The coal reserves reported by Corsa 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.

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 wi ........

The Acosta includes Acosta MK (Middle Kittanning), Acosta LK (Lower Kittanning), Acosta UK (Upper Kittanning) mines.

The Acosta mine is an underground mine utilizing the room and pillar mining method.

Production in Acosta will be expanded to include up to 3 seams, with generally no more than 2 of the 3 seams being mined simultaneously at any given time.

Acosta MK mine
The Acosta MK mine is an active mine in the Middle Kittanning seam which is accessed via box cut entry along the outcrop. This mine is a metallurgical coal operation on leased mineral property.

Production is scheduled for 255 days each year, which represents production on Monday through Friday. On each day, two production sections are scheduled to produce coal on two shifts; the third shift is reserved for maintenance and mine conveyor belt and power moves. The sections are configured as regular sections with one continuous miner available for production on each section. Productivity is planned at the rate of 210 feet of advance per shift of operation. A total of 96 employees are assigned to the mine during steady state production.

Principal production equipment includes two continuous miners, four roof bolters, two continuous haulage systems, and two scoops. Coal is extracted from the production face with the continuous miner and hauled to the mine conveyor via continuous haulage. At the conveyor belt, the coal is discharged from the haulage units on ........

Corsa preparation facilities have raw coal handling systems consisting of a rotary breaker and screen used to remove large rock and size raw coal.

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