Uranium mineralization in the Browns Park Formation within the Project and surrounding area is described as Wyoming sandstone roll type mineralization (Austin and D’Andrea, 1978).

While local mineralization displays some of the characteristics of known uranium deposits in the Gas Hills and Southern Powder River Basin of Wyoming, the mineralization is not necessarily typical of Wyoming roll-front deposits. The uranium mineralization within the Project is sandstone hosted and was deposited along a geochemical solution front, as is typical of roll-front mineralization and similar to other Wyoming sandstone hosted uranium deposits. The features which distinguish mineralization within the Browns Park Formation harken to its eolian origin and include the absence of carbonaceous trash and lack of stratigraphic controls, i.e., the lack of distinct vertical variations in grain size and the lack of intervening finer grained units (Rackley, 1972).

The source of uranium is described as syngenetic, alteration of the tuffaceous volcanic materials within the Browns Park Formation and/or the immediately overlying North Park Formation liberated uranium which was transported by ground water and concentrated along oxidation/reduction interfaces within the formation (Dribus and Nanna, 1982).

The localization of uranium appears to relate to local variations in permeability and the presence of pyrite and/or hydrogen sulphide. Uranium mineralization, in general, app ........

The PEA is based on open pit mining utilizing methodologies, equipment, and a generalized design criterion which has been employed at the site and similar sites in the past. Open pit mining has two major facets: primary stripping or the removal of overburden and the mining of the mineralized material as it is exposed by the stripping.

The conceptual mine designs utilized a 0.6:1 (horizontal to vertical) slope. This allows for a highwall cut at a 0.5:1 slope with 10 foot wide safety benches incorporated at 50 foot vertical intervals. Highwall heights range from less than 40 to slightly more than 200 feet. The open pit design employs similar design parameters and mining equipment configurations to those used successfully in past Wyoming conventional mine operations. Ramps were not specifically incorporated in the designs at this level of study because the pits are quite shallow on the northern or up dip side and will not add significantly to the estimated excavation volumes. Minimum turn radii and travel widths were held to 100 feet.

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