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The Burra property is located 40 km
east of Cobar in the highly prospective Canbelego-Mineral Hill volcanic
belt of the Lachlan Fold Belt in central New South Wales. The
Burra prospect was part of the much larger Canbelego tenement which was
sold to Polymetals at the end of 2008. The Burra prospect has
good potential for Cobar style copper-gold mineralisation with some
history of exciting drill hole intersections. Drilling of
1,000 m
of RC and diamond core commenced has commenced and results have been
received and summarised below.
The prospect is located at the
historic Burra Copper Mine that recorded minor production in the late
1880’s.
A three hole RC and core
drilling was carried out at the Burra Copper prospect
during May and June, 2008 and a further 3 RC/core holes were drilled in
early 2009. The presence of high grade copper
intervals of up to 6.45% within broader intervals in the sulphide zone
is particularly encouraging (see table below).
This drilling followed up on results from GCR's 2004 program
which returned:
• 11m at 3.1% copper from 140m
• including 2m at 13.7% copper
The drilling program intersected a north-south striking
copper-rich zone. Minor lead-zinc mineralisation was also
intersected and may form part of a zone related to the copper
mineralisation or controlled by the northwest-trending contact zone
between Ordovician Girilambone Beds and Devonian sediments and
volcanics.
The new intersections confirm the continuity of mineralisation at Burra
over an open 150m strike length and indicate down dip potential, beyond
the existing 100m, with the mineralisation showing typical Cobar-style
characteristics. Future drilling will be directed to test the
zone at depth, as Cobar-style lenses generally have short strike
lengths but deep extensions.
If the Burra Copper prospect can be advanced and resources subsequently
defined, it will be well placed in terms of potential development
options, with a number of operating mines and mills at Cobar and
Tritton, within a 75 km radius.
Best results from the recent drilling program are set out below:
|
Hole
|
From
|
To |
Width |
Cu% |
Ag g/t |
| GCB 156
|
55 |
66 |
11 |
0.86
|
5.4
|
| incl
|
57 |
61 |
4 |
1.25
|
5.4
|
| and
|
66 |
68 |
2 |
0.04 |
6.9
|
| GCB 157
|
51 |
57 |
6 |
0.39
|
0.6
|
| incl
|
54 |
56 |
2 |
0.78
|
0.7
|
|
|
64 |
65 |
1 |
0.48
|
1.6
|
| GCB 158
|
147
|
158
|
11 |
1.27
|
2.7
|
| incl
|
147
|
150
|
3 |
2.84
|
4.5
|
| and
|
147
|
148
|
1 |
6.45
|
9.9
|
| and
|
154
|
158
|
4 |
1.32
|
2.6
|
| and
|
154
|
155
|
1 |
3.36
|
6.4
|
| and |
196 |
198 |
2 |
1.04 |
1.7 |
| and |
200 |
206 |
6 |
1.00
|
1.6 |
| GCB
159 |
132 |
135 |
3m |
0.63 |
2.7 |
| |
138 |
140 |
2m |
1.38 |
1.5 |
| GCB
160 |
187 |
204 |
17m |
0.97 |
1.4 |
| incl |
190 |
193 |
3m |
2.05 |
2.4 |
| and |
192 |
193 |
1m |
4.57 |
4.3 |
| GCB
161 |
220 |
229 |
9m |
0.83 |
2.8 |
| incl |
220
|
222
|
2m |
1.68 |
16.9 |
| and |
226
|
229
|
3m |
1.11 |
1.8
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These and other intersections are shown in plan and sections in the
following diagrams.
A 3D spin-through of the historical underground
workings with drill hole intersections can be viewed below.
In the spin-through the grey sheets are faults, the green
sheet is a wireframe of the unconformity believed to be associated
with the mineralisation and the underground workings are in orange.
The drill traces have been coloured with copper grade with
the following colour scheme -
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