New
Mexico
Bureauof Mines and Mineral Resources
Open File Report #
307
Column Leach Testing of Gold Ore from
the Ortiz goldmine:
The effect of surfactant additions to
the leaching solution.
Michael J. Harris
Metallurgist
New Mexico Bureauof Mines
and Mineral Resources
September 1987
Abstract
Five
column
leaching
tests
were
carried
out
to
determine
the
ppn) to
effects of adding various surfactants (at a level15 of
the cyanide leaching solution,
on the extraction of gold from
ore taken from the Ortiz gold mine, located near Cerrillos,
N.M.
Based
on
this
significant
ore.
test
effect
work
on
the
surfactant
over all
the
additions
extraction
of
did
gold
not
from
have
the
a
Introduction
This
open
file
report
is
based
on
work
carried
out
for
the
Ortiz
to February 1985.
gold mine during the period of October 1984
The
Ortiz
gold
the
materials
mine
(owned
needed
for
by
this
Consolidated
Gold
Fields)
provided
study.
Summary
1.
The ore as received had been crushed to
100 percent parsing
1 inch. The material was moderately damp with
an 8.3 percent
moisture. Triplicate fire assays yielded a head analysis
of
0.02 troy ounces of gold per ton of ore.
2.
The cyanide leaching solution contained
1 gram per liter
sodium
cyanide
at
a
pH 11.8
of with a
residual
gold
concentration of 0.086 ppm (0.0025 oz/ton
of solution).
3.
Five column leaching tests were carried out to test the
effects of various surfactants on the extraction of gold. The
surfactants
Column
1
2
3
4
5
tested
and
the
extraction
Surfactant
None
1.0602
Nalco 2DA-375
Nalco 7811-V1179
Nalco 3DA-78s
Nalco 8801-B3159
results
are
shown
Gold Extracted.
(mg Au/ Kg of ore)
1.0181
1.0320
1.0350
1.0502
below:
4.
The extraction rate of gold as a function of effluent flow
rate
was
determined
to
be
a
constant
during
the
initial
portion
of each of the five column leaching tests. This constant value
was 5 . 0 0 mg of gold per liter of leaching solution.
5.
The quantity of gold dissolved in solution was found to peak
early in the test and declined there after. This peak in the
concentration
to
occur
the
6.
of
dissolved
between
column
the
5th
gold
and
in
8th
the
leaching
liter
of
solution
effluent
for
was
each
found
of
tests.
In each of the fivetests, 90 percent (or better) of the
gold
was
extracted
with
the
first
2 0 liters of leaching
solution.
7.
Based on these results the surfactant additions had little
if any, effect on the extraction of the gold at a surfactart
addition of 15 ppm.
Discussion
Ore
Description:
The
gold
ore
used
in
this
test
work
was
provided by the Ortiz gold mine. The sample consisted of about
750 pounds of wet material contained in55a gallon drum. A
head
sample
was
split
out
€rom
the
bulk
sample
for
prelimicary
analysis. Tests were carried out on the head sample to
determine
gold
content,
percent
moisture
and
particle
size
distribution. The results are shown below:
Gold Content (triplicate fire assay) 0.02 oz/ton
Percent Moisture (air dry)
8.3
Particle
Size
Distribution
Cumulative
Passing
Percent
Weight
Mesh
Tyler
1 inch
3/4 inch
1/2 inch
4 m
10 m
20 m
28 m
35 m
48 m
65 m
100.0
99.7
91.7
45.6
30.1
20.7
17.2
13.3
9.8
5.0
0.9
100 rn
Leaching Solution: The leaching solution as provided by Ortiz
consisted of approximately 110 gallons of one
sodium
cyanide
gram
per
with a residual gold
solution, 11.8,
pH
concentration of 0.086 ppm ( 0 , 0 0 2 5 oz/ton of solution).
solution
was
liter
modified
for the
test
work
by the
addition
Tfis
of
the
surfactants, which werealso provided by Ortiz. Each surfe.ctant
was added at a rate
of 15 ppm by weight. The surfactant
w e d in
each
test
is
shown
below:
Test
1
2
3
4
5
Surfactant
None (control)
Nalco 2DA-375
Nalco 7811-V1179
Nalco 3DA-785
Nalco 8801-B3159
Bulk
samples
of
each
five
gallons
of
the
leaching
cyanide
solution
solution
were
with
prepared
enough
by
mixing
surfactant
to
make the designated1 5 ppm concentration. The bulk solutions
were
stored
needed
in
each
stoppered
five
gallon
containers
and
used
as
day.
Column Desoription: Five columns were used in this test work.
Each column consisted of a ten foot long,
6 inch ID, schedule 40
PVC pipe. On the bottom of each column6 a
inch schedule 40 PVC
cap was installed to contain the in
orethe column. Each cap
was
drilled
and
fitted
with
a
short
length
of PVC
1/2 inch
tubing to allow the leaching solution to flow out of the
column. Inside the cap a small wad of glass wool was placed
over the exit hole. The glass
wool was held in place by
a
section
of
screen
which
was
laid
over
the
gilledthen
in
and
wool
place with PVC solvent. This arrangement allowed the solution
to flow
The
out
columns
of
the
were
floor
and
the
floor
tailing
column
mounted
tops
with
of
while
on
the
metal
a
retaining
wooden 14
frame
inches
columns
straps
the
were
and
ore
particle?.
above
the
to the sec0r.d
secured
screws.
55 gallor drum
Column Loading Procedure: Ore was taken from the
by
shovelfuls
and
placed
sequentially
into
one
of
five
numbered
buckets (one bucket for each column). After every three rcunds
a
shovelful
was
placed
into
a
sixth
bucket
to
serve
as
a
head
sample, When the ore buckets were filled they were weighed and
the contents were loaded into the respective columns. After
loading
the
ore
contained
in the
columns
varied
in
height
between 7.5 and 8 feet.
Leaching procedure: Approximately two liters of leaching
solution was introduced into each column each day. The
solutions
were
held
in
two
liter
flasks
which
were
suspended
above the columns in
a rack which was attached to the ceiling.
The solution flowed out of the flask through tubing and into the
column. The flow rate was regulated by
a screw clamp on the
tubing. By tightening the clamp the solution flow rate was
decreased.
Each
day
the
flasks
were
filled
and
the
column
effluents
were
collected. Each effluent sample was weighed and portions vere
taken for cyanide,
pH and dissolved gold determinations. The
bulk effluent sample was then disposed of after the residuF.1
cyanide
had
been
destroyed
with
sodium
The columns were leached for
42 days,
hypochlorite.
drained
for
two
days,
washed with two liters of water, drained fordays,
five waphed,
drained for five days and washed
a final time. The columnr were
then
drained
for
seven
days
after
which
the
leached
residues
were removed and air dried for several days. The residues were
then
split
into
quarters
and
a fire
assay
sample
was
split
from each quarter, the bulk residues were then stored.
Test Results: The test results are summarized in Table
I and
out
Figures 1-4.
A complete listing of the leaching test data for
each
column
is
From
these
presented
results
there
in
the
would
appendix.
seem
to
be
little
to
differentiate these tests. Figure 1 shows gold extraction
(based on percent) as a function of effluent flow. The data are
grouped
in
difference
a
at
Figure 2 shows
narrow
any
band
without
8 percent
than
an
more
time.
gold
extraction
(in
milligrams)
as a function of
15 liters of each test. The most
effluent flow for the initial
interesting feature of these results is the linear aspect of the
extraction between 2 liters and 11 liters.
A least squares fit
of these results gave an equation =of5.00
y (X)
coefficient of fit of
0.98.
good,
again
indicating
-
11.20 rlith a
The coefficient of fit is very
that
there
was
little
difference
between
the five tests. The slope of the line gives
a value for tk.e
rate of extraction during the initial stage of the test. The
value of 5 . 0 0 mg of gold per liter of solution is equivalert to
0.146 oz of
gold per ton of solution.
Figure 3 shows the concentration of dissolved gold as a furction
of effluent flow rate.Of primary interest is that the amcunt
of
and
gold
then
in
solution
declined
reached
gradually
a
peak
through
very
out
early
the
rest
in
the
of
test
the
This peak occurred between
5 and 8 liters total effluent flow,
which
corresponds
to
between
6.7 and 10.8 gallons
effluent
per
work
time.
square
.
foot
The only real difference in these results is shown in 4Figure
which presents total gold extraction (mg) a as
function of
effluent flow. Yet even this difference is only
a function of
the weight of ore placed in the column. Column
4 yielded the
lowest
overall
extraction
and
had
the
lowest
total
weight
of
ore. Column 5 yielded the highest overall extraction and had
the highest total weight. The ratio
of gold extracted (mg) to
total
weight
of
ore
was
calculated
to
overcome
the
effect
of
different weights of ore in each test. The results are shown
below:
Column
Gold
Surfactant
Extracted
of ore)
( m g Au/ Kg
None
1.0181
2DA-375
Nalco
7811-Vl179
Nalco
1.0320
3DA-78s
Nalco
Nalco 8801-B3159
1.0502
1.0350
1.0502
These results vary (lowest to highest) by only 3 percent,
c.gain
indicating very little difference in the test results,
Finally using the total amount
o f gold
calculate
a
head
Column
1
2
3
assay
gave
the
dissolved
following
in
each
results.
Calculated Head
(oz/ton)
0.0306
0.0297
0.0301
0.0302
0.0306
Assay
test
to
the
These
results
0.02 oz/ton,
are
somewhat
higher
than
the
fire
assay
result
but still within experimental limits.
Therefore it is the conclusion of this study that the use of
the
various
significantly
surfactants
effect
the Ortiz ore.
the
at
a
ppm did not
level1 5 of
extraction
of gold
from
this
sample
of
of
Summary
of
Table 1
Column Leaching
Results
Column
Test
Number
1
2
3
4
5
62.007
59.185
61.569
58.293
64.038
Effluent flow (liters) 8 4 . 2
72.2
80.8
77.7
79 .O
Cyanide consumed (gms) 28.698
27.044
28.396
27.941
28.766
Feed Weight (wet,
kg)
64.004
62.943
64.601
60.985
66.024
Feed Weight (dry, kg)
59.110
58.130
59.661
56.322
60.975
Gold
Extracted (mg)
Gold Extraction
mg Au/liter
mg Au/kg of ore
Calculated Head
(oz/ton)
0.7371
1.0502
0.8197
1.0181
0.0306
0 .00.02
0.09
3
0.7
0
31
0
32
06
0.00
0.00
0.00
0.00
trace
trace
trace
trace
0.7612
1.0320
0.7495
1.0350
0.8103
1.0502
0.00
trace
trace
trace
trace
trace
trace
Assay
Leached Residue
Assays (oz/ton)
1
2
3
4
trace
less than 0.01 oz/ton
0.02
0.00
0.02 trace
trace
I
!
11
i.l
a
3
a
0
0
I-
I
Figure 3
D i s s o l v e d Gold C o n c e n t r a t i o n a s
F u n c t i ooT
nfo t aElf f l u e n t
'3r
a
A
I
0
0
0
0
2
3
4
5
I
i
0
V
0
"
0
0
1
0
I
I
I
2
3
4
5
6
FTFL.!!FNT
7
8
9
FI O W (Ii t o r s )
IO
II
I2
13
14
I
15
64-
63 6261
-
60
-
- 59CT
E
z 58 -
v
0
-
57Q
E
tX
W
0
56-
55
-
_I
0
w 54-
5352
V
3
4
0
5
0
515049 1
0
I
IO
I
20
I
I
I
30
40
50
EFFLUENT FLOW ( l i t e r s )
I
I
60
70
APPENDIX
I
Column 1
- Control
sumrnvy of Leaching Data
Date
.
11/ 8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
12/ 1
2
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
21
26
1/2/05
(g)
SampleSampleWelght
NO.
Individual
cumulative
803
2618
4260
6570
Extraction
Gold
Gold
(ug)
(ppm) Individual
Cumulative
53694
55147
55014
56543
57201
57604
57949
93223
58419
58790
550
625
690
665
670
700
750
725
760
700
392
255
209
134
289
198
40
97
74
59102
59437
59616
59780
GO069
60267
60307
60404
60178
60536
800
2176
1959
1492
960
2220
2208
1324
1933
2482
1930
39485
41444
42936
43896
46116
48324
49648
51581
54063
55993
0.13
0.14
0.14
0.13
0.09
0.03
0.05
0.03
0.03
131
132
133
134
135
136
137
138
139
140
2041
2026
2008
2106
2002
1671
2328
58034
0.04
"60
0.02
0.04
0.06
2391
2070
62068
64174
66176
67847
70175
71981
74372
76442
111
142
143
141
2092
1809
2166
1709
78534
80343
82509
81218
0.05
0.05
0.04
0.00
1806
1094
1149
1312
1219
919
1177
2046
1169
1453
667
729
658
403
345
274
196
377
121
122
123
124
125
126
127
128
129
130
118
180
0.8
0.8
119
120
117
1601
200
300
375
425
445
475
19736
21552
23457
25429
27648
29088
31385
33490
35450
37309
116
25
402
2217
9770
21320
28500
36180
41846
45971
49364
52025
2086
1816
1905
1972
2269
1390
2297
2105
1960
1859
111
112
113
114
115
8Offi
787
1779
20
402
1815
7553
11550
7180
7688
5658
4125
3393
2661
9881
11832
13482
15603
17650
102
103
104
105
106
107
108
109
110
M
<0.5
1.0
4.6
5.0
5.0
4.1
2.9
2.5
1.6
1.3
803
1815
1642
2310
1436
1875
1951
1650
2121
2047
101
Effluent
Cyanide (w)
per liter Consumed Cumulative
0.35
0.37
0.29
0.29
0.15
0.13
0.10
0.20
0.18
0.06
.05
.05
.05
.05
.04
58
775
770
705
725
660
750
810
795
805
126
120
60618
60658
60738
60864
60984
e4
61OG8
780
116
90
120
83
61184
61274
61394
61477
8h)
860
875
865
105
235
260
61582
61817
62077
62077
775
810
300
75
82
40
80
-
850
800
825
800
800
707
2566
4167
6061
7210
8522
9711
10690
11067
13913
@I
8.1
8.1
8.2
8.2
8.4
8.9
9.3
9.5
9.8
10.1
14852
15533
16121
16785
17531
17951
10525
19104
19574
20132
10.5
10.5
10.0
10.6
10.5
751
331
367
509
376
20567
21m
21351
21634
22245
22996
23327
23694
21203
24579
10.7
10.7
10.5
10.5
10.4
10.3
10.1
10.5
10.4
10.5
306
405
351
421
400
360
466
253
2'39
279
21805
25290
25641
26062
26,162
26030
27236
27519
27848
281
27
10.6
10.6
10.6
10.6
10.7
471
28590
9.9
10.1
9.7
9.4
939
681
591
661
719
417
574
579
470
558
435
"1
343
283
611
10.0
10.1
10.3
10.4
10.5
10.8
10.5
10.5
10.5
10.5
,diumn 2
smry
11f 8
9
10
11
12
13
14
15
16
17
18
19
21
20
22
23
24
26
25
27
28
29
30
12/ 1
2
4
5
6
7
8
9
15
16
17
18
19
21
26
1/2/05
246
1950
3244
5165
6935
7999
8616
10899
11752
13503
a
5
-
SurTactant L u ~ - 3 / 5
of Leaching Data
123
852
3235
9605
9558
6171
3208
201
?02
203
201
205
206
207
208
209
210
246
1704
1294
1921
1770
1064
617
2283
853
1751
211
212
213
214
215
216
217
218
219
220
2230
760
2799
1173
845
1715
2080
799
2096
13503
15733
16493
19292
20465
21310
23025
25105
25904
280M)
1.6
0.87
0.57
0.41
0.40
0.25
0.17
0.25
0.24
3560
662
1595
481
338
429
354
200
503
221
222
223
224
225
226
227
228
229
230
2000
2292
704
835
2093
2096
1865
1905
1880
2190
30000
32292
32996
33831
35924
38020
39885
41790
43670
45860
0.21
0.12
0.12
0.14
0.12
0.11
0.07
0.09
0.03
0.05
4 20
275
84
117
251
231
130
171
57
231
232
233
234
235
236
237
238
239
240
1272
2235
2020
1636
2017
2294
614
2629
1968
1933
47132
49367
51387
53023
55070
57364
57978
60607
62575
€4408
0.05
0.05
0.07
0.08
0.07
0.06
0.05
0.05
0.04
0.04
63
112
141
131
143
138
31
241
24 2
243
214
2363
66771
68617
70637
72196
0.05
0.05
0.03
0.00
-
1846
2020
1559
<O. 5
2.5
5.0
5.4
5.8
5.2
3.9
2.8
2.2
-
8904
2380
3052
”
110
131
79
73
118
92
61
123
975
4210
13815
23373
29544
32752
41656
44044
47896
15
20
30
90
175
200
225
NO
280
310
242
1670
1259
1718
J1
G
o
851
479
1598
GI 4
12011
;
:12
1912
3167
4C)l 5
6375
7226
7705
3303
9917
11125
8.0
0. 1
0.3
8.4
11.4
8.5
0.8
9.1
9.6
9.9
47896
51464
52126
53721
54202
51540
54969
55323
55523
56026
-
-
475
410
595
550
550
610
625
605
650
1171
448
1134
528
300
669
780
316
734
114%
1478G
15155
16235
16551
17205
3*7
10.1
10.3
10.3
10.3
10.4
10.6
10.4
10.7
56446
56721
56805
56922
57173
57404
57534
57705
57762
57872
750
760
650
57 5
675
650
7 20
OW
7Eo
775
500
550
246
355
680
734
522
301
414
49 3
17705
10335
18501
18336
19616
20350
20872
21253
21667
22160
10.4
10.5
10.3
10.5
10.4
10.3
10.4
10.4
10.3
10.4
57935
58047
58189
58319
58462
58600
58631
58762
58841
58914
750
725
790
760
725
780
550
805
815
318
614
424
393
563
504
276
513
364
312
22478
23092
23516
23909
21472
24976
25252
25765
26129
26441
10.4
10.5
59032
59124
59185
59185
745
770
325
70
GO3
27044
830
11125
12296
12744
J 3878
”
10.5
10.5
10.6
10.7
10.1
10.4
10.4
10.5
10.1
9.9
9.8
9.1
- Surfactant 7811-VU79
summary of Leaching Data
column 3
7
-
D3 tC
e
No.
Sample
Wei
ht ( )
Individual
&rulittive
Gold
(ppm)
1017
711
604
042
130114
6230
675
406
704
497
531
0.10
0.19
37005
39500
40920
42343
44544
46735
48654
49822
52220
53323
0.20
0.17
0.13
0.16
0.13
0.12
0.09
314
200
105
220
286
263
173
55415
57503
59191
61537
63264
65355
67443
63422
70891
73152
0.07
0.05
0.05
0.02
0.02
75233
77005
79172
W818
0.03
0.04
0.02
0.00
2164
1800
1099
2308
1004
2108
1619
24
27
1914
1042
18516
20316
22215
24523
26327
28435
30054
32401
34395
36237
1.1
78
321
322
323
324
325
326
327
320
329
330
1568
1695
1420
1423
2201
2191
1919
1168
2390
1103
9
IO
333
11
334
12
13
335
I4
I5
16
330
331
332
17
339
123
340
2092
2000
1GE8
2346
1727
2091
2008
979
2169
2261
341
342
26 343
1/2/05 344
2001
1772
21 67
1646
19
21
530
605
640
635
640
53516
54776.
55536
56205
56728
57255
57611
57902
50093
58143
10 311
312
19
313
20
314
21
315
22
316
23
317
24
310
25
319
26
320
27
'
0hl
2372
4245
5252
647ll
7772
0022
1020s
11295
12367
2380
1260
760
669
523
527
356
291
191
350
<0.5
0.6
3.7
5.6
6.2
5.2
3.3
2.7
2.0
1.3
336
337
m
1560
1873
1007
1226
1294
1050
1303
1090
1072
20
15
50
75
210
295
305
390
400
435
020
2412
4304
5173
7025
8861
10372
12639
14456
16352
0.7
0.40
0.29
0.29
0.25
0.22
0.12
0.09
105
0.06
0.06
144
66
58757
59045
59230
59450
59744
60007
60180
60205
60429
60495
0.01
0.03
21
63
135
164
121
146
101
49
49
45
60516
60579
60714
60878
60999
61145
61249
61298
61318
61393
62
71
43
61455
61526
61569
61569
0.08
0.07
0.07
"
"
anido(mg)
per liter
CYConsumal
CkmulilLivc.
410
1365
0661
14760
24302
33929
38916
45037
40671
51136
020
1592
1972
1009
1552
1036
1511
2267
1017
1096
29
30
12/ 1
2
4
5
6
7
0
Individual
Cumulative
-
410
955
7296
6099
9622
9547
4987
6121
3634
21
65
301
9 302
10
303
11
304
305
12
306
13
307
14
300
15
16 309
17 310
11/ 0
Gold Extraction (ug)
700
710
740
710
700
GM
11W5
14779
15621
1627
16946
17432
10136
10632
I9lGG
755
700
750
750
700
705
790
790
735
345
415
426
356
550
650
566
2415
504
292
795
429
775
170
790
755
725
355
575
475
410
595
215
303
306
23952
24422
21777
25352
25027
26245
26040
27055
274.30
27031
562
211396
800
715
700
845
825
730
775
325
00
19511
1997.6
20352
20700
21250
2191 6
22402
22727
23231
23523
pll
8.1
8.1
0.3
0.5
0.5
0.5
9.2
9.1
9.9
9.9
9.9
10.0
10.2
10.5
10.5
10.5
10.5
10.7
10.6
10.7
10.6
10.7
10.5
10.5
10.5
10.2
10.1
10.5
10.4
10.4
10.5
10.5
10.6
10.6
10.7
10.7
10.4
10.4
10.5
10.5
10.1
10.2
9.7
9.5
column4
- S u r f a c t a n t 3a4-785
summsry of Leaching Data
sample
a2t C
NO.
Sample Weight (3)
Individunl
Cumulative
Gold
(pp)
18
19
20
21
22
23
24
25
411
41 2
413
414
415
416
417
418
419
420
2419
1348
2049
1487
1205
2100
18318
19991
22244
23704
26123
27471
29520
31007
32212
34320
421
422
423
424
425
426
427
420
429
430
1061
1716
1568
1826
1308
2358
1154
1368
2446
1547
35381
37097
38665
40491
41799
44157
45311
46679
49125
50672
13
14
15
1.6
17
10
431
432
433
434
435
436
437
438
439
440
2146
1510
2450
2225
622
2594
1966
1712
2043
2346
52018
54328
56778
59003
59625
62219
64105
65897
67910
70286
0.01
0.05
0.07
0.05
0.05
0.05
0.02
0.02
0.02
19
21
26
1/2/05
4.1 1
44 2
443
444
2000
1049
2060
15GO
72206
74135
76203
77771
0.05
0.03
0.03
0.00
26
27
28
29
30
12/ 1
2
4
5
6
7
0
9
10
11
12
1673
2253
1460
1203
5r>on
GI371
1460
11339
49016
250
300
385
395
430
072
9G9
1159
1220
l0ln0
11333
12567
1089
1003.8
743
409
532
297
451
104
145
379
51705
52709
53453
53062
54394
54690
55141
55245
55390
55769
535
6.15
625
GOO
670
725
750
625
700
715
078
6.14
1344 5
9.9
I,llrn*>
10.0
845
1 .1~'3.1
10.3
9 4
15510
790
371
512
550
362
60 1
16116
10.4
10.5
I Grill7
17199
17757
I0110
111720
10.5
10.6
10.7
10.6
10.7
159
257
172
183
131
109
69
96
196
62
55928
56186
56358
56541
56671
56860
56930
57025
57221
57283
710
730
700
750
675
700
700
750
770
795
300
463
170
457
425
707
316
M2
563
317
1TxI%l1
19,191
199Gl
20'1 I fl
201343
21550
21 nCG
l
22230
22001
23110
10.5
10.5
10.5
10.5
64
15
122
156
31
130
98
34
41
47
57347
57362
57485
57641
57672
57001
57900
57934
57975
58022
800
710
730
800
830
015
429
138
430
556
107
519
531
342
347
434
23547
23905
24475
25031
25210
25737
262GO
26610
26957
27391
100
55
62
50122
58177
50293
58293
725
760
350
70
550
27941
0.15
0.15
0.11
0.10
0.10
410
0.08
0.06
0.07
0.08
0.04
0.03
P(1
130
1.0
0.6
0.33
0.28
0.22
0.22
0.22
0.07
0.12
0.18
1089
17
C~lmUlntlVf
1 ow
1.0
(0.5
(0.5
4.4
7.2
5.6
3 ..7
2.7
2.3
1.6
Effluent
Cyonidc m
(Jr")
per l i t e r ConSlUned
20
10
35
175
510
1298
8259
22047
30363
37607
40972
44597
47662
1020
2597
4179
Go34
7579
9537
10783
12359
14275
16429
16
11
Individual
Cumulative
510
788.5
6960.8
13700
0316
7244.6
3364.2
3624.8
3065.6
2154
1020
1577
1582
1915
1485
1958
,1246
1576
1916
2154
401
402
403
404
405
406
407
408
403
111 0
9
10
Gold EXtractim (ug)
-
800
750
700
000
1561 .
1527
15110
~ura
2561
m m
9211
0.0
8.0
0.1
0.3
0.4
0.6
9.1
9.3
9.7
9.9
10.4
10.2
10.3
10.3
10.4
10.4
10.5
10.4
10.5
10.6
10.5
10.7
10.4
10.5
10.5
10.5
10.1
3.7
9.5
9.4
Column 5
n1 t C
11/ 8
9
10
-
". '".. I
S u r f a c t a n t 88Ol-B3159
Sunlmary of Leaching aata
.I
Effluent
Sample
Sample Weight
(g)
No.
Individual
Cumulative
Gola
(ppn)
501
1158
502
503
501
1901
851
1768
1834
2123
1771
1613
2104
2210
1158
3059
3910
5678
7512
9935
11709
13352
15156
17666
<0.5
0.5
4.5
7.6
7.1
4.4
2.6
2.1
1738
1245
2447
1323
2536
1771
1629
2182
1123
2329
1032
1535
1549
21 10
Gold E x t r a c t i o n (ug)
Individual
Cumulative
Cyanide (tq)
per l i t e r
Consumed
~ ~ m u ] . a t i v a p~
0.9
519
950
3829
13437
13201
10661
4612
3450
3366
1989
579
1529
5359
18796
31817
42478
47091
59541
53907
55896
15
25
40
100
193
255
310
385
435
475
1141
1853
817
1591
1486
1805
1221
1010
1189
1160
8.0
8.2
8.2
0.2
8.4
0.6
9.0
9.4
9.7
10.0
19404
20649
23096
24419
26955
28726
30355
32537
33660
35909
0.8
0.8
0.39
0.25
0.21
0.17
0.11
0.19
0.17
0.16
1390
596
954
331
533
301
179
115
191
373
57287
50283
59237
59568
60100
60401
60500
60995
575
530
625
625
660
700
739
5H5
910
45%
862
531
505
709
10.0
0.17
0.13
0.11
0.10
311
-
37821
39356
40905
43015
41703
47015
18669
49573
51948
51948
540
1262
2270
1918
1521
1946
1910
2344
2135
1582
2517
53210
55480
57428
58949
60895
62835
65179
67311
68896
71413
511
542
543
1/2/05544
2036
1891
2058
1634
73449
75340
77390
79032
11
505
12
13
14
506
507
508
15
509
16
510
17
18
I9
20
?I
511
512
513
514
515
22
516
23
24
517
518
7.5
519
26
520
27
521
20
29
30
12j 1
2
1
5
G
7
8
9
10
11
12
13
I4
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
15
16
538
539
17
18
19
21
26
1688
2342
1624
904
2375
1.6
0.09
0.09
0.06
0.06
0.01
-
200
1 70
21 1
152
211
97
54
24
"
61186
61559
61870
62070
52210
62451
62603
62814
62911
62965
62989
G2989
675
700
690
331
722
725
150
700
765
750
710
755
705
750
504
34
465
496
4 22
G79
300
2G7
594
10.6
10.5
10.5
10.5
10.5
10.3
10.3
10.3
10.4
"
"
0.07
0.05
0.06
0.05
0.05
0.02
0.02
133052
63075
63211
63318
63415
63531
63619
63756
63788
63fl38
605
775
805
740
765
750
725
025
825
850
0.03
0.03
0.04
61
57
02
0.00
"
63899
63956
64038
64038
765
000
325
70
0.07
10.6
10.6
10.5
10.7
10.6
10.9
6'X
63
23
136
107
97
116
117
107
32
50
0.05
0.01
10.0
1.0.3
10.4
190
511
380
395
4 57
,185
615
37.1
277
377
17fl
-
10.3
10.5
10.5
10.6
10.7
~0.7
10.3
IO.,^
10.5
10.5
10.2
9.8
9.5
9. G I