6. Plan for the implementation of reserve exploration for 9 sub-areas of
Ban Bo area
Level of priority for
reserve exploration
Label of
No
exploration sub.
(decreasing from 1 to
area
3)
Time
(starting in 3/2013 and ending in 1/2015
7/2013
10/2013
7/2014
1/2015
1 KB-CuNi
1
------>
2 BB-CuAu-02
3
-------------------------------------------------->
3 BB-CuAu-03
3
-------------------------------------------------->
4 BB-CuAu-04
3
-------------------------------------------------->
5 BB-CuAu-05
2
6 BB-CuAu-06
3
------------------------------------>
-------------------------------------------------->
BB-CuAu-01
7
1
--------------------->
(Houy kham)
8 Leck1-CuNi
2
------------------------------------>
9 Leck2-CuNi
2
------------------------------------>
V. Detailed introduction on Khoam Bang
multi-metal mine area
- Khoam Bang Mountain is a part of the 700-1000m-wide and
7000m-long strip of ultramafic-magma rocks containing multimetal ores (Cu, Ni, Co, Au, etc.). This strip is arc-shaped and
surrounds the 518m- mountain peak.
- Khoam Bang Mountain can be considered as a multi-metal
laterite mine with the main metals: Cu, Ni, and Fe. In addition, Cr,
W, Au, and Co are also the accompanying elements. The amount
of ore is high and the mining conditions are convenient because
the mine is completely open-cast.
- Khoam Bang mine covers an area of 25ha, of which 5.3 ha is
the top of the mountain
- Khoam Bang mine comprises 2 types of ore:
+ Type 1: ore in the bedrocks below the weathered zone
+ Type 2: ore in the weathered zone
- Khoam Bang mine is bordered by altered diorite masses
Khoam Bang mountain- a multimetal
opencast mine
2. Implemented works in Khoam Bang multi-metal mine
The explored area and implemented works in the Khoam Bang multi-metal mine
3. Element concentrations in the weathered zone
- In Khoam Bang mine, 27 digging holes (the shallowest is 8m
and the deepest is 15m deep) were carried out.
- Number of boreholes: 8 (the shallowest is 54m and the deepest
is 132m deep)
- Number of lines for soil sampling: 8
Analytical results of Ni-Fe laterite ore
Concentration (%)
Zone
Ni
Fe
Yellowish red limonite
0,21,0
Brown and dark gray
limonite
Saprolite
Mg
Si
Cr
5152
4,85,4
1,11,2
0,81,2
6062
1,71,9
0,81,5
25
2026
1620
0,30,5
1214
Reserves of Ni and Fe in the weathered zone
Amount of
Averaged
ore (with
Area (m2) thickness
density of
(m)
2.2 tons/m3)
The lower part
without the
outcrop of
197,000
bedrocks
(19.7 ha)
The higher part
with the outcrop
53,000
of bedrocks
(5.3ha)
Average
concentration
Amount of metal
Ni
Fe
Ni (tons)
Fe(tons)
39,006
3,867,262
10
4,334,000
0.90%
58%
1.5
174,900
0.90%
52%
Total
1,574.1
40,580.10 4,007,182
The value of ore in the weathered zone
Fe
139,920
Ni
Price ($/ton)
70
20,000
Total value ($)
280,502,708
811,602,000
Analytical
results of soil
samples at 9 m
depth in the red
soil layer in hole
No. 1
Analytical
results of soil
samples at 5 m
depth in the
blackish blue
soil layer in hole
No. 3
Analytical
results of soil
samples at 6 m
depth in the
black soil layer
in hole No. 4
Analytical
results of
samples at 9 m
depth in the
saprolite zone
in hole No. 4
Analytical
results of soil
samples at 4 m
depth in the
blackish brown
soil layer in hole
No. 5
Analytical
results of
samples at 4 m
depth in the
saprolite zone
in hole No. 5
Analytical
results of soil
samples at 8 m
depth in the
blackish brown
soil layer in hole
No. 6
Analytical
results of soil
samples at 3 m
depth in the
yellow soil layer
in hole No. 6
Analytical
results of
samples at 1 m
depth in the
saprolite zone
in hole No. 8
Analytical
results of
samples at 1 m
depth in the
saprolite zone
in hole No. 9
Hole Ni-05 with depth of 13m
4.Element
concentrations
in the type 1’s
ore
(bedrocks below
the weathered
zone)
Al2O3
CaO
Fe2O3
K2O
%
MgO
MnO
P2O5
TiO2
Ag
As
B
Ba
Ce
Co
Cr
Cu
La
ppm
Li
Borehole KBD1
Borehole KBD6
18m
45m
55m 71m 41m 51m 56m 57m
1.3
0.48
1.1 0.38 0.56
1.2 0.47 0.76
0.21
0.25 0.42 0.35 0.33 0.45 0.45 0.53
12.3 11.31 13.1 14.5 15.1 17.3 15.5 16.4
0.1
0.06 0.11 0.09 0.16 0.13 0.15
0.2
10.02 17.48 18.2 18.48 16.66 17.44 17.33 15.11
0.78
0.26 0.58 0.56 0.55 0.73 0.44 0.87
0.26
0.01 0.41 0.03 0.01 0.51
0.3 0.24
0.48
0.06 0.28 0.16 0.09 0.58 0.18 0.19
<2
<2
<2
<2
<2
<2
<2
<2
11
20.6
22
26
19
26
33
41
47.8
21.6
33 53.1
23
26 33.1
53
96.7
88.3
89
79
68
69
69
98
22
41.4
34
75
111
78
82
99
727.3 153.2
356
341
213
225
331
67
5437
2314
987 1131
989 1121
578
599
121
132
221
155
178
191
167
159
55
77
23
67
87
79
89
112
12
66
68
75
59
76
54
89
Ni
11,032
Pb
Sb
Sn
Sr
V
W
Y
22
122
231
9.7
54
667
10
9,622 8,713 8,005 8,759 9,811 10,008 9,861
54
132
432
13.1
43.7
811
9
34
127
446
11.7
56
774
11
35
189
357
18.1
71
768
7
56
167
341
34.5
55.1
511
11
51
159
571
23.1
58
613
13
56
150
451
28.1
91
899
19
97
221
339
54.5
112
671
16
Estimated reserves of Ni in the type 1’s ore (ultramafic
magma bedrocks) in Khoam Bang multi-metal mine ( with the
density of 2.4 tons/m3)
Area
(m2)
250,000
Average
thickness
(m)
70
Density
Amount of ore
(tons)
Average
concentration
of Ni
2.4
42,000,000
0.80%
Amount of Ni
(tons)
336,000
- Estimated value of Ni ore with the price of 18.000USD/tons:
6.048.000.000USD