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HOMAKE ROY R. CELLAN CORPORATE MANAGER RECLAMATION November 15, 2000 Nov? y ?~~ ®iVisioq o/Minerals and 6eufa9Y ,sue:. 'fa - +. i~ "`~ 'G~1- ~579,2i `~~~~,A State of Colorado f' /`~ `°'~'~"• Division of Minerals and Geology Pa~~.~f' Durango Field Office 701 Camino Del Rio, Room 125 Durango, CO 81301 Attn: Mr. Steve S. Shuey, Reclamation Specialist III IIIIIIIIIIIII III 999 ENVIRONMENTAL, HEALTH, SAFETY AND GOVERNMENT AFFAIRS R~eivea- NOV ~ 2 ?000 D Urv/spn of M e ais & Gep °9Y RE: Bulldog Mine Reclamation Proiect October, 7.000 Monthly Monitoring Report Dear Mr. Shuey: Pursuant to the Technical Revisions to the Reclamation Permit for the Bulldog Reclamation Project, this is the thirty fifth monthly report pertaining to 1) installation and operation of an infiltration trench to accommodate seepage from the 9360 adit, and 2) closing the valve at the 9360 adit plug. The Division of Minerals and Geology IDMGI, in a letter dated March 8, 1999, issued a conditional approval for Homestake Mining Company (HMC) to. close the valve at the 9360 adit plug. Subsequent to DMG's approval, HMC closed the valve to the adit plug on April 1, 1999. Since closure of the adit plug valve, no flow has been directed into the infiltration trench. Monitoring of the hydraulic conditions behind the adit plug indicated that as of August 25, 1999, conditions had stabilized (ie pressure measurements stabilizedl• As a result, DMG approved initiation of the planned tracer test (Ref: Letter from WMCI to Mr. Steve Shuey, dated August 27, 19991. The tracer test subsequently began on September 9, 1999. With the initiation of the tracer test, HMC is committed to the monitoring summarized in Table 1 in accordance with the approved Technical Revisions. The revised monitoring program was initiated in September 1999. A summary of the monthly monitoring data is presented in Table 2. Based on the required visual inspection around the adit plug, the plug is impounding water behind it with no signs of seepage and/or development of seeps around the portal area. No tracer test samples or water quality samples were taken in October 2000 as none were required. As part of this monthly report and in accordance with the 9360 Level Adit Closure Monitoring Plan, dated April 1998, Windy Gulch monitoring was continued during this period. Water levels in the Creede Formation Well, located upslope of the 9360 Adit, have been recorded continuously since its installation, and data for the last year are presented graphically ih figure 1. Flow data for the WGL Weir has been recorded continuously with an automated datalogger since April 19, 2000. As reported in June, the instrumentation was vandalized on May 5, 2000, preventing the collection of any data from that day through June 8, 2000. The equipment was reinstalled in June; however, the stream was HOMESTAKE MINING COMPANY PO. BO%99 • GRANTS. NM 9]020-0011