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SUBJECT: Hey GOBS Good luck stay long Posted By: NETS
Post Time: 1/27/04 08:23
« Previous Message Next Message » China Diamond reviews technical report of 702, 703
2004-01-27 05:37 ET - News Release
Mr. Sam Halbouni reports
CHINA DIAMOND CORP ANNOUNCES INDEPENDENT TECHNICAL REPORTS ON 702 AND 703 PROPERTIES
China Diamond has learned that an independent technical report on the company's 702 and 703 properties in the Shandong province of the People's Republic of China has been completed.
"The size and quality of the diamonds obtained in drilling at the 702 property are great incentives to accelerate exploration of the property," said chairman and chief executive officer, Sam Halbouni. "We are optimistic that further exploration will help better define and improve the value to be realized in both the 702 and 703 properties."
The 702 Xiyu property
The 702 mining licence, totalling 0.75 acre, is located in northeastern China, a short distance from the company's producing 701 Changma mine. Exploration since the 1960s has identified 32 diamondiferous kimberlite bodies in the area encompassing the 702 property. Of these, there are nine major diamond-bearing kimberlite bodies and pipes forming the Xiyu cluster, all of which are located on the 702 property licence area. Between 1966 and 1970, the No. 7 geological brigade completed surface trenching, pitting, bulk sampling of the near-surface kimberlite and diamond drilling of 209 holes. An adit, having dimensions of 1.6 metres by 2.0 metres, was driven at a 30-degree decline for 180 metres from surface, approximately 90 metres below surface, and driven through eight of the pipes in the cluster. The No. 7 brigade carried out additional bulk sampling in the period from 1987 to 1990, by test pitting four of the pipes. After review of the available information, SRK is confident in the reliability of the data.
The kimberlite bodies defining the Xiyu cluster are found at or near to surface and are typically separated by 20 metres to 50 metres. It has been inferred from the deep drilling of the kimberlite in the cluster that, with the exception of two pipes, all of the bodies coalesce at depth forming a Z-shaped body measuring 80 metres wide and at least 500 metres long. The drilling shows that the kimberlite, with a grade that increases with depth, continues to at least 600 metres below surface, with excellent potential to add to the current resource base.
In relation to China Diamond's neighbouring 701 Changma mine, the kimberlite pipes from 702 property are characterized by larger and better quality diamonds (less than four millimetres in size) from relatively low-grade kimberlite.
The classified mineral resources for the 702 property as of Nov. 1, 2003, according to the "CIM Standards on Mineral Resources and Reserves: Definitions and Guidelines" (August, 2000) as evaluated by SRK, are summarized in table one.
TABLE ONE
SUMMARY OF CLASSIFIED MINERAL
RESOURCES FOR THE 702 PROPERTY
As of Nov. 1, 2003
Contained
Category Tonnes Grade carats
(ct/t)
Measured 5,021,000 0.050 251,050
Indicated 4,645,000 0.061 283,345
Total
measured
and
indicated 9,666,000 0.055 534,395
Total
inferred 27,664,000 0.121 3,347,344
Note: Based on 1.0-millimetre stone size lower cutoff.
Mineral Resources estimated to depth of 450 metres below surface.
SRK supports the aforementioned mineral resources and recommends that additional bulk sampling, either from additional drilling or underground sampling, be completed to better define different phases within the kimberlite cluster that often have different physical characteristics, diamond stone size distribution and diamond quality. In the opinion of SRK, there exists excellent potential to better define the higher- and lower-value areas of the deposit in which to assess various mining and processing scenarios that maximize economic viability. SRK believes that there exists potential to define a lower tonnage resource with an overall higher average grade than is currently defined.
SRK recommends that additional parcels of diamonds be collected from the bulk sample and valued based on international market sales, and that the valuation be completed for individual pipes, or by phases within each pipe, considering the high variability across the deposit.
In the opinion of SRK, the general area of the 702 Xiyu licence has excellent potential for hosting additional diamond-bearing kimberlite bodies by following up on the initial discoveries of the Chinese geologists. There are a comparatively large number of kimberlite pipes and bodies in the general area of Xiyu forming a north-south diamondiferous belt that is almost 10 kilometres long where 32 kimberlite bodies have been identified to date. If the trend to higher grades at depth continues, evidenced by several of the known pipes, then there may very well be other economically attractive diamond bearing pipes.
Given the proximity of the 702 property to the company's producing 701 Changma mine, there exists potential for synergies in the continued exploration and development of the 702 property.
The 703 property
The 703 property is held under an exploration licence covering approximately 400,000 acres. The No. 7 geological brigade of China has successfully identified a number of diamondiferous kimberlite deposits in the region surrounding the 703 property, including the company's neighbouring 701 Changma mine and the 702 Xiyu diamondiferous kimberlite cluster. SRK believes the emplacement of the kimberlites in the region are related to deep mantle structures that have been further controlled by near-surface crustal faults. The 703 property is located at the intersection of several such major fault zones. The 703 property is underlain by primarily Archean migmatites and gneisses, and much younger Cambrian to Ordovician formations of calcareous sediments and limestones, and is considered a potential host for the same type and age of kimberlite that is found at the neighbouring 701 Changma mine. A thick sequence of Quaternary sediments covers a significant portion of the 703 property, and in the opinion of SRK, may have masked potential kimberlite outcroppings to previous explorers.
Previous exploration on the 703 property has identified several different geological environments known to host diamondiferous deposits, including:
the Wujiacun mountain top conglomerate, where early to pre-Quaternary diamondiferous conglomerate has in-filled the karst type of weathering of the Cambrian limestone in the northeast portion of the licence area;
the Dajintou diamondiferous pipe, also known as the "para-kimberlite" eruptive, is mineralogically similar to the neighbouring 701 Changma kimberlites; and
a number of stratiform basal conglomerates containing numerous diamond indicator minerals.
Follow-up exploration consisting of surface sampling of rock float, test pitting and shallow auger drilling completed by the No. 7 geological brigade has recovered a number of diamonds and indicator minerals from these exploration targets. The results are summarized in table two.
TABLE TWO
SUMMARY OF RECOVERED DIAMONDS AND
INDICATOR MINERALS (PRIOR TO 1996)
Recovered Wt. of
Rock diamonds diamonds Pyropes Chromites
(mg)
Quaternary
Sands and
Gravels 87 410.59 113 1,647
Mountain
top
conglo-
merate 2,205 5,860.85 678 35
Para-
kimber-
lite 86 22.96 67 4
Basal
conglo-
merate - - 3 10
Total 2,378 - 861 1,696
In addition to these anomalous zones, the company completed systematic geological examination of the entire licence area, including 1:10,000 scale geological mapping, stream sediment sampling and ground magnetic surveying that lead to the discovery of several additional zones. The most significant of these being Songjiazhuang, Xiaoquanzhuang and Beixiaoshan zones, where follow-up overburden sampling has recovered a total of eight diamonds and 1,437 grains of high-chromium chromite.
SRK considers the 703 property to be highly prospective for hosting diamondiferous kimberlite deposits, as well as other sedimentary-hosted diamond deposits, because the regional trend of known kimberlite deposits transects the 703 property, and because no kimberlite source of the diamonds and indicator minerals has been identified to date.
SRK recommends identifying the source of the diamonds recovered from surface sampling by means of additional exploration so that known targets can be better assessed and new areas of potential diamondiferous deposits identified. Closely spaced systematic stream and slope sediment sampling, detailed ground magnetometer surveying, and geologic mapping at 1:2000 scale should be completed over the known zones, an area of approximately 4,900 acres. In addition, core drilling is recommended at Dajingtou and at Xiaoquanzhuang, where pipe-like bodies have been inferred from previous geophysical surveying and surface geologic mapping.
Both reports were completed by Michael Michaud, PGeo, of SRK Consulting, a qualified person as defined by National Instrument 43-101, upon completion of a recent site visit. Mr. Michaud is the qualified person for both properties and has reviewed the contents of this news.