Star Diamond Project initial diamond recoveries: 344 carat parcel
Tuesday June 22, 5:07 pm ET
Stock Symbol: SGF: TSX-VEN
SASKATOON, SK, June 22 /CNW/ - George H. Read, P. Geo., Senior Vice President Exploration, is pleased to announce the initial diamond recoveries for the first six sample batches processed from the Star Kimberlite. These are the initial results of some 80 to 100 kimberlite batches that will be processed as part of the bulk sampling program on the Star Diamond Project, the aim of which is to recover a parcel of some 3,000 carats for valuation purposes. A total of 3,355 commercial sized diamonds (greater than 1.18 millimetre square mesh screen), collectively weighing 338 carats, has been recovered from the treatment of 4,913 dry tonnes of kimberlite. Thirty-three diamonds greater than one carat have been recovered and the three largest stones are: 3.50, 3.31 and 3.19 carats, respectively. In addition, 352 diamonds (6 carats) were recovered down to 0.85 millimetre square mesh. The colour of over 80 percent of these diamonds has been classified as white, with a further 12 percent classified as off-white.
Initial kimberlite processing commenced in three areas of the Star Kimberlite:
1.) The top of the kimberlite (Batch 1) was used to commission the plant as low diamond grades were anticipated due to dilution caused by abundant mudstone xenoliths in the immediate vicinity of the shaft.
2.) Kimberlite was processed from the shaft above (Batch 5) and below (Batch 7A) the 175 metre shaft station, in addition to the kimberlite extracted to construct the 175 metre station (Batch 6).
3.) Kimberlite from the 235 metre shaft station (Batch 9) and kimberlite from the base of the shaft (Batch 10).
The kimberlite batches from the 175 and 235 metre shaft stations were processed to confirm lateral drift development proceeding on these levels. Batches 2A, 2B, 3A, 3B, 4A, 4B, 7B, 7C (all from shaft), 11 and 12 (from 235 metre level) have all been processed on-site and the concentrates dispatched to the sorting laboratory for final diamond recovery. Results from these batches are pending.
All batches processed to date are classified as crater facies volcaniclastic kimberlites. The batches from the upper portion of the Star Kimberlite (Batches 1 & 5) are Late Joli Fou stratigraphic equivalent kimberlites while the batches from the lower part of the shaft (Batches 7, 9 & 10) are Early Joli Fou equivalent kimberlite. Batch 6 is located approximately at the boundary of the Early and Late Joli Fou kimberlite phases. Batch 6 exhibits some dilution from country rock mudstone xenoliths. The results suggest significant grade differences between the Early and the Late Joli Fou kimberlites. Batch 7A is a highly altered kimberlite breccia. The first shaft station was established at 175 metres below surface, above this altered breccia, for mine safety reasons. It is anticipated that lateral drift development will intersect this highly prospective breccia to the east of the shaft. Current mining on the 235 metre level has intersected similar breccias to Batch 7.
Initial kimberlite processed and diamond results for these six sample batches are listed in the table below. Grades are expressed in carats per hundred tonnes (cpht).
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Location Diamonds Largest
Batch (metres below Dry Number of Total Grade Stone
No. surface) Tonnes Stones (carats) (cpht) (carats)
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1 Shaft: 107-131.4 825.52 246 13.08 1.58 1.30
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5 Shaft: 161.5-171 373.90 238 18.51 4.95 2.61
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6 Shaft & Station:
171-190.5 1,878.06 1,093 130.68 6.96 3.50
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7A Shaft: 190.5-196.2 265.83 356 32.85 12.36 2.87
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9 Station: 230.4-235 983.34 1,093 91.98 9.35 2.14
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10 Shaft: 237-250 586.13 681 57.06 9.73 1.10
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Total 4,912.78 3,707 344.16 7.01
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The three largest stones have been recovered from Batch 6: 3.50, 3.31 and
3.19 carats (all white), respectively. Ten diamonds exceed two carats and 33
diamonds exceed one carat of which 25 are white, 5 are off-white and three are
brown. A total of 88 diamonds exceeds 0.5 carat. Over 80 percent of the total
diamond parcel is classified white in colour, with a further 12 percent
classified as off-white. The diamond parcel includes 24 yellow, 21 pink and
three green stones. Ninety-eight percent of the carat weight of this parcel
occurs in diamonds greater than 1.18 millimetre square mesh. A selection of
images of some of these diamonds is available on the Shore Gold website:
www.shoregold.com
Senior Vice President Exploration, George Read, states: "These initial
diamond results justify the significant work that has been required to
commission this bulk sampling project. We are greatly encouraged by these
results, in particular, the size and abundance of large stones and the overall
high percentage of white stones".
The diamond recovery procedure includes on site processing of kimberlite
through the modular dense media separator (DMS), after which DMS concentrates
are batch fed through an X-ray Flow-sort. In order to ensure the recovery of
low luminosity diamonds, the Flow-sort tailings are processed over a grease
table. Flow-sort and grease table concentrates are transported by a secure
carrier to SGS Lakefield Research for final diamond recovery. The SGS
Lakefield Research process includes drying, screening, magnetic separation,
manual sorting and diamond weighing and description. SGS Lakefield Research is
accredited to the ISO/IEC 17025 standard by the Standards Council of Canada as
a testing laboratory for specific tests.
Grease table tailings and samples of the DMS light fraction have been
sent to Rio Tinto's Thunder Bay Mineral Processing Laboratory for audit. These
tailings fractions will be audited for both free and locked diamonds down to
0.85 millimetre square mesh. The audit process includes screening, drying,
magnetic separation, crushing and manual sorting. The audit process was
delayed due to an abundance of sulphide in the grease table tailings of
kimberlite Batch 1. Grease table tailings audits for free diamonds have been
completed for Batch 1 and part of Batch 6. Low diamond recoveries from the
audit samples confirm the integrity of the processing plant. Most of the
diamonds recovered from the audits are small (1.18 - 1.70 millimetre square
mesh) and poor quality (brown or grey in colour). Audit sample processing
continues and results will be integrated with final results. The Thunder Bay
Mineral Processing Laboratory is accredited to the ISO/IEC 17025 standard by
the Standards Council of Canada as a testing laboratory for specific tests.
Senior Vice President Exploration, George Read, Professional Geoscientist
in the Provinces of Saskatchewan and British Columbia, is the Qualified Person
responsible for the verification and quality assurance of analytical results.
The Star Diamond Project is designed to recover a parcel of at least
3,000 carats of diamonds to enable an accurate valuation of the stones. Up to
25,000 tonnes of kimberlite will be recovered from the shaft and drifts and
processed on site to produce this diamond parcel. Shore is a Canadian based
corporation engaged in the acquisition, exploration and development of mineral
properties. Shares of the Company trade on the TSX Venture Exchange under the
trading symbol "SGF".
The Company is hosting a conference call at 09:00 am Eastern Time on
Wednesday June 23, 2004. Please dial 1-877-888-7019 or 1-416-695-5259 to
participate.
"The TSX Venture Exchange has not reviewed and does not accept
responsibility for the adequacy or accuracy of this release"
newswire.ca
For further information
Kenneth E. MacNeill, President & C.E.O.
George Sanders, Vice President Corporate Development
or George H. Read, P. Geo., Vice President Exploration at (306) 664-2202
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Source: Shore Gold Inc. |
