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M-1978-349 (Dick Casey Concrete Pit) <br />2009 Technical Revision <br />March 31, 2009 <br />Page 3 <br />Exhibit D - Mining Plan <br />The basic operations of the Dick Casey Concrete Pit will remain largely unaltered by <br />this Technical Revision. The site will continue to be dry-mined for alluvial <br />aggregates, with primary processing on the pit floor and batch plant operations at <br />grade nearer to the access. However, to accommodate more efficient resource <br />recovery, a number of technical changes are noted below. <br />Procedures and methods for mining described in the original 112c Reclamation <br />Permit remain mostly the same. The location of existing features, immediately <br />adjacent structures, and other pertinent information are also portrayed on the <br />revised Exhibit C maps. Life of the mine, based on the present demand for <br />materials and on revised plans, is estimated to be about 20 years. This includes five <br />to ten years of mining and an additional five to ten years of reclamation. The actual <br />rate of mining will depend on demand for materials over the course of mining. <br />Mining Methods <br />Mining methods are unaltered by this Technical Revision, as clarified here. Prior to <br />mining, the upper 12 to 18 inches of topsoil will be stripped from the area to be <br />disturbed and stockpiled selectively at the perimeter of the site (see Exhibit C-2). <br />Stripped topsoil will generally be stockpiled south and east of the active mining area, <br />until needed for concurrent reclamation. Overburden will be stockpiled along <br />portions of the northern permit/property boundary (as shown on Exhibit C-2) for later <br />use in reclamation. Generally, temporary stockpiles and berms will have a 2:1 slope <br />on sides exposed to the public view. As a stabilization measure, any topsoil that is <br />to be stockpiled longer than one growing season will be broadcast seeded upon <br />placement and subject to a weed control program. The site will then be mined to a <br />depth of approximately 35 feet. <br />3