Laserfiche WebLink
BulldaR Mine TailirsRS Ponds Evalunlion <br />TABLE OF CONTENTS <br />1.0 INTRODUCTION ....................................................................................................................1 <br />1.1 Background for 1996 Activities .......................................................................................1 <br />1.2 Sequence of 1996 Activities ..............................................................................................2 <br />1.3 Use of Evaluation Results .................................................................................................2 <br />2.0 SITE HISTORY .......................................................................................................................4 <br />2.1 Tailings Pond Operation ..................................................................................................4 <br />2.2 Remedial Activities ...........................................................................................................4 <br />3.0 FIELD INVESTIGATIONS ..................................................................................................7 <br />3.1 Initial Iovestigations .........................................................................................................7 <br />3.2 Supplemental Investigations ............................................................................................8 <br />4.0 GEOTECHNICAL ANALYSES ..........................................................................................13 <br />4.1 Geotechnical Laboratory Testing ..................................................................................13 <br />4.2 Tailings Moisture/Saturation Conditions .....................................................................13 <br />4.3 Hydraulic Properties of Tailings ...................................................................................14 <br />4.4 Current State of Consolidation of Tailings ..................................................................15 <br />4.5 Tailings Flow Conditions ...............................................................................................16 <br />4.6 Flow and Dilution Modeling ..........................................................................................17 <br />5.0 GEOCHEMICAL ANALYSES ............................................................................................24 <br />5.1 Acid Generation Potential of the Tailings Solids .........................................................24 <br />S.l.l Acid Base Accounting (ABA) Analyses ...................................................................24 <br />5.1.2 Mineralogic Analyses ...............................................................................................26 <br />5.1.2.1 Mineralogic Analyses Methods ....................................................................26 <br />5.1.2.2 X-ray Diffraction Analyses ..........................................................................26 <br />5.1.2.3 Thin Section Analysis ..................................................................................27 <br />5.2 Oxygen Profile and Oxygen Consumption Measurements in Near <br />Surface Materials ............................................................................................................28 <br />5.3 Chemical Analysis of Tailings Pore Water and SPLP Testing ...................................29 <br />5.4 Attenuation of Lead, Antimony, and Manganese in Creede Formation <br />Soils and Sedimeots ........................................................................................................31 <br />5.4.1 Attenuation Tests Materials ......................................................................................32 <br />5.4.2 Attenuation Test Methods .........................................................................................33 <br />5.4.3 Test Results ...............................................................................................................33 <br />5.4.4 Attenuation Test Interpretation .................................................................................34 <br />6.0 CONCLUSIONS ....................................................................................................................49 <br />6.1 Physical Conditions ........................................................................................................49 <br />6.2 Acid Generation Potential ..............................................................................................49 <br />6.3 Tailings Pore Water and Leachate Chemistry .............................................................49 <br />6.4 Attenuation of Seepage ...................................................................................................50 <br />6.5 Dilution of Seepage .........................................................................................................50 <br />7.0 REFERENCES .......................................................................................................................51 <br />Nomestake ,Llining <br />p:H'.JNNnlldp.rpr <br />$Irepherd .hiller, lnc. <br />IV ,~pnl li. 199i <br />