NEWS RELEASE
August 8, 2007
Channel
Sampling with Metallic Screen Assaying Shows that Fire Assays Underestimate
Gold Grades at the Bonanza-Grade Vein, Pukaskwa Property
Five new channel samples collected
from the Bonanza-Grade zone on Windarra’s wholly-owned Pukaskwa property confirm
the very high gold grades of the zone, yielding an average of 0.826 oz/t
(29.556 g/t; see Table below and News Release dated July 25, 2006).
The samples were
collected to test for the impact of the “nugget effect” at the
Bonanza-Grade zone, in which coarse visible gold is commonly found. All
samples were analyzed with a straight “fire assay” procedure and
also with a “metallic screen” fire assay procedure. Both methods
are industry standard analytical techniques, however the Metallic Screen
procedure utilizes a somewhat larger sample size and involves assaying of both
fine and coarser-grained sample splits. It is considered to yield a more
accurate representation of gold grades for mineralization in which visible gold
grains are common.
As is apparent from the
table below, Metallic Screen assays yield gold values that are more than 100%
higher, on average, than conventional fire assays for the same samples.
Windarra is now cognizant of this issue and is undertaking a program of
Metallic Screen check assaying for all samples collected from the Pukaskwa
property.
Bonanza-Grade Zone Channel Samples*
|
|
Metallic Screen Assay
|
Fire Assay
|
Channel
No.
|
Au (oz/t)
|
Au (g/t)
|
Au (oz/t)
|
Au (g/t)
|
BGZ-05
|
0.403
|
13.813
|
0.164
|
5.631
|
BGZ-06
|
0.0346
|
1.186
|
0.018
|
0.605
|
BGZ-07
|
0.310
|
10.630
|
0.130
|
4.455
|
BGZ-08
|
1.338
|
45.871
|
0.511
|
17.520
|
BGZ-09
|
2.226
|
76.295
|
0.804
|
27.574
|
averages
|
0.862
|
29.559
|
0.325
|
11.157
|
*samples were collected from the vein and its immediately
adjacent wallrock, and the total for each channel sample averaged 0.32 metres
in width (see primary data table below); the values shown above were
calculated for a width of 1.95 metres, with values for the unsampled wallrock
in the calculations assumed to be negligible.
|
Channel samples were sawn
into the stripped and washed, glacially-polished outcrop in which the vein is
exposed. Samples were collected across the strike of the veins, which range
between 8 and 20 centimetres true thickness and average approximately 12 to 15
centimetres. Channel samples were cut 4 to 8 centimetres deep and 10 to 12
centimetres across. Because previous sampling indicated very low wallrock
values, only the immediate wallrock was sampled.
Bonanza-Grade Zone Channel Samples, Primary Data
|
Sample
No.
|
Length
(m)
|
Au
(ppm) Both Fractions
|
Au
(ppm)
Coarse
Fraction
|
Au
(ppm)
Fine
Fraction
|
Channel Sample No. 5
|
PKB7001
|
0.09
|
752
|
69100
|
301
|
PKB7002
|
0.10
|
6.67
|
61.7
|
6.37
|
PKB7003
|
0.20
|
3.58
|
107
|
2.13
|
Channel Sample No. 6
|
PKB7004
|
0.03
|
0.81
|
2.22
|
0.78
|
PKB7005
|
0.08
|
5.83
|
30.3
|
5.46
|
PKB7006
|
0.05
|
0.89
|
5.29
|
0.84
|
PKB7007
|
0.11
|
59.8
|
972
|
28.45
|
Channel Sample No. 7
|
PKB7008
|
0.15
|
2.67
|
30.1
|
2.23
|
PKB7009
|
0.13
|
324
|
7910
|
134.5
|
Channel Sample No. 8
|
PKB7010
|
0.05
|
19.15
|
373
|
12.93
|
PKB7011
|
0.07
|
418
|
12350
|
208
|
PKB7011
|
0.03
|
33.7
|
950
|
23.7
|
PKB7012
|
0.20
|
1220
|
47600
|
446
|
Channel Sample No. 9
|
PKB7014
|
0.20
|
6.89
|
112.5
|
5.47
|
PKB7015
|
0.14
|
2170
|
81100
|
780
|
|
|
|
|
|
|
Future Work:
The Bonanza-Grade vein
has not yet been drilled. Windarra plans to drill-test this zone, and to further
drill-test the Middle Finger Lake zone (see News Release dated July 26, 2007) and other
targets on the property. Prior to drilling the vein, the intent is to strip
the area of strongly anomalous soil geochemistry eastward along strike of the
Bonanza-Grade zone, mainly to provide geologic control for drilling in that
area.
The Pukaskwa property is
located 50 kilometres west of Wawa, Ontario, less than 20 km northwest of
Wesdome’s Eagle River Mine, which has produced approximately 600,000
ounces gold since 1995. The property, which consists of a belt of 55
contiguous unpatented mining claims spanning a length of over 13 km, also lies
20 km southwest of the formerly-producing Magnacon mine, in which Windarra
holds an interest. Like the Pukaskwa property, the Magnacon properties lie
along the highly prospective Mishibishu gold belt.
The field and analytical
data described in this release has been reviewed and approved by C.J. Greig,
M.Sc. P.Geo., a Qualified Person as defined by National Instrument 43-101. A
quality assurance/quality control program is in place for the Pukaskwa sampling,
with the insertion of blank samples in the field, and standards in the lab.
All samples from the channel sampling program were cut using a gas-powered diamond
saw, with samples submitted to ALS Chemex Laboratories of Thunder Bay, Ontario
and North Vancouver,
B.C. for preparation and analysis, respectively. All gold analyses reported in
this release were completed using both conventional fire assay and Metallic
Screen assay procedures.
On behalf of the Board of
Windarra Minerals Ltd.
“John
Pallot”
President
The TSX
Venture Exchange has not reviewed and does not accept responsibility for the
adequacy
or accuracy of the content of this news release.