Corsa Coal indirectly owned Casselman through Maryland Energy Resources, LLC. On January 6, 2025, Corsa Coal Corp. announced that it and each of its subsidiaries (collectively, the “Corsa Group”), filed for voluntary chapter 11 relief in the U.S. Bankruptcy Court for the Western District of Pennsylvania and intend to conduct a sale of assets pursuant to Section 363 of the U.S. Bankruptcy Code. On April 4, 2025, Rosebud Mining Company acquired the Casselman Mine as part of a bankruptcy auction of Corsa Coal's assets.
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Summary:
Geology of the Properties
The geology of the properties is consistent with regional structural trends. In Maryland, the local Casselman synclinal fold is evident in the Casselman mine. Coal seams of economic importance on the properties typically range from 1 foot to 6 feet in thickness and are primarily low-volatile in rank. There are 11 coal seams on the properties that demonstrate reserve or resource potential including, in descending stratigraphic order: Sewickley, Redstone, Pittsburgh, Bakerstown, Upper Freeport, Lower Freeport, Upper Kittanning, Middle Kittanning, Lower Kittanning, Brookville, and Mercer.
Mineralization
Mineable coal seams within the properties are typically low-ash, low to high-sulfur, and high-thermal content bituminous coals. Regionally, the coals are typically low-volatile in rank, with rank increasing from west to east. The maximum seam thickness may reach over 6.0 feet where multiple coal benches occur in proximity to one another; however, the average mineable thickness of the seams in this evaluation generally ranges from 1 foot to 4 feet. Seams are generally continuous but may be locally absent. Secondary discontinuity due to erosional features is present in most areas, resulting in seam outcropping, or visible exposure of the seam at the surface. Other than oxidation of the coal exposed at the surface, erosion of the seams has no significant impact on the mineralized deposits. Mineable seams associated with the properties are generally outcrop-accessible. Coal seams are characterized by both single-bench and multiple-bench coal horizons with parting (non-coal) material varying by seam and area. Seam parting is common within the coal seams on the properties with intra-seam parting material increasing drastically in some areas. Roof strata are typically shale or sandy shale with zones of sandstone roof being common. Floor strata are typically sandstone, shale, sandy shale, fireclay, or in the case of the Upper Kittanning, limestone.
Keyser – Lower Kittanning Seam Reserve
The Lower Kittanning seam has an average thickness of 4.4 feet and underlies the Middle Kittanning seam at an interval of 53 feet. The water pool elevation in the overmined Upper Kittanning seam acts as a mine barrier to northward expansion of the Lower Kittanning resource area. A hydraulic barrier to the south prohibits the mineable resource from extending beyond the 1,750 feet seam elevation which is the bottom of the box cut elevation. These two barriers have reduced the area of mineable coal as originally projected by Wilson Creek Energy.
Deposit Types
The coal reserves reported herein are bituminous coals. The primary coal-bearing formations on the properties are Carboniferous in age, being in the Pennsylvanian system, which includes the Monongahela, Conemaugh, Allegheny, and Pottsville groups. The average mineable seam thickness for coal horizons in these formations ranges from 1 foot to over 6 feet. The coal seams are generally continuous and non-complex but may vary in thickness and may also be locally absent. Seams retain normal stratigraphic sequence throughout the properties and no evidence has been observed that seams have been modified from pre-deformational thicknesses.