| |
Int'l Wayside receives review/results from Panterra
International Wayside Gold Mines Ltd IWA
Shares issued 37,963,497 May 10 close $2.04
Tue 6 Jun 2000 News Release
Mr. J. Frank Callaghan reports
The board of directors of International Wayside Gold Mines has received
reports from an independent consultant relating to the company's Cariboo
gold property near Wells, B.C. The first report reviewed core handling and
sampling techniques, and made recommendations for improvement in
procedures. The second report was commissioned by the company to verify
sampling results and to conduct petrographic analysis on the newly
discovered mineralization in the footwall of the B.C. vein (the Bonanza
ledge).
The first report recommended certain changes or additions to the core
handling, drilling and sampling process.
The second report states that results of the verification work on 16
samples from the new discovery at the Bonanza ledge zone displayed
excellent repeatability of results and suggests that nugget effect is not a
significant factor.
Core handling procedures
Panterra Geoservices Inc. reviewed core handling and sampling procedures
undertaken at the Cariboo gold property. In a report dated May 15, 2000, by
David Rhys, MSc, PGeo, and entitled Review of Core Handling and Sampling
Procedures at the Cariboo Gold Quartz Property of International Wayside
Gold Mines Ltd., with Recommendations, Panterra reviewed the procedures
being used at the property and made 13 recommendations as to how the
procedures could be changed or supplemented. Panterra's recommendations
either have been, or are in the process of being, implemented. The more
material recommendations are summarized below:
1. A fenced, secure core handling facility containing locking core
logging and processing trailers be constructed at the site, and that
access be restricted to authorized personnel.
2. Sample intervals should be clearly marked in core boxes with the
stapling of a sample tag annotated with the sample interval and number
directly into the core box at the beginning of the interval.
3. The direction in which the core should be cut should be marked on the
core by the supervising geologist charge prior to cutting. The core
should be cut orthogonal to, or at a high angle to, the dominant
lineation developed in the core.
4. No whole core sampling should be conducted in the future.
5. Downhole drill orientations should be obtained.
6. Prior to sampling, core should be photographed, and the photographic
record should be stored in a separate and secure location, away from
the core handling and storage facility.
7. All drilling should be of NQ size.
8. In addition to laboratory internal standards, sampling replicates,
standards and blanks should be routinely inserted into sample sets
during the sampling procedures to ensure laboratory control, identify
contamination and quantify the statistical variation in gold grades.
9. Due to potential contamination, loss of fines and incomplete sampling
inherent in the collection of sludge samples, their continued use
should be restricted to an internal check or guide, and the results
should not be reported publicly or used in any resource calculation.
All of Panterra's recommendations either have been, or are in the process
of being, implemented. In particular: all holes are now of NQ size; the
practice of whole core sampling has been terminated; and a fenced, secure
handling and logging facility is under construction -- one trailor is on
site and a second one is expected to be delivered within a few days.
Bonanza ledge zone
Panterra has also prepared a report dated May 26, 2000, entitled Report on
Petrography, Check Sampling and Geological Interpretation of Drill Core at
the Bonanza Ledge Zone, Cariboo Gold Quartz Property, British Columbia. The
authors of the report are Mr. Rhys, MSc, PGeo, and Katherina V. Ross, MSc.
Check sampling
To verify the results of previous sampling, 16 previously sampled intervals
from several drill holes were selected for resampling by the authors of the
Panterra report. The samples were selected to check the accuracy of a range
of previous reported gold grades from undetectable (less than 0.01 grams
per tonne Au) to high-grade (87.08 g/t Au). All of the diamond drill holes
in the current program up to an including hole BC2K-17 were of BQ size. All
holes drilled after hole BC2K-17 have been of NQ size.
As reported in Panterra's first report, the practice of whole core sampling
has been terminated. Whole core sampling was conducted on some or all
sampling intervals in holes BC2K-03, 04, 08, 09, 10, 11, 12, 13 and 14.
Whole core sampling was completed mainly in friable or broken intervals
within these holes. However, half core is still preserved for many of the
intervals in these holes, including significant portions of the high-grade
intercepts in holes BC2K-10 and BC2K-12.
Samples for the Panterra study were selected from intact split or cut
intervals in which no specimen collection was evident, which limited the
intervals available in high-grade sections. Since no sample tags had
previously been placed in core boxes to mark sample intervals, the sampling
intervals were measured from wooden blocks in the boxes, which may locally
induce error (possibly up to one foot in some locations) in sample location
due to shifting of the block or of core during the frequent moving an
laying out of the core boxes after sampling. Sample tags annotated with the
new sample number, interval and date were stapled by the authors into the
core boxes at the beginning of each resampling interval. The core was then
cut into quarter sections under supervision of the authors. Half of the
quartered core from each interval was placed in a plastic sample bag after
each piece was rinsed in clean water, a sample tag corresponding to the
number stapled into the core box was inserted into the bag, and the bag was
stapled shut. The samples were subsequently placed in a plastic rock pail
and shipped by Greyhound freight directly to ALS Chemex Labs in North
Vancouver for analysis of Au by fire assay with gravimetric finish.
The sampling results correspond positively with the previously reported
results and confirm both the presence and grade of Au in the earlier
samples. The excellent repeatability of Au values in the original and check
samples is consistent with the correlation between original Acme Analytical
Lab results and replicate assays performed by TSL Laboratories and ALS
Chemex Labs on holes BC2K-10 and BC2K-12 and reported in International
Wayside Gold Mines news release in Stockwatch May 15, 2000. The consistent
replication of the results suggests that nugget effect is not a significant
factor in the Bonanza ledge zone. This is supported by the fine-grain size
and even distribution of native gold grains in and associated with pyrite
in the petrographic samples examined during the Panterra study.
CHECK SAMPLING BY PANTERRA OF DRILL CORE
FROM YEAR 2000 DRILL HOLES
BONANZA LEDGE ZONE, CARIBOO GOLD PROJECT
Previous Resampling
Acme Chemex
Acme Au Chemex Au
Interval sample grade sample grade
(f) number g/t Au number g/t Au
Drill hole BC2K-14
344.5-350.0 169935 7.72 303301 5.21
Drill hole BC2K-14
425.0-426.4 169953 4.56 303302 5.00
Drill hole BC2K-14
305.0-310.0 169227 0.22 303303 0.33
Drill hole BC2K-14
448.2-455.0 169962 0.04 303304 less
than
0.07
Drill hole BC2K-10
202.8-211.5 169749 87.08 303305 88.01
Drill hole BC2K-09
376.1-385.6 169807 less 303306 less
than than
0.01 0.07
Drill hole BC2K-11
445.3454.0 169655 less 303307 0.68
than
0.01
Drill hole BC2K-11
270.0-275.0 169639 less 303308 less
than than
0.01 0.07
Drill hole BC2K-10
160.3-166.4 169743 2.52 303309 2.53
Drill hole BC2K-10
322.0-330,0 169771 4.78 303310 5.92
Drill hole BC2K-12
225.0-235.0 169710 13.78 303311 15.82
Drill hole BC2K-12
400.8-406.6 169813 less 303312 less
than than
0.01 0.07
Drill hole BC2K-12
190.0-195.5 169703 2.14 303313 1.53
Drill hole BC2K-13
315.0-320.0 169436 25.21 303314 27.88
Drill hole BC2K-13
340.0-345.0 169442 8.70 303315 6.06
Drill hole BC2K-13
395.0400.0 169455 0.03 303316 0.30
Petrography
In the vicinity of the Bonanza ledge zone, alteration is zoned from an
upper area of intense muscovite alteration containing auriferous pyrite
mineralization with grey-blue quarter-dolomite/ankerite stringers, to a
lower zone of mauve grey, weak muscovite-chlorite albite alteration with
yellow siderite/magnesite stringers. Pyrite mineralization occurs in both
zones, but is best developed in discrete areas locally more than 100 feet
in apparent thickness in the upper zone, where it comprises 15 per cent to
70 per cent of the rock as stringers, concordant laminations and massive
bands. Muscovite, domolomite/ankerite and quartz form gangue to the pyrite.
In these areas, gold occurs as 2.5 to 60 micron grains on fractures or
grain boundaries of pyrite, often with chalcoyrite and galena, or
encapsulated in pyrite. Grades range from five to 80 grams per tonne gold.
Pyrite mineralization in the lower alteration zone is less fully developed
and forms veinlets and bands that are associated with siderite/magnesite,
quartz and chlorite. Here it contains only traces to low-grade gold.
Conclusions
1. The Bonanza ledge zone occurs in an overturned, northeast-dipping
metamorphosed meta-turbidite sequence in the structural footwall of
the B.C. vein.
2. Gold mineralization in the Bonanza ledge zone occurs in discrete zones
of intense pyrite mineralization comprising 15 per cent to 70 per cent
pyrite, as folded pyrite veinlets, bedding and S1 parallel lamina of
the fine-grained pyrite and bands of massive pyrite. All styles join
and are probably coeval, possibly representing a mixture of
replacement and vein-style mineralization. The probable stratabound,
concordant style of much of the pyrite and its early structural timing
also raise the possibility that the deposit represents deformed
syn-sedimentary mineralization. The structural, textural and
mineralogical style of mineralization, and associated alteration
mineralogy of the Bonanza ledge mineralization is similar to pyrite
"replacement" styles of mineralization historically mined at the
Island Mountain and Mosquito mines.
3. In high-grade intervals in hole BC2K-10, 12 and 13, gold occurs as 2.5
to 60 micron native grains, averaging between 10 and 30 microns in
size. Gold grains occur in fractures and along grain boundaries in
pyrite, often with chalcopyrite, galena and sphalerite, or to a lesser
extent, as grains encapsulated in pyrite.
4. Mineralized zones occur in a broad area of muscovite-carbonate
alteration that is developed in the structural footwall of the B.C.
vein. Alteration is characterized by bleaching and loss of
carbonaceous matter. The alteration is locally discordant to
stratigraphy and exhibits zoning from an upper zone of intense
muscovite-dolomite/ankerite alteration to a lower zone of weak
muscovite-siderite/magnesite-chlorite-albite alteration. To date, gold
has only been associated with pyrite in the upper zone alteration.
Pyrite in the lower zone is associated with pyrrhotite and does not
carry gold.
5. Morphology and continuity of the mineralized zone(s) is not yet
understood. Surface mapping and further drilling will be necessary to
evaluate the structural style and distribution of the mineralized
zones.
6. Check sampling has confirmed the presence and grade of gold
mineralization in samples from several drill holes in the Bonanza
ledge area. Although whole core sampling has occured in some
intervals, there is sufficient mineralization material remaining in
core boxes to evaluate the style and distribution of mineralization,
and to perform further check sampling if necessary. |
|
