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據美國《地質時報》最近報道,1991年世界金剛石工業出現了許多重大進展。在中國遼寧省發現一顆重達60.5克拉的鑽石;在華東地區有多處含有金剛石砂礦的金伯利巖;在加拿大薩斯喀徹溫省的金伯利巖鑽取巖芯樣時,發現了重要的金剛石礦,其中最大可達0.6克拉,有些還是寶石級的;西澳大利亞Poseidon公司在Bow河金剛石的產量超過了90年產量的近40％。91年的總產量高達72萬克拉以上,該礦床中有20％的金剛石屬於寶石級;印尼金剛石公司正在Panau Seran勘查沖積型金剛石并從事採礦活動,今後幾年内,年產量將由原來的3萬克拉增至5.4萬克拉,其中寶
According to a recent report by the US Geological Times, in 1991 the world’s diamond industry made many significant advances. A diamond weighing 60.5 carats was found in Liaoning Province, China; Kimberlites containing diamond sand deposits were found in many areas in eastern China; when core samples were drilled in Kimberlite, Saskatchewan, Canada, they found important Diamond mines, which can reach a maximum of 0.6 carats, some are gem-quality; Western Australia Poseidon’s diamond production in the Bow River exceeds nearly 90 percent of its 90-year production. With a total production of 91 million carats or more in 1991, 20% of the diamonds in this deposit belong to gem grade; Indonesian Diamond Company is exploring alluvial diamonds and engaged in mining activities in Panau Seran. In the next few years, the annual output will be 30,000 carats. Increased to 54,000 carats, of which treasure