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May Day Idalio Mine Complex 112(d)Permit Amendment <br /> April 17,2017 <br /> 2.0 Description of Soils <br /> The following areas directly applicable to mining activities within the permit boundary were <br /> evaluated in the field: <br /> 2.1 Areas within Buffer Areas of Operational Areas <br /> These areas potentially may be disturbed for either expansion of operational areas or road <br /> expansion. Areas inspected included: <br /> • The operational areas at May Day No. 1, May Day No. 2, Chief and Lamb; and <br /> • Proposed exploration roads. <br /> These areas allowed for inspection on already disturbed cuts. The soils are typical of the <br /> description of the Nordical Stony soils and are dominated by medium to coarse, angular stones <br /> (>15%) as shown in Plate 1. <br /> 2.2 Operational Areas <br /> Operational areas were characterized by essentially being graded to weathered bedrock. There <br /> was no evidence of soil development in these locations. <br /> Areas that have not been recently accessed for operational purposes (e.g. Lamb Operational Area <br /> and old roads near the Brooklyn and 810 adits) showed signs of natural regeneration (Plate 2). <br /> 2.3 Location of Augmentation Pond <br /> The proposed augmentation pond is located in the Idaho Operational Area. The soil in this area <br /> is composed of gray, silty clay material with occasional gravels to a depth of approximately 14 <br /> inches. Munsell values were 3, indicating reasonable(5-10%) organic matter concentrations. <br /> Below this depth, the gravels increased significantly and a spade could not be advanced beyond <br /> this depth (Plate 3). <br /> 2.4 Access Road <br /> The access road is cut through three parent materials: <br /> • Soils in the upper part of the road are formed on colluviums terrace deposits(Plate 4); <br /> • Soils in the lower part of the road are formed on sandstone of the Morrison Formation; <br /> and <br /> • Soils on historical tailings within the floodplain. <br /> Soil development was evident in the tipper part (0-6") of the colluviums. Below 6"gravels still <br /> dominated the soil profile until contact with the sandstone of the Morrison Formation. <br /> Soil development was not observed on the recently disturbed Morrison formation. <br /> May Day Idaho Mine Complex 112(d)Permit Application <br /> Revised April 10,2017 <br /> 2 <br />