ENFORCE32691

• Permit No: M1988112
• IBM Index Class Name: Enforcement
• Doc Date: 5/14/1993
• Doc Name: BATTLE MOUNTAIN RESOURCES INC SAN LUIS MINE RECLAMATION EVALUATION VOLUME I
• Media Type: D
• Archive: No

TABLE OF CONTENTS -VOLUME I
1.0 INTRODUCTION ....................................... 1
2.0 DATA COLLECTION .................................... 3
2.1 Tailin gs Depositional Sequence ........................... 3
2.1.1 Tailings Di'Snosal Area Ocerations .................... 3
2.1.2 Acidification-Volatization-Recovery Circuit ............... 4
2.1.3 Interim Detozificadon Methods ...................... 5
2.2 Field Invespgation ................................... 7
2.2.1 Collection of Tailings Samplrs ....................... 7
2.2.1.1 Sample Timing .......................... 8
2.2.1.2 Sample Collection ........................ 8
2.2.2 Tailings Pore Water Monitoring ...................... 10
2.3 Geochemical Test Program ............................. 11
2.3.1 Sample Selection ............................... 11
2.3.2 Geochemical Test Program ................. ....... 12
2.3.2.1 Acid Generating Potential/Acid Neutralizing Potential .. 13
2.3.2.2 Humidity Cell Testing ...................... 14
2.3.2.3 Leachability ............................ 15
2.4 Column Test Prog_r tart ................................ 16
2.4.1 Test apparatus ................................ 17
2.4.2 Sample Preparation ............................. 17
2.4.3 Test Procedure ................................ 18
2.5 Additi onal Data Collection .............................. 18
2.5.1 Underdrain Water f]yt~y Monitoring .................. 18
2.5.2 Division's Cy anide Plume Seepage Modeling ....................... 19
2.5.3 Lone-Term Underdrain Seepage Flows .................. 20
2.5.4 9uarterly Humidit~Cell Testing ...................... 20
3.0 RESULTS ............................................21
3.1 Column Test Resu lts ................................. 21
3.2 Geoch emical Test Results .............................. 23
3.2.1 ANP/AGP Tests ............................... 24
3.2.2 Humidity Cell Test Data .......................... 25
3.2.2.1 r Ira ndment Tailin H midi[ 1 T ..... 27
3.2.2.2 L ower Impoundment Tailings Humidity Cel_l~ ..... 30
3.2.2.3 ~arterl~Humidity Cell Test Results ............ 31
3.2.3 EPA Meth od 1312 Leachability Test Results .............. 32
3.3 Tailing s Pore Wat er Monitoring .......................... 34
3.4 Tailing s Pore Water Movement and Underdrain Water Monitoring ..... 35
3.4.1 Division C alculations of Tailings Pore Water Movement , ...... 35
3.4.2 Dilution . .................................... 38
3.4.3 Natural Cy anide Degradation ........................ 39
3.4.4 Underdrain Monitoring ........................... 39
3.5 Long-Term Underdrain SeeRage Flows ...................... 40
4.0 CONCLUSION ........................................43