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May Day and Idaho Mine Complex 112 (d) Permit Application <br />The May Day and Idaho mines are located within southward-dipping sedimentary rocks <br />cut by a series of east-west faults. The May Day Idaho Fault System consists of two <br />eastward-trending reverse faults, each with a down throw to the south with vertical <br />displacement along the two faults of 350-475 feet. The sedimentary units associated with <br />the San Juan Basin are shown below and a broader discussion is presented in Exhibit T <br />Section 6.4.20(8). The shaded units are located in the mine area. (Sources: Eckel, 1949; <br />Toper et. -1 aAO3): <br /> San Juan Basin <br />Age Formation Hydrogeologic Hydrologic <br /> Unit Characteristics <br />Upper Cretaceous Mancos Shale Confining Layer Well yields as much as 10 gpm <br /> <br />' Dakota Sandstone <br />' Dakota Aquifer Well yields as much as 10 gpm <br /> <br />[ Tf?l?ei <br />Jura??i? <br />k Ste <br />`turnson Rgrmat>n ` <br />>- - ?sYM, <br />, , icon r, fcr., 'Y.'DR4L•' <br />W <br />,ell fiY lds <br />°as?much as 25 gpm <br />?? <br /> <br />1i1i1ioCreek Sari??stto ll" <br />ct ?$ , <br />d <br />.. <br /> ??'anakah F <br />ormation <br />- ? <br />? • r'' , <br /> ?, <br />? X <br />c . <br /> Entrada Sandstone 3 ` * Not <br />si <br />r <br />f cant <br />m C <br />l <br />d <br /> <br />Iu? i5?ic and <br />Dolores?Formathon I <br />g <br />u <br />? <br />o <br />ora <br />o <br />co <br />d <br />d? <br />? <br />ifi <br /> ti - <br />nssi <br />ere <br />ssl <br />n <br />cant <br />Upliei 1 rKIS"Itc <br />Permian Cutler Formation Base of San Juan Basin-not considered significant in <br /> Colorado <br /> Rico Formation <br />Pennsylvanian Hermosa Formation <br />Further discussions on the relationships of aquifers with respect to the mining operations <br />are presented in Section 6.4.20(8), Exhibit T. <br />(c) Runoff Plan <br />Baseline mine site surface water drainage basin delineation is illustrated on Figure G-1. Detailed <br />surface water flow characteristics for the 2, 10, 25 and 100 year storm peak flows and discharge <br />flow velocities for the mine site and associated structures are presented in the Storm Water <br />Management Plan (SWMP) as summarized in Attachment T-4. <br />6.4.7(3) Projected Water Requirements <br />The following activities associated with the mining operations on site include: <br />• Mining and Milling and <br />• Dust Control <br />May Day Idaho Mine Complex 112(d) Permit Application <br />April 4, 2011 <br />2