Announcement • Aug 07

Inventus Mining Corp Reports Heap Leach Test Results At Pardo River of Gold Project

Inventus Mining Corp. had positive metallurgical heap leach test results completed on material from the Company's 100%-owned Pardo "River of Gold" Project, located 65 km northeast of Sudbury, Ontario. The program evaluated gold recovery across multiple crush sizes and leach durations and provides a technical basis for detailed testing and potential integration as a future processing strategy. Column leach recoveries ranged from 66.9% to 74.5% after 78 days at crush sizes of -1/2 inch, -3/8 inch and -1/4 inch. The -1/4 inch column recovered 64.3% in 27 days, 72.0% in 48 days, and 74.5% after 78 days, identifying an initial 27-to-48-day optimization window for further testing. The -1/4 inch had a favourable reagent profile with low total cyanide consumption of 1.14 kg/t over 78 days and required no lime addition to maintain optimal leach pH above 10.5. Process Mineralogical Consulting Ltd. tested a 310 kg composite of Trench 1 bulk sample material. Three columns containing approximately 59 to 65 kg of material were prepared at crush sizes of -1/4 inch, -3/8 inch and -1/2 inch. The columns were leached for 78 days using a 0.5 g/L sodium cyanide solution applied at a standard laboratory flow rate. The calculated head grades ranged from 1.51 to 2.69 g/t gold with results presented in Table 1 below. Column A -1/4 inch 2.694 g/t gold recovery 64.3% in 27 days, 72.0% in 48 days, 74.5% in 78 days. Column B -3/8 inch 1.514 g/t gold recovery 53.1% in 27 days, 60.0% in 48 days, 66.9% in 78 days. Column C -1/2 inch 1.910 g/t gold recovery 61.1% in 27 days, 65.1% in 48 days, 69.5% in 78 days. The -1/4 inch column demonstrated the clearest indication of a potential optimized heap leach cycle. Recovery increased to 64.3% by day 27 and 72.0% by day 48, then increased more gradually to 74.5% by day 78. Based on the current laboratory data, a 27 to 48 day cycle is an initial target for optimization. Results showed that 86% to 92% of the unrecovered gold in the column residues was contained in the coarse fraction, indicating that gold liberation and solution access are important controls. Process Mineralogical Consulting Ltd. concluded that heap leaching may not be the preferred route for the tested higher-grade composite where maximum recovery is the objective. Process Mineralogical Consulting Ltd. also noted that the performance of this higher-grade composite cannot be used to predict the response of a lower-grade feed, which must be tested directly. Inventus Mining Corp. believes the results support evaluating a flexible two-product processing approach rather than applying a single recovery method to all material. Under the concept being evaluated, crushed material would be ore sorted to produce a smaller-volume, higher-grade product for transport to an existing mill. A lower-grade fraction could be retained at site and processed by heap leaching if direct testwork demonstrates acceptable recovery, permeability and reagent consumption. The concept could reduce the tonnes transported and conventionally milled while preserving the potential value of lower-grade material. This conceptual flowsheet has not yet been supported by an economic study and remains subject to metallurgical testing, engineering, permitting and economic analysis. The metallurgical program was completed by Process Mineralogical Consulting Ltd. under project JAN2026-08. A 310 kg composite of Trench 1 material was dried, crushed and split for column and bottle roll testing. The three column tests used 0.5 g/L sodium cyanide solution and were operated for 78 days. Gold recovery was calculated using gold captured on activated carbon together with final residue assays. Multiple large-mass Photon assays were used to reduce sampling uncertainty associated with the coarse-gold nugget effect. Calculated head grades are reconciled values based on recovered gold and residual gold. The results are laboratory-scale and pertain only to the samples tested.

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