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Island Gold Mine Reserves and Resources
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Island Gold Mine Reserve and Resource Estimates
(100%)
As at December 31, 2007 the Island Gold Mine, Proven
and Probable Reserves were estimated at 1,058,881 tonnes of ore at a
grade of 8.39 g/t for 285,536 ounces of gold. Measured and Indicated
Resources totaled 590,167 tonnes at a grade of 10.14 g/t for 192,422
ounces of gold while Inferred Resources were estimated at 613,635 tonnes
at a grade of 9.80 g/t for 193,350 ounces of gold. These tonnages have
all increased since the previous estimate dated May 15, 2007 as a result
of exploration.
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Island and Lochalsh Zones |
December 31, 2007 |
May 15, 20071 |
|
Reserves |
Tonnes
(metric) |
Grade
(g/t Au) |
Ounces |
Tonnes
(metric) |
Grade
(g/t Au) |
Ounces |
|
Proven |
369,325 |
8.91 |
105,773 |
106,835 |
8.62 |
29,598 |
|
Probable |
689,555 |
8.11 |
179,763 |
907,019 |
8.54 |
249,113 |
|
Total Proven and Probable |
1,058,881 |
8.39 |
285,536 |
1,013,854 |
8.55 |
278,711 |
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Island, Lochalsh and Goudreau Zones |
December 31, 2007 |
May 15, 20071 |
|
Resources2 |
Tonnes
(metric) |
Grade
(g/t Au) |
Ounces |
Tonnes
(metric) |
Grade
(g/t Au) |
Ounces |
|
Measured |
8,135 |
6.45 |
1,687 |
5,835 |
4.59 |
860 |
|
Indicated |
582,032 |
10.19 |
190,735 |
448,870 |
10.33 |
149,112 |
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Total Measured and Indicated |
590,167 |
10.14 |
192,422 |
454,705 |
10.26 |
149,972 |
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Inferred |
613,635 |
9.80 |
193,350 |
610,728 |
9.96 |
195,549 |
1 Based on GENIVAR estimates as at May 15,
2007 with geological information available as at January 31, 2007.
2 Resources presented in the above table are exclusive of
reserves and do not have demonstrated economic viability at this time.
For the reserves, the geological envelope takes into account a cut-off
grade of 5 g/t Au and a minimum true thickness of 2.0 metres for stope
openings and 3.0 metres for development. Mining dilution of 20% at 0.5
g/t Au was applied. Reserves are based on a gold price of US$650/oz with
an exchange rate of C$=US$ of 1.00 (i.e gold price of C$650/oz). For the
resources, the geological envelope takes into account a cut-off grade of
5 g/t Au and a minimum true thickness of 1.5 metres for Lochalsh,
Goudreau and Inferred Resources at the Island Zone, 2 metres for
Indicated and Measured Resources at the Island Zone. High values are cut
to 75 g/t Au. The average ore density is 2.82 tonnes/m3. A block model
for the reserves and resources was interpolated using the inverse
distance to the second power. A 20-metre (Island Zone) and a 25-metre (Lochalsh
and Goudreau Zones) spherical search ellipsoid was used in the model
with restriction on a maximum of 4 composites.
The Proven Reserve Category and the Measured Resource
Category were calculated with a zone of influence of 10 metres from mine
openings along strike. The Probable Reserve Category and the Indicated
Resource Category were calculated with a maximum of 20 metres between
drill holes for the Island Zone and 25 metres for the Goudreau and
Lochalsh zones. Finally, the Inferred Resources are defined by isolated
drill hole intercepts showing no clustering inside an envelope of 20 and
25 metres respectively. The crown pillar is not included in this
resource estimate. The average true thickness of each zone is 2.7 metres
for the Island Zone, 2.3 metres for the Lochalsh Zone and 3.1 metres for
the Goudreau Zone.
In addition, the Island Gold Project includes the
past-producing Kremzar Mine which has historical (pre NI 43-101)
Reserves. The latest estimate of resources for the Kremzar mine was
completed in December 1990 by Derry, Michener, Booth and Wahl (DMBW),
just as the mine was closing. Mineral Reserves at the time of closing
were 181,944 tonnes at 6.27 g/t Au in the Proven and Probable Category
and Possible Reserves of 85,952 tonnes at 7.04 g/t Au (Parish 1990). The
possible category, which was eliminated in 2000 (CIM 2000), is
considered roughly equivalent to the Inferred Mineral Resources with
dilution added in the new CIM classification system.
Management is not treating the historical estimate as
current, but believes that the DMBW estimate is relevant because it is
the most recent estimate available and that it is probably reliable. A
qualified person has not done sufficient work to classify the historical
estimate as current mineral resources or mineral reserves. Readers are
cautioned that the Kremzar Mine reserves are historical estimates that
predate NI 43-101 and should not be relied upon.
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