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REV99558
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REV99558
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Entry Properties
Last modified
8/25/2016 3:23:25 AM
Creation date
11/22/2007 12:27:57 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M1988112
IBM Index Class Name
Revision
Doc Date
8/24/1994
Doc Name
FAX COVER
From
BATTLE MOUNTAIN GOLD CO
To
DMG
Type & Sequence
TR18
Media Type
D
Archive
No
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ID~ RUG~'94 ?:44 No .001 P.08 <br />acidification/ nattralizatiun potential tests are wndueted the neuttali~ativn results may artificially low <br />owing to this pre-testing consumption of carbonate.) Thu results indiwtc an overall cak presence of <br />carhanate (calcite) Throughout the waste rock which would likely correspond to a wee potential for <br />ucut.ralizing acidic solutions. <br />As slated previously, 1hcrC is an overall correlation between total sulfide wnlcm and ~uld <br />mineralizatiat. As a cross chock of the sulfide concenlratiotts in proposed backfill nr tcrials versus <br />rocks originally in the "Deep West Pit", three ore holes in the "lltap West Pit" wcrclsclected for <br />review and an listed al the end of Table 1. Ure in [here selcGUl holes contains, on ~veragc, l;reatcr <br />than 2 estimated vul k. total sulfides compared with propusai backfill waste which cot~taius lees than 2 <br />vol "% pyrite. 'I'bis indicates that the rocks proposed as backtill fur the "Deep West I'' " anuaiu <br />significantly less total sulfides (ban the [rocks which will be rammed. <br />(:O11C~lIfil011fi <br />i3ased on This study, sort prior studies, the following conclusions may he reachul rtg~rding the rocks <br />which constitute the proposed backtill material for the "Dap West Pil": <br />)) Approxima[ely Slid of propcned backfill tonnage: consists of Tertiary Sa+fta Te Punnation, <br />1'ra::unbrian "pink gneiss", Quaternary alluvium/colluvium, and Tertiary fault clay. None of these <br />rocks were subjected to dte hydrothermal alteration processes which deposited the sulkitlcs associated <br />with the tiara Luis gukl ileprnil. Based on geologic observations and analytical work ~o [late these rocks <br />arc considered to have little to no potential to generate acidic or high metals contxnn'~tion solutions <br />upon interaction wish groundwater aquifers. <br />1) Approximately 42 `% of proposed backfill tonnage consists of footwall gnci s rocks which arc <br />oat-mineralized or mineralized to subcconnmic grades. These rot3cs avcragc less th; 2 vol?h estimated <br />total sulfide content, less than that of the ore grade material which will he removed f om the "llecp <br />West Pit" (see'fable 1). Acidification/ncun•alizationpolcntial and humidify cell tests conducted nn <br />similar rock types fur the rn'iginal permitting pructss indicated "no potential for acid troductian or <br />leaching o1' dcgradational quantities of metals" (SRK reporQ. Ten (lU) sulfidabavi g samples wort: <br />selected for future testing ('fable 2) to provide a confirmation of die results of the or ginal study. <br />3) Nor the proposed backfill area of dte "Deep West 1'it" the original lonuag4 ratio of <br />unahcredhunuineralized "hangingwall" rucks to alterailmincralircd footwall gneiss iy .F7 to I, '!'Lc <br />same ratio tier proposed backtill materials is 1.38 to I . This indicates a much higher relative antoum o1' <br />unaltcrtal and unmineralized tnateri,d is proposed to be retooled to the pit Iltan was ct~'iginally rcuurvcd. <br />4) Approximately GG`9 of the footwall gneiss waste ruck intervals firm the "~inciss J'il Area" <br />were ro-lu);gcd tin• sulfide type: and abundance and carbonate content ('1'ablc 1). Tlti~ evaluation <br />indicates that tlro proposed backfill material contains low total sulfides (average <2 ~4ulr%) <br />cax'cntrations which arc dominated by pyrite with greatly subordinate amounts of c) alcopyrite (avcragc <br /><.5 vol'%.). 'the materials cornain minor earbonatn which may have sutne capacity ~'or neuu'aliz.ing <br />acidic solutions. <br />D. A9. testes Page 5 Grfoingy oJ'Yropnsrrl <br />MnV I2~4 drtrkfil! Wnsrr Rar.•A <br />
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