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~~ ~ III IIIIIIIIIIIIIIII ~ HOME'S AKF ROY R. CELLAN ~ Ii i ~' ~ ~o ~ ~• CORPORATE MANAGER RECLAMATION SEP 2 II 20uJ September 18, 2000 ®ivisionoffllineralsandCealogy State of Colorado Division of Minerals and Geology Durango Field Office 701 Camino Del Rio, Room 125 Durango, CO 81301 ENVIRONMEMAL, HEALTH. SAFETY AND GOVERNMENT AFFPIRS , ~ i ~,, J rya f~: ,•, ~ T ~;;sd~ .. c-r . Attn: Mr. Steve S. Shuey, Reclamation Specialist Receivl~ SSP 2 2 2000 Durar~ ~iefd pmice Divison of Miners g Geology, RE: Bulldog Mine Reclamation Project August, 2000 Monthly Monitoring Report Dear Mr. Shuey: Pursuant to the Technical Revisions to the Reclamation Permit for the Bu!Idog Reclamation Project, this is the thirty third 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 (DMG), in a letter dated March 8, 1999, issued a conditional approval for Homestake Mining Company (HMC) to close the valve a[ [he 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 sampling or water quality sampling was required in July 2000. 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 in 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 dry eliminating any possibility of obtaining a water sample or flow data in July. All valid year 2000 flow data for the WGL Weir are presented in Figure 2. HOMESTAKE MINING COMPANY P.O. BO% 98 • GRANTS. NM 8)020 0011