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page 2 <br />NOTES - MLRD BOARD PRESENTATION <br />HOMESTAKE PITCH PROJECT <br />GEOTECHNICAL TOPICS <br />B. Reclamation of Overburden Dumps: <br />1. Homestake Mining has proposed the regrading of all overburden dump <br />slopes to final slope gradients of less than 2:1 (horizontal to <br />vertical). (Slides - Various Dumps) <br />2. That portion of the Indian Creek Valley dump below the elevation of <br />10,310 feet above sea level, referred to as the "10310 Dump", will be <br />rock buttressed and underdrained and reduced to a terraced overall <br />slope of 3:1. (Slide -Debris Flow <br />(Slide - Toe rain Area) <br />3. Stability analyses of the various dumps have determined that these <br />regrading modifications will result in all dumps achieving Static <br />Slope Safety Factors of between 1.3 and 1.5. <br />C. Low-Grade Ore Disposal: <br />1. Homestake proposes to dispose of accumulated low-grade ore in disposal <br />structures located atop the "Tie Camp" and "10450" overburden dumps. <br />(Slides - Existing Piles) <br />2. These structures are founded upon 1 to 2 foot thick clay pads and will <br />be capped with 6 to 12 inch thick clay caps, overlain by a 2 foot <br />cover of overburden material. <br />3. The disposal piles will be sloped to final gradients of 3:1 <br />(horizontal to vertical). <br />4. Drainage will be diverted around the two structures. <br />5. The low-grade ore is not considered to be a hazardous material by CDH <br />or the NRC. <br />JAP <br />9/26/84 <br />