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1 ~ ~ 3 <br />F,XHIRIT D (Revised 4-25-73) <br /> For 29 years (19?8-1957) limestones were supplied from <br /> several of the upper bands im mediately north of the plant <br /> and <br />uarried northward about Pl <br />nt m <br />dific <br />ns <br />3/4 mile <br />ti <br /> q . <br />a <br />o <br />a <br />o <br /> (1956-5r) required limestones with a minimum of kerogen, <br /> namely all of the A-band (14 ft. avg. thickness) and 10 <br /> t.o 12 feet of the overlying B -band (fi0 ft. avg. this}:Hess). <br /> A-band material economic al to remove proved to Ye three <br />' dragliiie cuts with the excess B-band overburden moved west- <br />' ward successively as each A-b and cut was removed. See the <br /> typical r_ross-section sk.e+.ch of this quarry on the pre- <br />' cedir~R; pal{e. Ar this A-band quarry advanced northward. <br /> increased haul distance made it economical to recover more <br />' A-band from a fourth cut in minimum overburden areas. <br />Overburden from this fourth cut is moved east. on top of <br />C-band and/or west into the worked out quarry. <br />In llovember• 1976, Ideal's Board of Directors approved <br />an expenditure to install a grate preheater kiln at the <br />' l3oetLclier pLinL which will be one of the most energy ef- <br />ficient in the world. Most of the C and E-bands are <br />' chemically suitable. The kerogen content of these lirue- <br />' stones twill enhance energy efficiency. Appreciable re- <br />serves of these materials are present including previously <br />' disturUed 1928 to 1957 quarry areas. The new kiln will <br />involve a modest increase in quarry output from 550,000 <br />to 800,000 Inns oC limestone per year. <br /> <br />