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Exploration
Exploration has been in two phases. Initially, using geological sampling, radiometric scanning, pitting, and trenching. The second phase, already commenced, will be to define the extent and grade of the tin deposit by drilling and analysis of the drill core.
Siankopo, the most evaluated lease to date, has 5 substantial sites which are suitable for mining. In particular, 2 sites are high grade (called “The Grave”) and Kapongo Hill is lower grade but larger quantities.
Libra is now focusing on these areas in Siankopo with more drilling to qualify and quantify the ore resource.
Libra has confirmed, so far, ore resources of 10 million tonnes in Siankopo in the eluvial zone located in the top 2-3 metres. This eluvial zone is ideal for low cost open pit mining. Further drilling is required to define the extent of this ore body beyond the currently estimated 10 million tonnes. Drilling to depths of 30 metres is expected to intersect further ore resources.
Libra plans to carry out this drilling program and metallurgical tests as soon as possible to prove up ore resources. It is proposed to focus in the area where 3 veins were found in pit no. 70 in Kapongo Hill in Siankopo (see Kapongo Hill map no. 2).
Drilling Stage 1 of the drilling plan will be 20 holes adjacent to pit no. 70.
Stage 2 will be a further 130 holes drilled at 5 sites in Siankopo.
Stage 3 will be mineralogical and metallurgical analysis.
 Particle analysis
Separation tests
Recovery tests
Metallurgical Flow sheet and optimization
Stage 4 – open cut mining.
Drilling Plans
1. Siankopo Priority drilling on Kapongo Hill where the tin vein is located.
Description of Proposed Drilling Activity :
The location of the vein is 0482218-8060082 The thickness of the vein in the outcrop is 100cm. This was determined from Trench No 1 (T1) starting from 0482343-8059946 to 0482206-8060114 east-west, The location of the KH1 is 0482218-8060082 at an angle of 70 degrees to the east. KH2 will be 10m to the north-east of KH1 KH3, KH4 and KH5 on the same line (strike) with KH2 and 10m apart. On the other side of the strike, KH6, KH7, KH8, KH9 and KH10, at the same spacing. The second vein is located in 0482237-8060067 The location of KH11 on the same point above, KH12, KH13, KH14, KH15 and KH16 will be in the left side of KH11 facing east, and KH17, KH18, KH19 in the right side of the KH11. All the holes will be 70 degrees to the east and 50m long. KH 20 will be in the location of 0482255-80560043 in 45 to 60 degrees to the west.
Hole No |
Location |
Angle degree |
Depth m |
KH1 |
0482218 8060082 |
70 |
50 |
KH2 |
0482213 8060093 |
70 |
50 |
KH3 |
0482210 8060083 |
70 |
50 |
KH4 |
0482208 8060071 |
70 |
50 |
KH5 |
0482205 8060060 |
70 |
50 |
KH6 |
0482217 8060107 |
70 |
50 |
KH7 |
0482220 8060116 |
70 |
50 |
KH8 |
0482222 8060127 |
70 |
50 |
KH9 |
0482224 8060136 |
70 |
50 |
KH10 |
0482226 8060146 |
70 |
50 |
KH11 |
0482237 8060082 |
85 |
50 |
KH12 |
0482234 8060058 |
85 |
50 |
KH13 |
0482233 8060048 |
85 |
50 |
KH14 |
0482230 8060038 |
85 |
50 |
KH15 |
0482227 8060028 |
85 |
50 |
KH16 |
0482240 8060075 |
85 |
50 |
KH17 |
0482243 8060084 |
85 |
50 |
KH18 |
0482245 8060094 |
85 |
50 |
KH19 |
0482247 8060103 |
85 |
50 |
KH20 |
0482248 8060050 |
45-60 |
50 |
Drilling Timetable:
Once given the go-ahead:
Two weeks preparation for drilling.
Drilling of the main tin vein, say, one month.
Drilling of the second tin vein, say, another one month.
Drill sample analysis in Australia, say, one month.
2. The Grave Area
The Grave Area contains interesting concentrations of tin, rhodium and gold in the pits 95, 96, 98 and 114.
This area will be investigated in greater detail later this year.
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