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~~~ ~~~ <br />R~' ~~~ <br /> <br />CML1tH -Exhibit D <br />Mining Plan <br />Page ~ <br />..~:~1~ mil' tis a ba~~ ,~ <br />The 3rd Ridge as thickness of about 30 fee , Recent studies have shown that the formation adR~.P~-~ <br />i may be divided into ree bands: a top lg er-alkali portion nearly 8 feet thick; a center lower- r~ <br />alkali band 15-16 feet in thickness; and a bottom zone of lower lime content which may be ;~'~~~~. <br />upwards of 10 feet thick. These bands have traditionally been designated by chemical analysis. `~~ ~t <br />The are ve difficult to distinguish in the quarries by visual observation. aximum pit depths . <br />will likely be,.I ~,.o.~-R~ ~'yt7 d>~av ~, ~.~,..{-, ~ ~ <br />The 4th ormation contains relatively hi h quan'titie of pyrite yvhere it is fresh and C^`~~'• <br />unaltered. Near-surface weathering has removed the pyrite and has upgraded at least this portion ~ -~ -~ <br />of the 4th Ridge to a useful material, Minin depths in ill be somewhat shallowerb,,~ {a~ <br />than in the other limestone units, with maximum of approximately 30 feet., ~;,~dyl_ <br />S•kr:k" z <br />\y ~°~ <br />The configuration of mining depicted in the drawings with this report has given consideration to <br />the possibility of eventual dam construction at grid 9100N. for dam stability reasons min_i~g of <br />• the,HiCal limestone underneath the proposed dam (and south of the dam) has been limited to a <br />aximum pit depth eet, egnnrng at a distance of 300 feet north of the upstream tce of <br />the dam, extras ono t is limestone unit will widen to approximately 1,100 feet from the <br />outcrop, at which point the pit floors will be nearly 125 feet from the original ground surface. <br />The stratigraphically higher 2nd ridge will be intersected throughout much of its length by the <br />HiCal pit; therefore prior removal of the 2nd ridge overburden and limestone material will be <br />beneficial in that fewer yards of waste rock will be attributed to HiCal mining. <br />The 2nd, 3rd, and 4th ridges will not be extracted beneath o__ r south of the dam footnrint. <br />Mining will begin approximately 200 feet north of the projected upstream dam ice and will <br />advance to the north at a rate commensurate with limestone consumption. <br />The Harroun f ill be the mine o e enter, inclu ' an office, maintenance <br />sanitary facilities and equipment Parking and storage area. Some of t e s c <br />be demolished and some new structures will be built. Existing water and sewer on the Harroun <br />farm will be upgraded to serve up to 20 mine employees and visitors. Southdo__ wn ow~_adequate <br />water rights to supply approximately 150,000 gallons per day needed_to_o~erate the mine. <br />• A summary of mine data is shown on the attached spreadsheet. <br />