Investor Presentaiton

EL> AU ED CU D By-Products To Significantly Enhance The Economics Of The Project HIGH TOTAL RECOVERIES OF Proposed Rover 1 Processing Flowsheet Grinding Magnetic ㅁ Separator Gravity Bulk Sulphide Float CO CU GOLD, COPPER AND COBALT METALS Crushed ore 500,000t PROCESSING PLANT > CAPABILITY PROPOSED FOR PRE-FEASIBILITY STUDY Fine Grind ☐ ☐ ☐ SA Magnetic Separator Fine Grind Oxidation END USER PRODUCTS FOR ELECTRIFICATION > INDUSTRIES 95%+ Magnetite Concentrate Product Gold Bullion Pure Copper Pure Cobalt Metal Metal Total Recoveries TBA 92.8% 95.8% 82.8% 10 castile.com.au ASX:CST 4 MARCH 2022 "Outstanding Recoveries of Gold, Copper and Cobalt At Rover 1"

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