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1 Estimation of Salt Load from Spoil Material Based on Drill Samples- <br />2 <br />B. R. Gardner <br />3 <br />4 <br />5 Introduction <br />8 The potential for stream and groundwater contamination required <br />~ for mining permit applications must be provided from pre-mining drill <br />8 sample analysis. Some of [he needed quantities which may be determined <br />9 from the drill samples are total salt load, the maximum concentration <br />10 of leaching salts in the leachva[er and the relationship between salt <br />11 concentration sad water leached. <br />12 When geologic material is disturbed by mining, the surface area <br />13 available for contact with the pore water within the material is <br />14 increased markedly~thue alloying an increase in the overall rate of <br />15 dissolution of the salts. One of the major problems in sample <br />16 preparation for determination of soluble salts is that the amount of <br />lq salt dissolved and Leached out of the sample material in a given time <br />1B with a given amount of eater depends strongly on the particle size <br />19 distribution of the sraterial in the sample. The rock in the substrata <br />20 breaks dow during removal in a manner related to the character of the <br />21 material. The rock fragments is a drill sample maq be very different <br />22 in size distribution from that in the field after disturbance <br />23 regardless of [he drilling method. In addition sample preparation can <br />24 further breakdow the material. Aa a result it ie necessary [o be able <br />25 to relate the analysis results for drill samples to any given <br />2B distribution of particle circa that may be caused by the disturbance in <br />27 the field. <br />1 <br />