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~~b~, HOM'E~, AKE • <br />O <br />ROY R. CELLAN <br />CORPORATE MANAGER <br />RECLAMATION <br />12 April, 2000 <br />III IIIIIIIIIIIII III • <br />999 <br />~1L~: -~~~ Z~~Y <br />s1rE: Quc~~ <br />j~C~Yo ~ f <br />~cr~ D ,._ <br />"~ ~Por r <br />State of Colorado <br />"r~'. Division of Minerals and Geology <br />Durango Field Office <br />701 Camino Del Rio, Room 125 <br />Durango, CO 81301 <br />ENVIRONMENTAL. HEALTH, BAFETV <br />ANO GOVERNMENT AFFAIRS <br />Received <br />APR ~ y 2000 / <br />~rysb ~~9o F~qM OlII <br />o/Minerals g ce <br />Geolo9Y <br />APR <br />vr~'~'o~o~~,; ~~ G400 <br />Attn: Mr. Steve S. Shuey, Reclamation S ecial' ~i~l <br />RE: Bulldog Mine Reclamation Project (March, 2000 Monthly Monitorin Re ort <br />Dear Mr. Shuey: <br />Pursuant to the Technical Revisions to the Reclamation Permit for the Bulldog Reclamation <br />Project, this is the twenty-eighth monthly report pertaining to 1) installation and operation of <br />an infiltration trench to accommodate seepage from the 9360 adit, and 21 closing [he valve <br />at the 9360 adit plug. The Division of Minerals and Geology (DMGI, in a letter dated March <br />8, 1999, issued a conditional approval for Homestake Mining Company (HMC) to close the <br />valve at the 9360 adit plug. Subsequent to DMG's approval, HMC closed the valve to the <br />adit plug on April 1, 1999. Since closure of the adit plug valve, no flow was directed into <br />the infiltration trench. Monitoring of the hydraulic conditions behind the adit plug indicated <br />that as of August 25, 1999, conditions had stabilized lie pressure measurements stabilized). <br />As a result, DMG approved initiation of [he planned tracer test (Ref: Letter from WMCI to <br />Mr. Steve Shuey, dated August 27, 1999). The tracer test subsequently began on <br />September 9, 1999. With the initiation of the tracer test, HMC is committed to the <br />monitoring summarized in Table 1 in accordance with the approved Technical Revisions. <br />The revised monitoring program was initiated in September 1999. A summary of the <br />monthly monitoring data is presented in Table 2. Based on the required visual inspection <br />around the adit plug, the plug is impounding water behind it with no signs of seepage and/or <br />development of seeps around the portal area. No flow was observed in DT-1 or DT-2 during <br />[he monthly sampling activities. Windy Gulch was either frozen or dry in all observed <br />reaches, including the 9700 Weir and the WGL Weir. As a result, no water or charcol <br />samples were collected for tracer analysis during this period. <br />As part of this monthly report and in accordance with the 9360 Level Adit Closure <br />Monitoring Plan, dated April 1998, Windy Gulch monitoring was continued during this period. <br />Significant freezing of Windy Gulch was observed in early November 1999. Consequently, <br />the instrumentation recording flow measurements at the WGL Weir was removed to prevent <br />damage, and continuous flow monitoring, initiated in April 1999, was discontinued for the <br />winter. As such, a water quality sample and record of flow rate were not taken at the WGL <br />Weir during this period. Water levels in the Creede Formation Well, located upslope of the <br />9360 Adit, have been recorded continuously since its installation, and data for the last year <br />are presented graphically in Figure 1. <br />HOMESTAKE MINING COMPANY <br />PO. BOX 9B • GRAMS, NM 8)020-0011 <br />