Summary of Mineral Resources at the end of Fiscal Year ended December 31, 2023 Measured Mineral Resources Indicated Mineral Resources Measured + Indicated Mineral Resources Inferred Mineral Resources Coal Quality (Dry Basis) Raw Coal Quality (Dry Basis) Raw Coal Quality (Dry Basis) Raw Coal Quality (Dry Basis) Raw Amount (000 Tons) Ash (%) Relative Density (Lbs./Cu.Ft.) Amount (000 Tons) Ash (%) Relative Density (Lbs./Cu.Ft.) Amount (000 Tons) Ash (%) Relative Density (Lbs./Cu.Ft.) Amount (000 Tons) Ash (%) Relative Density (Lbs./Cu.Ft.) Area Berwind Complex 558,581 20.41 91.06 70,375 20.41 91.06 628,956 20.41 91.06 4,495 20.41 91.06 Knox Creek Complex Big Creek Property 35,021 14.10 91.42 — — — 35,021 14.10 91.42 — — — Knox Creek Property 234,093 13.62 87.77 6,580 13.62 87.77 240,673 13.62 87.77 — — — Elk Creek Complex Ram Surface 96,776 15.42 88.42 12,626 15.42 88.42 109,402 15.42 88.42 — — — Crucible Deep 2,285 8.74 84.04 730 8.74 84.04 3,015 8.74 84.04 — — — Stonecoal No. 2 Alma Deep Mine 19,928 14.32 86.83 3,041 14.32 86.83 22,969 14.32 86.83 — — — Rockhouse Eagle Deep Mine 4,065 19.62 89.07 35 19.62 89.07 4,100 19.62 89.07 — — — Moorfork Mine 2,390 15.49 82.24 360 15.49 82.24 2,750 15.49 82.24 — — — Bens Creek Deep Mine 15,510 25.83 93.81 24,425 25.83 93.81 39,935 25.83 93.81 — — — Lower War Eagle 4,965 21.76 90.64 2,870 21.76 90.64 7,835 21.76 90.64 70 21.76 90.64 Glen Alum Tunnel #1 Deep Mine 9,295 4.80 81.13 10,855 4.80 81.13 20,150 4.80 81.13 815 4.80 81.13 Gilbert Deep Mine 2,085 23.56 92.66 2,565 23.56 92.66 4,650 23.56 92.66 85 23.56 92.66 Grand Total 984,994 134,462 1,119,456 5,465 Notes: ● Mineral Resources reported above are not Mineral Reserves and do not meet the threshold for reserve modifying factors, such as estimated economic viability, that would allow for conversion to mineral reserves.
Summary of Mineral Resources at the end of Fiscal Year ended December 31, 2024 In-Place Resources (000 Tons) (000 Tons) Coal Quality (Dry Basis) Raw Measured Indicated Total Inferred Ash (%) Relative Density (Lbs./Cu.Ft.) Area Berwind Complex Red Ash 2 15,740 - 15,740 - 8.25 86.48 Tiller 11,230 - 11,230 - 22.38 92.68 Greasy Creek 2 3,325 - 3,325 - 30.55 97.27 Pocahontas 11 8,030 - 8,030 - 22.64 91.73 Pocahontas 10 11,075 - 11,075 - 15.90 87.94 Pocahontas 9-2 33,226 45 33,271 - 17.00 86.95 Pocahontas 9-1 9,700 15,920 25,620 4,495 17.00 88.61 Pocahontas 6 8,303 - 8,303 - 38.10 101.74 Pocahontas 5 41,755 1,512 43,267 - 11.40 85.44 Pocahontas 4 50,233 6,683 56,916 - 18.20 88.96 Pocahontas 3 127,914 8,481 136,395 - 16.19 88.02 Squire Jim 243,471 37,734 281,205 - 25.00 94.39 Berwind Complex Total 564,002 70,375 634,377 4,495 20.41 91.06 Knox Creek Complex Big Creek Property 35,775 - 35,775 - 14.10 91.42 Knox Creek Property 234,093 6,580 240,673 - 13.62 87.77 Knox Creek Complex Total 269,868 6,580 276,448 - 13.68 88.28 Elk Creek Complex Ram Surface 96,776 12,626 109,402 - 15.42 88.42 Crucible Deep 2,285 730 3,015 - 8.74 84.04 Stonecoal No. 2 Alma Deep Mine 16,202 2,917 19,119 - 14.32 86.83 Rockhouse Eagle Deep Mine 4,065 35 4,100 - 19.62 89.07 Moorfork Mine 2,390 360 2,750 - 15.49 82.24 Bens Creek Deep Mine 15,510 24,425 39,935 - 25.83 93.81 Lower War Eagle 4,965 2,870 7,835 70 21.76 90.64 Glen Alum Tunnel #1 Deep Mine 9,295 10,855 20,150 815 4.80 81.13 Gilbert Deep Mine 2,085 2,565 4,650 85 23.56 92.66 Elk Creek Complex Total 153,573 57,383 210,956 970 16.60 88.59 Maben Complex Sewell 13,336 1,153 14,489 - 12.20 85.61 Welch 378 - 378 - N/A 88.60 Little Raleigh 748 273 1,021 - 43.95 105.42 Beckley 43 - 43 - 9.82 84.13 Lower Beckley 29,527 - 29,527 - 15.43 87.63 Fire Creek 536 288 824 - N/A 88.60 Pocahontas No. 9 1,042 51 1,093 - N/A 88.60 Pocahontas No. 6 33,780 1,826 35,606 - 18.35 89.45 Pocahontas No. 4 51,732 2,175 53,907 - 24.99 93.59 Pocahontas No. 3 88,476 4,683 93,159 - 22.21 91.86 Maben Complex Total 219,598 10,449 230,047 - 19.78 88.10 Grand Total 1,207,041 144,787 1,351,828 5,465 Notes: ● Mineral Resources reported above are not Mineral Reserves and do not meet the threshold for reserve modifying factors, such as estimated economic viability, that would allow for conversion to mineral reserves.