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STORMWATER MANAGEMENT PLAN For the Yule Quarry Prepared by Sierra Minerals Corporation April, 1999 Received SEP p g pp00 Divbq~ o!~ Field pl(iCe Miners g Gaol o8Y Sierra Minerals Corporation plans to reopen the historic Yule Quarry. Colorado Yule Mazble Company (CYMC), operated the quarry under a permit No. COG-500184 filed with the Colorado Department of Health until the company failed in early 1999. Sierra Minerals intends to re-open the quarry under a new Process Water and Stormwater Permit with the Colorado Department of Health. Much of the following refers to the Location Map and Site Sketch included in this plan and also provided to the Department of Health as part of Sierra's Process Water Discharge Permit Application. The mine's affected area, shown on the Site Sketch, drains exclusively into Yule Creek. The affected area shown cotresponds to the affected area as defined by Sierra's permit application with the Colorado Division of Minerals and Geology. Yule Creek joins the Crystal River neaz the town of Marble approximately 2.5 miles north of the quarry. The closest standing water is located at beaver ponds approximately 1 mile north of the quarry. In the area near the quarry, Yule Creek is a rapidly falling high mountain stream. Based on the drainage area, Yule Creek, where it joins the Crystal River at Marble, is estimated to have a mean flow of 42 and 76 cubic feet per second during May and June respectively. The Yule Quarry is an underground operation. There are existing waste marble piles on surface that remain from prior operators. Most of the waste was generated from quarrying activities that occurred between 1886 and 1941. The Site Sketch, with a background of an aerial photo of the quazry site, clearly shows the surface extent of these waste piles prior to 1990 with the marble's characteristic brilliant white color. The background photograph was taken prior to the operating activities of CYMC. CYMC's activities involved the construction of the private access road, extension of existing waste piles a few tens of feet to the north, east, and south, and construction of access roads on the existing waste piles. Sierra anticipates no significant additions to these access roads, although portions of the roads may be extended slightly or relocated to allow efficient placement of waste marble. The operation will generate low volumes of waste marble. Production rates anticipated by Sierra are between 4,000 and 16,000 short tons of dimension stone annually. Such operations are expected to generate an equal tonnage of waste blocks, gravel, and saw cutting fines. The fines will be small, minus 50 mesh, and will be high in moisture content (estimated higher than 50% moisture) when placed on the waste dumps. The materials will be blended in the dumps to prevent the fines from causing sediment runoff, wind entrainment, and to effectively utilized the waste azea capacity by filling voids between the larger waste rocks. Some of the waste materials may be removed from the site if suitable uses and markets can be developed for them, although initial plans only call for removal ofdimension stone blocks from underground working faces. The primary components of the operation within the affected area wnsist of the existing quarry portal entry driven by CYMC in 1990, three large historic quarry entries from earlier