Rule 5.23.2 and in relation to exploration results reported in the Announcement, Castillo is not aware of any new information or data that materially affects the exploration results included in previous market announcements.

• Spatial Territory Resource Information Kit for Exploration (STRIKE); NT Government - Department of Industry, Tourism and Trade. Available at: http://strike.nt.gov.au/wss.html
• RIM ASX Release - 11 January 2024
• CCZ ASX Release - 3 October 2024. Note: Estimated value of ~$1.6m based on consideration of 40m IMI shares at a price of $0.03 per shares as at 23 October 2024 (i.e. 40m x $0.03 = $1.2m) and 20m 5 year options exercisable at $0.07 cents using the Black-Scholes Option Model (below).

BLACK SCHOLES OPTION MODEL

• Scrimgeour IR, 2013. Chapter 29: Irindina Province: in Ahmad M and Munson TJ (compilers). 'Geology and mineral resources of the Northern Territory'. Northern Territory Geological Survey, Special Publication5.
• Selway K, Heinson G and Hand M, 2006: Electrical evidence of continental accretion: Steeply dipping crustal-scale conductivity contrast. Geophysical Research Letters 33, L06305, doi:10.1029/2005GL025328.
• IGO Exploration Activities in Northern Territory. 2024 Annual Report (p.6) IGO ASX Release - 29 August 2024. Available at: https://www.igo.com.au/site/investor-center/annual-reports

About Castillo Copper

Castillo Copper is listed on the LSE and ASX under the ticker "CCZ".