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'~` • RECEIVED ~ ~~~ ~~~~~II~~~~~~~~~ NOM ESTAKE nX-~w6 NOV 18 1999 ROY R. CELLAN CORPORATE MANAGER flEC1AMATIGN 9 November, 1999 pivisionWfR°"'!~~ ^(~~, nl ANDIGOVERNMENTAFFAIRS!'~`7AA~~~ b~~~ r _~r .' ~y {-~ ~~ rC. ~„ -- .!„ - ~°A ~ b y~a~4l~ 1 j-S ~ 'h ~OV 1.61999 0lvisp~ p~M° a a/b8 Gep °9Y State of Colorado Division of Minerals and Geology Durango Field Office 701 Camino Del Rio, Room 125 Durango, CO 81301 Attn: Mr. Steve S. Shuey, Reclamation Specialist e RE: Bulldog Mine Reclamation Proiect October, 1999 Monthly Monitoring Report Dear Mr. Shuey: Pursuant to the technical Revisions to the Reclamation Permit fo! [he Bulldog Reclamation" Project, this is the twenty-third monthly report pertaining to 1) installation and operation of ar, infiltration trench to accommodate seepage from the 9360 adit, and 21 closing the valve at the 9360 adit plug. The Division of Minerals and Geology (DMGI, 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 was directed into the infiltration trench. Monitoring of the hydraulic conditions behind the adit plug indicated that as of August 25, 1999, conditions had stabilized lie pressure measurements stabilizedl. As a result, DMG approved initiation of the planned tracer ;ast ;Ref: Letter from WMCI to Mr. Steve Shuey, dated August 27, 1999). The tracer test subsequently began on September 9, 1999. With tf~e initiation of the tracer test, HMC is committed to the moiiit~]~i!ry summarized in Table 1 ire 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 flow was observed in DT-1 during the monthly sampling activities. Minimal flow was observed in DT-2 and samples taken as shown in Table 2. Completed analyses of the charcoal and water samples taken during this period as part of the tracer test indicate that no fluorescein dye was detected in any of the samples 4see attached Ozark Underground Lab analytical resultsl. 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. Flow was observed through the WGL Weir during this period and a water quality sample (WGL Weir) taken on October 6, 1999. Analytical data for this sample are attached. The estimated flow through the weir at the time of sampling was approximately 10 gpm. Continuous flow monitoring at the WGL Weir was initiated in April 1999. Figure 2 summarizes the flow through the weir to date. Thank you for your time and attention on this matter the San Francis fice. er ~ y Y s, cc: A. Cox, HMC San Francisco F. Martinez, Alamosa BLM D- Holmer, Colorado WQCD, Denver J. Rowe / S. Randall, WMCI, Denver If you have any questions, please contact me in HOMESTAKE MINING COMPANY P.O BOX 98 • GRgNTS, NM 8]020.0011