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' EXHIBIT D <br /> Geology <br /> ' Swallow Perlite Mine <br /> Swallow Mine is located in a local occurrence of effusive, acidic <br /> volcanic rocks of early Tertiary age within a Precambrian granitic ter- <br /> , rave on the southwest flank of the Wet Mountains. The commodity of <br /> interest is a brown vitreous perlite occurring as irregular pods within <br /> ' a hydrothermally altered and bleached rhyolite. <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br />