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1.0 INTRODUCTION I 1 I 1 This stormwater plan has been prepazed by Telesto Solutions, Ina (Telesto) and Battle Mountain Resources Inc. (BMRI) to update the "San Luis Project - Stormwater Management Plan" prepared by William E. Payne & Associates, Inc. (May 1994). The San Luis Project (hereafter referred to as the "Project") is located in Costilla County, Colorado approximately five miles northeast of the community of San Luis. The Project was an open pit precious metal (i.e., gold) mine with conventional milling and associated facilities. These facilities have or aze currently undergoing final land reclamation and closure. Ore was beneficiated using carbon-in-leach technology in the mill facility with the resulting spent ore (i.e., tailing) deposited in a zero discharge, composite lined tailing facility. The Project received approval from the Colorado Department of Natural Resources, Division of Minerals and Geology (DMG) in March 1989 with a permit amendment approved in March 1990 (M-88-112). The DMG permit has been subsequently modified through a series of technical revisions approved by DMG. This Stormwater Management Plan has been developed in accordance with the procedures outlined in the Genera] Permit received for the San Luis Project dated September 21, 2001. The plan contains a description of the previous mining/beneficiation facilities, site reclamation and closure activities, a discussion of stormwater discharge points and the stormwater quality controls, and an administrative management plan for these controls, as well as other information required in the General Permit. 2.0 FACILITIES DESCRIPTION 2.1 General The Project was an open pit precious metal mine consisting of the West Pit and East Pit. All mine facilities including the pits aze shown in Figure 1. The open pits are located north of the county road and the Rito Seco drainage that transects the mine property. Each of the open pit mining facilities has been either partially or fully backfilled and reclaimed in accordance with the DMG permit. The beneficiation and support facilities Battle Mountain Resources, /nc. Telesto Solutions, /nc. ,a, mu no,mw~a, me~a~m,n~em~.da 1 May 3, 2002