ENFORCE24143

• 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 II
• Media Type: D
• Archive: No

TABLE OF CONTENTS -VOLUME I
L
0 INTRODUC
.
TION ....................................... 1
2.0 DATA COLLECTION .................................... 3
2.1 Tailings Depositional Sequence ........................... 3
2.1.1 Tailings Disposal Area Onetations .................. . . 3
2.1.2 Acidification-Volatization-Recovery Circuit ............... 4
2.1.3 Interim Detoxification Methods ...................... 5
2.2 Field Investigation ................................... 7
2.2.1 Collection of Tailings Samples ....................... 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 Samyle 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 Testine ...............~ ....... 14
2.3.2.3 Leachability ............................ IS
2.4 Column Test Program ................................ 16
2.4.1 Test t~pparatus ................................ 17
2.4.2 Samyle Preparation ............................. 17
2.4.3 Test Procedure ................................ 18
2.5 Additional Data Collection .............................. 18
2.5.1 Underdrain Water Oualitv Monitoring .................. 18
2.5.2 Division's Cyanide Plume Seepage Modeling ....................... 19
2.5.3 Long-Term Underdrain Seepage Flows .................. 20
2.5.4 Quarterly Humidity Cell Testing ...................... 20
3.0 RESULTS ............................................21
3.1 Column Test Results ................................. 21
3.2 Geoch emical Test Results .............................. 23
3.2.1 ANP/AGP Tests ............................... 24
3.2.2 Humidify Cell Test Data .......................... 25
3.2.2.1 r Im undment Tailin H mi i 11 Te ..... 27
3.2.2.2 Lower Imyoundment Tailings Humidity Cel~ ..... 30
3.2.2.3 Quarterly Humidity Cell Test Results ............ 31
3.2.3 EPA Method 1312 Leachability Test Results .............. 32
3.3 Tailing s Pore Water Monitoring .......................... 34
3.4 Tailin gs Pore Water Movement and Underdrain Water Monitoring ..... 35
3.4.1 Division Calculations of Tailings Pore Water Movement ....... 35
3.4.2 Dilution ..................................... 38
3.4.3 Natural Cyanide Degradation ........................ 39
3.4.4 Underdtain_Monitorine ........................... 39
3.5 Lone-Term Underdrain Seeoaee Flows ...................... 40
4.0 CONCLUSION ........................................43