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Black Obsidian Pit—Permit M-1987-026 112c Conversion Application Rule 6.4.4 Exhibit D Mining Plan (rev 8/2/21) Introduction Current operations consist of a small surface quarry operation contained within a 9.0-acre permitted (110) area; the surface quarry area itself occupies approximately 3.0 acres. Obsidian is the only product that is mined and exported from the site. The known extent of the obsidian deposit being quarried extends beyond the existing quarry area, and extends to a much larger area of land outside the 110 permit. The thickness of overburden lying above the top of the known obsidian deposit ranges from zero feet (i.e., obsidian visible in surface outcrops) to approximately 40 feet deep (as determined through mining and exploratory drilling). In many places the known vertical thickness of the obsidian deposit has been found to be greater than 100 feet. The operator wishes to expand the permitted acreage in order to be able to access and extract additional obsidian deposits for the following reasons: to extend the life of the mine, to increase the annual production of the mine, and investigate additional markets for this unique material. The expanded area will allow an increased rate of production, potentially up to several hundred thousand tons per year,yet still extend the life of the mine several more decades. In this conversion,the operator wishes to expand the existing quarry operation to contiguous land, and is now being called Phase I. Phase I fully comprises the southern half of the 112c permit area. The 112c conversion also includes a significant amount of land to the north of the existing quarry and Phase I, where preliminary determinations indicate a second substantial deposit of black obsidian. This will be considered as Phase II in this conversion, though no details of Phase II are presented at this time. This separate deposit has not been well defined on the ground, and it is only delineated in a preliminary manner on the maps at this time. The operator is including this land area in the 112c permit expansion. When the operator is ready to investigate and develop the northern Phase II obsidian deposit, he will contact DRMS to discuss any necessary documents to provide. Please see the Exhibit C maps, which depict the existing permitted area and 112c permitted area boundaries, and the various areas of activity. The maps depict the existing 110 operation, Phase I of the expanded 112c operation, the general location of Phase II, and the landownership pattern. The maps show the pattern of BLM-managed land and privately-owned land. There is a 9.50-acre 110 permit adjoining and partially overlapping the proposed 112c expansion of the Black Obsidian Pit. The Lucky VI Quarry(Buffalo Hunter Lode—Sharp Lode) is permit M-2016-015, operator Ed Lyons. Approximately 3.17 acres of the Lucky VI Quarry permit(on the Sharp Lode) lies within the Black Obsidian expansion area, along the southeastern boundary. See the maps in Exhibit C showing the boundary locations. Colorado Quarries wishes to include this 3.16-acre overlap area in its 112c expansion due to the shallow obsidian deposit present there, which is not a desired commodity extracted from the 110 permit. Colorado Quarries has been in discussion with Mr. Lyons, with the intention of including the 3.16-acre area in the 112c permit,through a release request of the Sharp Lode portion effective upon approval of the 112c expansion. That paperwork will be filed separately.