Case 1:95-cv-00650-LSM
Document 118-19
Filed 02/06/2008
Page 1 of 12
PE-18-250
Case 1:95-cv-00650-LSM
Document 118-19
Filed 02/06/2008
Page 2 of 12
PE-18-251
Case 1:95-cv-00650-LSM
Document 118-19
Filed 02/06/2008
Page 3 of 12
PE-18-252
Case 1:95-cv-00650-LSM
Document 118-19
Filed 02/06/2008
Page 4 of 12
PE-18-253
Case 1:95-cv-00650-LSM
Document 118-19
Filed 02/06/2008
Page 5 of 12
PE-18-254
Case 1:95-cv-00650-LSM
Document 118-19
Filed 02/06/2008
Page 6 of 12
PE-18-255
Case 1:95-cv-00650-LSM
Document 118-19
Filed 02/06/2008
Page 7 of 12
PE-18-256
Case 1:95-cv-00650-LSM
Document 118-19
Filed 02/06/2008
Page 8 of 12
PE-18-257
Case 1:95-cv-00650-LSM
Document 118-19
Filed 02/06/2008
Page 9 of 12
PE-18-258
USFS 2004
Liberty 2004
USFS and Liberty 2004
1998 USFS Sample Data
1998 Liberty Sample Data
Cyanide Leach Test Fire Assay opt opt none 0.1731 0.1389 0.1345 0.139 0.0573 0.084 0.0407 0.1736 0.0131 0.1103 0.0606 0.0737 0.055 0.0102 0.0313 0.0321
KV-7 -1/4" Head 0.098 0.057 0.131 0.092 0.086 0.086 0.054 0.265 0.433 34.59 0.150 0.172 64.90 0.112 6.00 0.051 13.45 0.007 0.032 59.30 0.019 6.00 0.076 16.76 0.013 0.040 46.50 0.019 3.00 0.151 19.06 0.029 0.045 52.30 0.024 9.00 0.155 10.37 0.016 0.059 64.10 0.038 9.20 0.292 15.12 0.044 0.039 29.80 0.012 15.00 0.083 9.11 0.008 0.042 73.70 0.031 11.00 0.083 11.22 0.009 0.030 30.60 0.009 10.00
Flotation Test Calc. Head % 42.25 58.83 44.57 61.33 55.40 54.65 34.45 9.72 71.34 77.19 51.06 47.18 76.92 23.02 90.18 7.27 42.16 97.35
KV-7a -1/4" Head KV-9 -1/4" Head KV-9a -1/4" Head KV-10 Top -1/4" Head KV-10 Bottom -1/4" Head KV-15a -1/4" Head KV-15b -1/4" Head
Cyanide Leach Test Cut Calc. Recovery opt 0.043 0.102 0.062 0.082 0.077 0.031 0.029 0.004 0.124 0.010 0.056 0.029 0.057 0.013 0.009 0.002 0.014 0.147 0.048 0.179 0.128 0.050 0.020 0.010 0.055 0.058 0.045 0.058 0.1015
w'ted aves
Fire Assay Cut Recovery % 49.28 57.92 47.89 60.77 61.65 67.33 57.53 57.97 KV-11 -1/4" Head 0.0932 0.0533 0.0389 64.66 0.025 0.099 0.138 15.18 0.025 0.043 41.38 0.021 12.25 0.069 0.094 1.45 0.001 0.094 5.31 0.005 6.77 37.84 0.020 KV-5 -1/4" Head 0.069 0.087 19.16 0.017 0.037 53.60 0.020 10.00 0.069 0.094 0.80 0.001 0.094 9.59 0.009 10.39 51.33 0.048 KV-1 -1/4" Head 0.206 0.235 19.65 0.046 0.087 42.20 0.037 6.80 0.206 0.235 7.44 0.017 0.235 17.16 0.040 24.60 0.058 0.010 0.006 0.041 0.055 5.30 0.003 0.007 17.10 0.001 9.50 0.206 0.542 1.67 0.009 0.542 30.60 0.166 32.27 0.175 0.058 0.542 0.235 0.094 0.094 61.57 4.86 10.35 53.38 0.334 0.011 0.010 0.050 0.056 KV-12 -1/4" Head 0.054 0.045 20.33 0.009 0.016 29.60 0.005 2.00 0.058 KV-15a -1/4" Head 0.160 0.242 24.02 0.078 0.102 62.10 0.065 12.00 0.099 KV-10 Top -1/4" Head 0.086 0.132 18.49 0.025 0.044 50.85 0.022 12.00 0.081 KV-9 -1/4" Head 0.116 0.240 13.31 0.033 0.047 42.84 0.022 24.20 0.131 0.065 0.89 0.001 0.065 12.29 0.008 13.18 0.009 0.065 0.058 KV-7 -1/4" Head 0.077 0.083 10.11 0.008 0.036 53.18 0.021 21.00 23.23 0.015 0.088 KV-8 -1/4" Head 0.100 0.156 13.31 0.021 0.023 23.00 0.005 13.00 0.051 KV-6 -1/4" Head 0.084 0.102 8.14 0.008 0.033 39.30 0.013 12.00 opt Rec'd Au Sample No. opt opt Rec % Rec opt opt Rec % Rec opt ft. Au opt opt Rec % Rec opt opt Rec % Rec opt Rec % Rec opt opt Rec % Rec opt Cut Apex Calc Hd Calc Hd length Calc Hd Calc Hd Calc Hd Rec'd Au opt 0.051 0.088 0.057 0.081 0.100 0.062 0.058 0.002 0.068 0.016 0.048 0.021 0.029 0.019 0.011 0.023 0.008 0.073 0.033 0.090 0.064 0.025 0.010 0.005 0.043 0.063 0.046 0.036 56.93 0.058 0.0277 46.32 0.013 0.0649 49.23 0.032 0.0932 48.38 0.045 0.0469 67.10 0.031 0.0760 48.68 0.037 Composites Above 0.0998 0.0965 0.0862 0.1600 0.1328 0.1210 0.1516 0.1036 opt Ave US-LM rec Au Head
Gravity Concentration
Cyanide Tests
Fire Assay
Gravity Concentration
Flotation Tests
Gr-Fl Combined
Cyanide Tests
Gr-Fl-Cyan Combined ID and Notes Rec% Rec opt
Fire Assay
Calc.
Calc.
Sample 0.1022
opt
Head,
Recovery,
Rec'd Au
Head,
Recovery,
Rec'd Au
Apex Samples
width
Apex
none
opt
%
opt
opt
%
opt
ft.
K1-P1&2
0.105
56.3
0.059
0.085
13.1
0.011
Kl 1A, 1B, 1C
25
K2-P
0.130
57.0
0.074
0.141
39.7
0.056
Kl 2A, 2B
25
K3-P
0.103
51.2
0.053
0.093
12.7
0.012
Kl 3A, 3B, 3C
22
K4-P
0.131
60.2
0.079
0.107
7.2
0.008
Kl 4A, 4B, 4C
26
33.35
0.022
KV-9 [-10 Mesh]
K5-P
0.181
67.9
0.123
0.128
16.7
0.021
Kl 5A, 5B, 5C
20
K6-P
0.115
80.0
0.092
0.064
23.5
0.015
Kl 6A, 6B, 6C
13
K7-P
0.109
80.6
0.088
0.108
39.0
0.042
Kl 7A, 7B,7C
17
K8-P
0.018
0.0
0.000
0.021
56.3
0.012
Kl 8A, 8B, 8C, 8D
28
K9-P
0.021
0.0
0.000
0.026
44.6
0.012
Kl 9A,9B,9C,9D,9E,9F
24
K10-P
0.036
61.0
0.022
0.032
21.3
0.007
Kl 10A, 10B
24
73.97 28.43 19.96 56.54
0.401 0.067 0.019 0.053
KV-1 #2 [-10 Mesh]
K11-P
0.076
51.6
0.039
0.076
8.7
0.007
Kl 11A, 11B, 11C
14
KV-1 #4 [Grind 20 Min.]
K12-P
0.046
28.5
0.013
0.042
10.7
0.004
Kl 12A, 12B, 12C
14
KV-5 #3 [-10 mesh]
K13-P
0.001
0.0
0.000
0.004
52.4
0.002
Kl 13A, 13B, 13C
29
KV-5 #1 [Grind 20 min.]
K14-P
0.078
33.5
0.026
0.077
16.6
0.013
Kl 14A, 14B, 14C
25
K15-P
0.024
54.4
0.013
0.005
62.7
0.003
Kl 15A, 15B, 15C
21
K16-P 0.151 0.0637 0.1853 0.1297 0.0543 0.0235 0.0236 0.0859 59.82 40.74 87.22 92.64 98.46 96.76 74.90
0.067
65.5
0.044
0.059
22.0
0.013
Kl 16A, 16B, 16C
24
K17&18-P
0.018
19.0
0.003
0.015
18.9
0.003
Kl17A,17B,17C,17D,17E,17F
23
K19-P
0.001
0.0
0.000
0.000
100.0
0.000
Kl 18A, 18B, 18C
18
K20-P
0.030
59.3
0.018
0.031
4.3
0.001
Kl 19A, 19B, 19C
17
K21-P
0.001
0.0
0.000
0.001
5.5
0.000
Kl 20A, 20B, 20C
16
K22-P
0.000
0.0
0.000
Lost
0.0
0.000
Kl 21A, 21B, 21C
24
K23-P
0.001
0.0
0.000
0.000
0.0
0.000
Kl 22A, 22B, 22C
16
K24-P
0.000
0.0
0.000
0.000
0.0
0.000
Kl 23A, 23B, 23C
13
K25-P
0.001
0.0
0.000
0.000
100.0
0.000
Kl 32A, 32B, 33C
16
0.054
34.4
0.031
0.048
28.2
0.010
Averages
20.58
0.058
Klamath Gr.
0.022
Dariel Gr.
0.015
Ridge Gr.
All Cyanide Leach Test Calc. Fire Assay opt none 0.1881 0.069 0.307 0.0322 0.1229 0.0805 0.0851 0.1268 0.1666 Fire Assay Other Sample No. KV-13 -1/4" Head KV-14 -1/4" Head 0.039 KV-2 -1/4" Head KV-3 -1/4" Head KV-4 -1/4" Head 0.063 Six O'C-1 -1/4" Head Six O'C-2 -1/4" Head Six O'C-3 -1/4" Head Six O'C-4 -1/4" Head Six O'C-5 -1/4" Head 0.000 YD-1a -1/8" Head YD-1a-2 -1/8" Head YD-1b-1 -1/8" Head YD-1.b-2 -1/8" Head YD-1c-1 -1/8" Head YD-1d-1 -1/8" Head YD-1d-2 -1/8" Head 0.197 BS-1 -1/8" 7-27-98 BS-2 -1/8" 7-27-98 BS-3 -1/8" 7-27-98 BS-4 -1/8" 7-27-98 BS-5 -1/8" 7-27-98 BS-6 -1/8" 7-27-98 0.254 0.395 0.228 0.330 0.222 0.135 0.163 0.138 0.186 0.191 0.449 0.120 0.079 15.52 44.89 22.68 24.69 14.83 24.59 24.13 0.145 0.119 21.73 0.045 64.53 0.000 0.019 76.63 0.015 0.041 0.026 0.012 0.202 0.042 0.040 0.034 0.081 0.062 0.013 0.005 0.007 0.009 0.029 0.085 0.068 0.031 0.031 9.00 42.00 3.70 6.50 21.50 28.10 26.80 19.66 19.50 0.001 0.002 0.000 0.001 0.006 0.024 0.018 0.007 0.006 0.122 0.136 0.186 0.177 4.29 3.18 0.127 0.125 0.182 0.184 3.84 4.05 0.145 0.145 0.218 0.166 1.36 1.98 0.000 0.014 73.79 0.010 0.000 0.184 97.12 0.179 0.000 0.003 43.01 0.001 0.000 0.003 32.12 0.001 0.073 24.48 0.018 0.030 0.043 0.047 16.96 0.008 0.022 51.20 46.93 0.021 0.024 29.72 0.007 0.009 42.80 0.124 0.149 26.75 0.040 0.058 46.80 0.020 5.70 0.001 0.017 38.10 0.008 0.027 0.004 0.011 0.014 0.124 0.124 0.177 0.161 15.13 2.46 0.023 0.025 7.10 0.002 0.006 26.10 0.002 0.055 0.015 4.29 0.001 0.028 50.10 0.014 Au opt opt Rec % Rec opt opt Rec % Rec opt Calc Hd Calc Hd Au opt 0.055 Gravity Concentration Cyanide Tests 37.38 0.073 Fire Assay Gravity Concentration Calc Hd opt 0.072 Rec % 5.25 28.70 0.049 0.046 0.1357 45.54 0.062 0.142 0.219 31.264 0.057 0.022 10.014 0.004 29.52 0.025 0.030 KD-8 Head 0.053 0.204 16.72 0.034 0.003 5.70 0.000 25.44 0.020 0.027 KD-2 Head 0.441 0.303 22.70 0.069 0.099 22.40 0.022 43.03 0.053 0.043 0.1010 42.97 0.043 KD-1 Head 0.173 0.278 19.65 0.055 0.008 4.60 0.000 12.96 0.004 0.007 BS-1 -1/8" 7-27-98 0.159 0.409 18.65 0.076 0.031 19.50 0.006 77.2 0.237 0.138 0.1885 66.60 0.126 KD-5 Head 0.057 0.092 55.36 0.051 0.004 7.00 0.000 4.29 0.003 0.029 0.0805 31.90 0.026 KD-7 Head 0.055 0.132 74.74 0.099 0.003 5.50 0.000 6.42 0.012 0.055 0.1731 33.91 0.059 KD-4 Head 0.055 0.115 11.03 0.013 0.003 5.40 0.000 0.1299 30.72 0.040 0.040 0.1200 47.31 0.057 opt % opt opt opt % opt Sample No. Au opt opt Rec % Rec opt opt Rec % Rec opt Head Recovery Rec'd Au Ave US-LM rec Au Head Recovery Rec'd Au Dump Calc Hd Calc Hd Cut Calc. Cut Cut Fire Assay Gravity Concentration Cyanide Tests
Case 1:95-cv-00650-LSM
Mined Cut Apex
Cyanide Leach Test
Flotation Test
Sample
Fire Assay
Calc.
Calc.
Dump Samples
Dumps
opt
Head,
Recovery,
Rec'd Au
Head,
Recovery,
Rec'd Au
D1-P
none
0.138
9.5
0.013
0.110
63.9
0.070
Kd 24A, 24B, 24C
D2-P
0.114
3.8
0.004
0.158
61.4
0.097
Kd 25A, 25B, 25C
D3-P
0.140
9.4
0.013
0.092
59.5
0.055
Kd 26A, 26B, 26C
D4-P
0.066
6.6
0.004
0.070
56.0
0.039
Kd 27A, 27B, 27C
D5-P
0.043
30.4
0.013
0.040
26.4
0.011
Kd 28A, 28B, 28C
D6-P
0.039
11.1
0.004
0.079
42.9
0.034
Kd 29A, 29B, 29C
D7-P
0.057
0.0
0.000
0.066
49.9
0.033
Kd 30A, 30B, 30C
D8-P
0.076
5.7
0.004
0.059
57.7
0.034
Kd 31A, 31B, 31C
0.084
9.6
0.007
0.084
52.2
0.047
Averages
Looks like dump flotation and cyanide test results reversed!
Mined Cut - Dumps Flotation Tests Calc Hd Rec opt 0.004 opt 0.072 Rec % 8.62 Rec opt 0.006 Rec % 13.87 Rec opt 0.010 Gr-Fl Combined Cyanide Tests Calc Hd opt 0.072 Rec % 12.65 Rec opt 0.009 Rec% 24.76 Rec opt 0.018 Gr-Fl-Cyan Combined
KV-13 [-10 Mesh]
0.027 0.004
0.177 0.161
12.97 7.54
0.023 0.012
28.10 10.00
0.050 0.016
0.177 0.161
16.76 31.84
0.030 0.051
40.15 38.66
0.071 0.062
KV-2 #3 [-10 mesh]
Document 118-19
KV-2 #2 [Grind 20 min.]
0.003 0.003 0.007 0.007 0.007 0.006
0.218 0.166 0.182 0.184 0.186 0.177
43.42 31.67 17.92 16.39 17.62 18.36
0.095 0.053 0.042 0.040 0.044 0.038
44.79 33.65 21.76 20.44 21.91 21.54
0.098 0.056 0.049 0.048 0.051 0.044
0.218 0.166
22.39
0.049
58.55 NA = cyanide tail assay > float tail assay
0.128
YD-1a-1 [Grind 20 Min.]
YD-1a-2 [-10 Mesh] All 10 0.184 0.186 0.177 26.34 24.91 28.12 0.062 0.018 0.079 0.040 38.44 45.55 0.106 0.077 41.60 0.093 USFS -10m Gr 20 min
9 with Cyan Results
0.159 0.059 0.074 0.040 0.039 0.031 0.067 0.034 0.054 0.027 0.036 0.038
0.409 0.099 0.221 0.093 0.048 0.168 0.173 0.112 0.058 0.065 0.078
18.65 13.03 14.07 14.41 10.10 27.54 16.30 10.36 25.10 9.18 14.88
0.076 0.013 0.031 0.013 0.005 0.046 0.031 0.012 0.015 0.006 0.011
Missing Data
Revised Liberty Spreadsheets, 02/07 Sheet 09
Union-1 -1/8" 8-12-98 Union-2 -1/8" 8-12-98 Union-3 -1/8" 8-12-98 Union-A -1/8" 8-12-98
Filed 02/06/2008 Page 10 of 12
PE-18-259
USFS 1998 - Gravity split test sample Crush -10m*
"some"
Liberty 1998 - gravity/floation/cyanide (in series) fire assay sample prep assay Pulverize in ball mill for 20 min. rejects con assay rejects pan
split
fire assay sample
test sample
prep
crush vein material -1/4" crush dump material -1/8" pan con sample assay
assay
gold saver
con
tail
crush to -10m*
knelson bowl
sample
con
tail
assay
pulverize
crush -10m*
flotation Denver 1000gr cell Two dithiophosphate collectors Am. Cyanamid 404 and 206 Glycol Frother 65 Each at 0.15lb/T Nat. pH 7.6 to 8.3 condition slurry 3 or 6 minute float (longer for more carbo) cons filter dry sample assay assay 500 gr sample 500 ml water 8 lb CaOH 1 hr. grind in ball mill to -100m dilute to 33% solids add 4 lb/T NaCN add 3gr. Of 6x16 activated carbon agitate 24 hours sample Cyanide Leach dry filter tails
Case 1:95-cv-00650-LSM
*2 mm or 0.08"
sample
sample
flotation Denver 1000gr cell Two dithiophosphate collectors Am. Cyanamid 404 and 206 Glycol Frother 65 Each at 0.15lb/T Nat. pH 7.6 to 8.3 condition slurry 3 or 6 minute float (longer for more carbo) cons filter dry sample assay tails filter, dry dry sample assay Average recovery 18.36% rec/0.0
assay
assay
Recoveries 4.29% to 97.12% Recovery average 26.06% rec/0.039 opt Average 0.087opt assay head and 0.149 opt calc. head - assay too base Average 0.000 opt assay head and 0.045 opt calc. head from 6 O'clock apex - assay too base 95% of recovered gold from Gold Saver and 5% from Knelson Bowl Low amalgamation recovery from 5 samples tested interpreted as no free gold. What about 26.6% average grav recovery?
Document 118-19
USFS 1998 Cyanide Leach No further prep reported. Leached -1/4" vein and -1/8" dump material
Apex recoveries 17.1% to 73.7% Dump recoveries 3.7% to 28.1% Overall average recovery 26.53%/0.009 opt Average 0.102 opt assay head and 0.029 calc. head - preg rob Carbon-in-pulp (CIP) test shows increased CN recovery = ave. recovery doubled for 3 samples
Average recovery 17.72%/0.044 opt
Filed 02/06/2008
Revised Liberty Spreadsheets, 02/07 Sheet 11a
remove activated carbon filter and wash Gravity recovery 0.80% to 15.13% (ave. 4.05%/0.007 op dry Flotation recovery 5.31% to 30.60% (ave. 16.39%/0.040 Cyanide recovery 4.86% to 61.57% (ave. 26.34%/0.062 sample Gr./Fl./CN average assay head 0.125 opt and calc. head Gr./Fl./CN -10m recovery average 38.44%/0.0.106 opt assay Gr./Fl./CN grind. 20 min. recovery average 45.55% rec/0 Gr./Fl./CN all recovery 19.96% to 73.97% Gr./Fl./CN all recovery average 41.6% /0.093 opt
Page 11 of 12
PE-18-260
USFS 2005 - Cyanide and Flotation (in parallel) No head fire assay Crush to 100% -1/2" Cyanide Leach Split to 1000 grams Screen 10m Flotation Grind P80 65m Ball mill to -100m pan con tail sample assay assay repulp to 35% solids filtrate cake wash with 250 ml water wash filtrate cake dry measure total filtrate condition for 2 min. 100 ml alquot to assay float for 5 min hand held paddle and water wash con filter dry Cyanide Leach sample assay dry filter tails assay sample sample filter filter (1 gal pressure filter) rejects add 2 gr. NaCN agitate for 24 hrs. (mechanical agitator speed set for adequate aeration) Sulfide Float Natural pH PAX Aero31 25% solids con sample assay Flotation Denver 1000 cell copper sulfate sulfide activator potassium xanthate sulfide collector Aerofloat 25 sulfide/metal collector Aerofloat 71 frother mix for 5 min. Cone cr to -6m Pulverize to -10m add 2 gr. Of CaOH to raise pH above 10.5 -10m +10m agitate slurry in 1.5 qt. plastic pail 500 gram sample of float tail repulped to 50% solids or 500 gram sample of ground whole ore
Liberty 2004 - Gravity-Flotation-Cyanide Cyanide only and
No head fire assay
Crush -1/4"
Crush -10m*
Split
Cyanide Leach
Grind P80 65m
Leach Lime to pH 11.0 NaCN @ 2.0 lb/T 50% solids
Case 1:95-cv-00650-LSM
preg
residue
sample
sample
assay
assay
"preg robbing" cited in report Apex recovery 0.0% to 80.6 % w_7 ND (6 from ridge) Dump recovery 0% to 30.4 % Apex recovery average 34%/0.031 opt Dump recovery average 9.6% rec/0.007 opt Apex recovery 4.2% to 62.7 % with 5 from ridge ND Dump recovery 26.4% to 63.9 % Apex recovery average 32.2% rec/0.010 opt Dump recovery average 52.2% rec/0.047 opt
[are dumps results reversed or severe preg robbing in dump samples?]
Liberty 2006 Bulk Milling
Document 118-19
combine 3 apex samples and 3 dump samples into 2 10+/- ton composites run dump and apex separately
jaw crush to -1/2" (2nd run through for apex samples)
5 samples gr-fl-cn Gravity recovery 0.26% to 39.97%, ave. 10.52% Flotation recovery 0.04% to 9.54%, ave. 6.47% CN leach recovery 42.25% to 61.23%, ave. 52.48% Average calc. head 0.141 opt KV-5 calc head 0.262 opt and grav rec 39.97% KV-1 calc head 0.076 opt and grav rec 0.55%
ball mill
wash ground material through 30 m screen
-30m
+30m
Revised Liberty Spreadsheets, 02/07 Sheet 11b
carpet
screw feed back to ball mill
32 samples CN only Apex recovery average 59.82% and calc head 0.0859 opt Apex recovery 7.27% to 97.35% Apex calc head 0.0102 opt to 0.1736 op Dump recovery average 37.38% and calc head 0.1666 opt Dump recovery 4.27% to 77.20% Dump calc head 0.0322 opt to 0.3070 opt
Knelson bowl
con
tail
clean-up after both dump and apex complete
Filed 02/06/2008
Wilfley table
dry
Wilfley table
con
split
con
dry
assay
dry
split
split
Dump pretest calculated heads 0.1870 opt Dump Assayed Heads 0.079 opt Dump Calculated Heads 0.0756 opt Dump Assayed Tails: 0.069 Dump Calculated Tails 0.0693 opt Dump Knelson con + 1/3 cleanup con 0.0063 opt Dump Recovery Knelson con + 1/3 cleanup con vs. assayed head 8.0% Dump Recovery Knelson con + 1/3 cleanup con vs. calculated head 8.3% Dump Recovery Knelson con + 1/3 cleanup con vs. pretest head 3.4%
Apex pretest calculated heads 0.1550 opt Apex Assayed Heads 0.025 opt Apex Calculated Heads 0.0115 opt Apex Assayed Tails: 0.005 Apex Calculated Tails 0.005 opt Apex Knelson con + 1/3 cleanup con 0.0065 opt Apex Recovery Knelson con + 1/3 cleanup con vs. assayed head 26.0% Apex Recovery Knelson con + 1/3 cleanup con vs. calculated head 56.2% Apex Recovery Knelson con + 1/3 cleanup con vs. pretest head 4.2% Overgrind makes fine gold out of some of the coarse, and carbo slimes that carry off fine gold and foul assays.
Page 12 of 12
assay
assay (2/3 to dumps and 1/3 to apex)
PE-18-261