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bulkheads should deliver the fol lowing metals load (Ibs/day) to Cement C reek: i ron, <br /><.1; manganese, <.1; zinc, 8. 1 to 20.3; cadmium, .009 to .036; lead, .16 to .40; <br />and copper, .22 to .23. <br />9.7 Acid-Generating Potential of Wall Encrustations <br />The previous parts of Section 9 have considered the most likely effect that country <br />rock and primary vein mineralization will have on impounded water and vice-versa. <br />Secondary mineralization (encrustations on mine walls formed after tunnel <br />construction) is considered in this section. At some other mines, wall encrustations <br />have been shown to have significant acid-generating potential. <br />Coatings of secondary minerals are relatively rare on the walls of the accessible parts <br />of the Sunnyside Mine. The general lack of secondary mineralization is probably due <br />to the overall low permeability of the fractured volcanic rocks which results in mine <br />walls being quite dry in most places. <br />Daring December, 1992, a Simon Hydro-Search hydrogeologist was taken to locations <br />' w!~ere SGC staff had remembered seeing mineral crusts on the walls of the mine. <br />P,~ineral crusts were scraped from the walls and placed in rock sample bags for future <br />' a.~nalysis- <br />i <br />1 <br />I <br />fl:l SIR1011 HYDRO-SEARCH <br />