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u • • <br />t <br />BMRI -San Lars Weist Pit Backfill <br />CHRONOLOGY OF GEOCHEMICAL EVALUATIONS FOR T~-18 <br />1. 09 May 1994, SRK: Permit Modification: West Pit Partial Backf-dl, San L~-is Project, <br />Costilla County, Colorado <br />• WRA (XRF) ~ <br />• Batch Leach ~ Tsf and both types of pCgn <br />• ABA ~ <br />• HCT ~ <br />2. 17 May 1994, BMRI: Geologic Characterization of Potential Backfdl Waste Rock <br />From the "Gneiss Pit" Area of the San Luis Mine Project, Costilla County, Colorado <br />3. 12 July 1995, Geochimica: Geochemfcal Background Rationale for Backfill~ng the <br />West Pit -San Luis. <br />• ABA (pCgn) <br />• EPA Method 1312 Leach (Tsf) <br />4. 18 October 1995, Geochimica: Backfilling the West Pit -San Luis: Sequenal Batch <br />Leach Testing of Pink Gneiss. [Attaches testing report by Chemac and an cal <br />reports by Chemac and Core, dated 03 August 1995.] <br />• WRA (SW846) <br />• ABA <br />• Sequential Batch Leach <br />5. O1 February 1996, Geochimica: Kinetic Testing of Pink Gneiss [Attaches a{~alytical <br />reports by Core, updated on 09 Feb 1996]. <br />• 28-weeks of kinetic test (HCT) data on pCgn <br />6. 12 August 1996, DMG: Evaluation of waste rock leach tests, West Pit disp~sal area; <br />TR-O18;Battle Mountain Resources, Inc.; Permit No. M-88-112 <br />7. 04 and 12 August 1998, BMRI: Elevated TDS in M-11R reported to DMG <br />8. 25 August and 12 September 1998, BMRI: Confirmation Samples reported to DMG <br />9. 24 September 1998, JCIIAlBIVtRI: Initial response submittal to DMG <br />10. 16 November 1998, JCIIA.BMRI: TR-15 Response Plan: Supplemental iVio toying at <br />West Pit, SMRI's San Luis Project, Permit No. M-88-112. [Attaches Appe die A, <br />Select Surface and Ground Water Quality Data and Appendix B, Geochimi a's <br />Geochemical interpretation of October 1998 Pit-Backfill Water Quality.] <br />Geochimica, /nc. <br />22-tan-99 <br />