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Coal Qualities RESERVE AREA SURFACE-MINEABLE Rhoads SEAM 43-101 Properties as of 12/31/2023 Weighted Composite (Moist Basis) RECOVERY ASH SULFUR ⑆CORSA RS, TSX-V: CSO | OTCQX: CRSXF BTU VM Upper Kittanning 92.8% 7.3% 0.5% 12,400 18.5% Rhoads Middle Kittanning 64.3% 10.2% 1.1% 12,700 15.6% Rhoads Lower Kittanning 75.2% 8.7% 1.6% 13,000 15.9% Schrock Run Lower Freeport 94.4% 6.0% 0.7% 13,300 16.5% Schrock Run Upper Kittanning 87.9% 8.7% 1.2% 12,900 17.2% Shaffer Lower Freeport 94.2% 6.4% 0.7% 13,400 17.7% Hamer-Byers Upper Freeport 75.8% 8.7% 0.9% 19.9% Hart Upper Kittanning 65.4% 10.3% 0.9% 13,100 Will Farm Lower Kittanning 73.5% 8.0% 1.0% 13,100 Total 78.6% 8.2% 0.9% 13,100 17.2% AUGER-MINEABLE Rhoads Upper Kittanning 92.8% 7.3% 0.5% 12,400 18.5% Rhoads Middle Kittanning 64.3% 10.2% 1.1% 12,700 15.6% Rhoads Lower Kittanning 75.2% 8.7% 1.6% 13,000 15.9% Hamer-Byers Upper Freeport 75.8% 8.7% 0.9% 19.9% Total 76.0% 8.8% 1.2% 12,800 16.7% HIGHWALL MINER Schrock Run Upper Kittanning 87.9% 8.7% 1.2% 12,900 17.2% Total 87.9% 8.7% 1.2% 12,900 17.2% UNDERGROUND-MINEABLE Casselman Upper Freeport 79.9% 7.8% 1.1% 20.8% Acosta Upper Kittanning 81.0% 10.1% 1.8% 14,600 22.1% Acosta Middle Kittanning 71.5% 13.9% 1.4% 15,500 19.0% Horning Lower Freeport 75.0% 9.8% 1.3% 14,100 18.1% Keyser Lower Kittanning 74.1% 7.3% 1.5% 14,600 20.5% A Seam Brookville 55.5% 11.2% 0.8% 13,700 18.9% Total 72.0% 9.9% 1.3% 14,500 20.3% Grand Total 72.3% 9.8% 1.3% 14,400 20.2% Source: Technical Report dated December 31, 2023. 15

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