Owner
Post by Franko10 ™ on Sept 19, 2004 9:58:09 GMT -5
Kimberlitic indicator minerals found by Geological Survey of Canada on North Star's Superior Craton Project
- PR Newswire
BELLINGHAM, WA, Oct 27, 2003 /PRNewswire-FirstCall via COMTEX/ -- North Star Diamonds, Inc. (NQB Pink Sheets: NSDM). North Star Diamonds, Inc. is pleased to report on the ongoing exploration program at the Superior Craton Project, Manitoba. In a News Release dated September 22, 2003 the Company reported it had acquired a 100% interest in strategically located mining claims within the Superior Craton in Canada.
The Company's claim block (16,400 acres) is located in southeastern Manitoba where during the 1990's, positive diamond indicator minerals were discovered in the area by the Geological Survey of Canada. North Star staked a cluster of magnetic anomalies in proximity to these diamond indicators. The Company now reports on the results of this study where significant numbers of kimberlitic indicator minerals have been identified that mark important signatures to the presence of kimberlite pipes.
"In 1991 and 1992 The Geological Survey of Canada, in cooperation with Manitoba Energy and Mines, undertook a till sampling and overburden sampling and drilling project over the drift covered Wabigoon belt rocks of southeastern Manitoba, south of 50 degrees North that includes the North Star claims.
Data from this program included INAA and ICP analyses of till matrix and heavy mineral concentrates, gold grain counts, kimberlitic indicator mineral frequency and chemistry, and lithological data. A total of 465 till samples were acquired from 297 drill holes, 142 from surface sample sites and 26 from river sediments. A total of 195 sand samples were taken from drill core.
The heavy mineral concentrate grains were visually "observed" and potential kimberlitic indicator minerals were selected for electron microprobe analysis. Selected grains were mounted and polished in 25 m cylindrical epoxy mounts.
Semi-quantitative chemical analysis of a total of 1195 grains was carried out using a JEOL 8900 electron microprobe operating at 20 KV and 40 nA. Peak counting times of 10 sec were used for Na20, K20, Ca0, Fe0, Mg0, Al203, Mn0 and Si02 and 40 sec for Ti02 and Cr203. Background determinations were made only on every 50th grain. Calibration was confirmed at the beginning and end of each batch. The analyses were completed in four automated runs which were driven by a set of x-y-z coordinates for one point per grain, selected to avoid inclusions, fractures or pits. At the end of each batch, every 28th grain, on average, was reanalyzed at another similar point to monitor precision related to grain heterogeneity, calibration drift, or unusual background measurements. These replicates indicate good reproducibility above 0.1% for all elements, with a few exceptions attributed to heterogeneity.
The resulting data was used to select and classify minerals as kimberlitic indicator minerals. The data was considered clearly adequate for the recognition of peridotitic garnets and kimberlitic oxides, adequate for the selection of chrome-diopsides, and marginally adequate for the distinction of titanian almandines (.0.15% Ti02).
Garnets (G9, G3) were classified using the Dawson and Stephens as well as the Gurney classifications. Diopsides with greater than ~0.50% Cr203 were regarded as chrome diopsides. Magnesium ilmenites contain 3% Mg0 or more. Diamond inclusion (DI) chromites were enriched in both Cr and Mg. Indicator mineral classification was guided in part by recognition of kimberlite-related chemistry clearly anomalous relative to the remainder of analyzed grains.
A total of 55 kimberlitic indicator minerals were recovered. The occurrences are well distributed but seem to be non-random, hence suggesting sources within the study area.
It should be noted that sample processing for the project was not optimized for recovery of kimberlitic indicator minerals. Instead, processing was designed for recovery of gold and sulphide grains.
A kimberlitic indicator mineral program was added to the project after the concentrates had been processed. It can be roughly estimated that about one quarter to one third of the indicators would have been lost at the shaker table. More significantly, chrome diopsides in particular would have been lost due to the use of undiluted methylene iodide at a specific gravity of 3.3."
North Star has also announced that total of 12 high priority magnetic anomalies, which are associated to a major north-south structure located at the western margin of the Superior Craton, are to be drill tested over the next few months.
North Star Diamonds, Inc. is committed to a long-range plan for diamond exploration and feels that with the Superior Craton Project and the assets in Ukraine, North Star is focused on establishing the Company as a true world explorer in search for diamonds.
Disclaimer: The Company relies upon the safe Harbor Laws of 1993, 1934, and 1995 for all public news releases. Statements, which are not historical facts, are forward-looking statements. The Company, through its management, makes forward-looking public statements concerning its expected future operations, performance and other developments. Such forward-looking statements are necessarily estimates reflecting the Company's best judgment based upon current information and involve a number of risks and uncertainties, and there can be no assurance that other factors will not affect the accuracy of such forward-looking statements. It is impossible to identify all such factors. Factors which could cause actual results to differ materially from those estimated by the Company include, but are not limited to, government regulation, managing and maintaining growth, the effect of adverse publicity, litigation, competition and other factors which may be identified from time to time in the Company's public announcements.
CONTACT: Toll Free: 877-454-7872 or
Email: contact@northstardiamondsinc.com
Walter Stunder, President.
SOURCE North Star Diamonds, Inc.
Toll Free: 877-454-7872 or Email:
contact@northstardiamondsinc.com
(NSDM)
- PR Newswire
BELLINGHAM, WA, Oct 27, 2003 /PRNewswire-FirstCall via COMTEX/ -- North Star Diamonds, Inc. (NQB Pink Sheets: NSDM). North Star Diamonds, Inc. is pleased to report on the ongoing exploration program at the Superior Craton Project, Manitoba. In a News Release dated September 22, 2003 the Company reported it had acquired a 100% interest in strategically located mining claims within the Superior Craton in Canada.
The Company's claim block (16,400 acres) is located in southeastern Manitoba where during the 1990's, positive diamond indicator minerals were discovered in the area by the Geological Survey of Canada. North Star staked a cluster of magnetic anomalies in proximity to these diamond indicators. The Company now reports on the results of this study where significant numbers of kimberlitic indicator minerals have been identified that mark important signatures to the presence of kimberlite pipes.
"In 1991 and 1992 The Geological Survey of Canada, in cooperation with Manitoba Energy and Mines, undertook a till sampling and overburden sampling and drilling project over the drift covered Wabigoon belt rocks of southeastern Manitoba, south of 50 degrees North that includes the North Star claims.
Data from this program included INAA and ICP analyses of till matrix and heavy mineral concentrates, gold grain counts, kimberlitic indicator mineral frequency and chemistry, and lithological data. A total of 465 till samples were acquired from 297 drill holes, 142 from surface sample sites and 26 from river sediments. A total of 195 sand samples were taken from drill core.
The heavy mineral concentrate grains were visually "observed" and potential kimberlitic indicator minerals were selected for electron microprobe analysis. Selected grains were mounted and polished in 25 m cylindrical epoxy mounts.
Semi-quantitative chemical analysis of a total of 1195 grains was carried out using a JEOL 8900 electron microprobe operating at 20 KV and 40 nA. Peak counting times of 10 sec were used for Na20, K20, Ca0, Fe0, Mg0, Al203, Mn0 and Si02 and 40 sec for Ti02 and Cr203. Background determinations were made only on every 50th grain. Calibration was confirmed at the beginning and end of each batch. The analyses were completed in four automated runs which were driven by a set of x-y-z coordinates for one point per grain, selected to avoid inclusions, fractures or pits. At the end of each batch, every 28th grain, on average, was reanalyzed at another similar point to monitor precision related to grain heterogeneity, calibration drift, or unusual background measurements. These replicates indicate good reproducibility above 0.1% for all elements, with a few exceptions attributed to heterogeneity.
The resulting data was used to select and classify minerals as kimberlitic indicator minerals. The data was considered clearly adequate for the recognition of peridotitic garnets and kimberlitic oxides, adequate for the selection of chrome-diopsides, and marginally adequate for the distinction of titanian almandines (.0.15% Ti02).
Garnets (G9, G3) were classified using the Dawson and Stephens as well as the Gurney classifications. Diopsides with greater than ~0.50% Cr203 were regarded as chrome diopsides. Magnesium ilmenites contain 3% Mg0 or more. Diamond inclusion (DI) chromites were enriched in both Cr and Mg. Indicator mineral classification was guided in part by recognition of kimberlite-related chemistry clearly anomalous relative to the remainder of analyzed grains.
A total of 55 kimberlitic indicator minerals were recovered. The occurrences are well distributed but seem to be non-random, hence suggesting sources within the study area.
It should be noted that sample processing for the project was not optimized for recovery of kimberlitic indicator minerals. Instead, processing was designed for recovery of gold and sulphide grains.
A kimberlitic indicator mineral program was added to the project after the concentrates had been processed. It can be roughly estimated that about one quarter to one third of the indicators would have been lost at the shaker table. More significantly, chrome diopsides in particular would have been lost due to the use of undiluted methylene iodide at a specific gravity of 3.3."
North Star has also announced that total of 12 high priority magnetic anomalies, which are associated to a major north-south structure located at the western margin of the Superior Craton, are to be drill tested over the next few months.
North Star Diamonds, Inc. is committed to a long-range plan for diamond exploration and feels that with the Superior Craton Project and the assets in Ukraine, North Star is focused on establishing the Company as a true world explorer in search for diamonds.
Disclaimer: The Company relies upon the safe Harbor Laws of 1993, 1934, and 1995 for all public news releases. Statements, which are not historical facts, are forward-looking statements. The Company, through its management, makes forward-looking public statements concerning its expected future operations, performance and other developments. Such forward-looking statements are necessarily estimates reflecting the Company's best judgment based upon current information and involve a number of risks and uncertainties, and there can be no assurance that other factors will not affect the accuracy of such forward-looking statements. It is impossible to identify all such factors. Factors which could cause actual results to differ materially from those estimated by the Company include, but are not limited to, government regulation, managing and maintaining growth, the effect of adverse publicity, litigation, competition and other factors which may be identified from time to time in the Company's public announcements.
CONTACT: Toll Free: 877-454-7872 or
Email: contact@northstardiamondsinc.com
Walter Stunder, President.
SOURCE North Star Diamonds, Inc.
Toll Free: 877-454-7872 or Email:
contact@northstardiamondsinc.com
(NSDM)
