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<br />w.ursasa-srawes orrrerarelea, arc. <br />a.alopn Guarriaa entl lertl ManepemeM <br />fi/ Mam SLCOI <br />Pr~p1p, ye.morn 0.5765 <br />USA <br />Tnl 1802) 4593311 <br />Fer 1e~2) A63210A <br />May 6, 1999 <br />Mr. Rex E. Loeaby <br />Sierra Minerals Corporation <br />6164 S. Newport St., Suiu 2000 <br />Englewood, Colorado 80111 <br />RE: Sierra Minerals Corporation Yule Quarry Permit Applicatiao <br />Dear Rex: <br />OMYA, Inc, has reviewed Sierra Minerals Corporation's permh application being submitted to <br />the Colorado Division of Minerals and Geology. We note that the portal access road has bcen <br />excluded from the proposed affected area. OMYA approves of the proposed exclusion and <br />requests that the portal access road remain open after Sierra ceases permitted mining operations <br />so that access will be available, if required, for future mining operations on the OMYA, Inc. <br />ProP~Y~ <br />We approciau you wminuing to keep us informed of your progress with permitting Sierra's <br />proposed quarry operation. <br />Sincerely, <br />Don Bums <br />(c) Water Resources: The affected azea drains exclusively into Yule Creek. Yule <br />Creek joins the Crystal River neaz the town of Mazble approximately 2.5 miles north of the <br />quarry. The closest standing water is located at beaver ponds approximately 1 mile north of the <br />quarry. In the area near the quarry, Yule Creek is a rapidly falling high mountain stream. It <br />drops approximately 600 feet from the southern end of the New Discovery claim to the northern <br />end of the White Marble claim. Yule Creek, where it joins the Crystal River at Marble, is <br />estimated to have a mean flow of 42 and 76 cubic feet per second during May and June <br />respectively. <br />12 <br />