As the portal Diamond World News Service, the average price per carat also decreased from $ 145 in October to $ 116.9 in November.
Also, the portal quoted Minister of Geology and Mining of Angola, Francisco Queiroz (Francisco Queiroz), who said that the diamond production in Angola fell to 7.2 million carats in 2016, against 8.394 million carats in 2015.
Mining Society of Catoca (Catoca Mining Society) is the largest diamond producer in the country, providing 75% of their total production, while the artisanal mining of stones dropped by 60%, according to Diamond World News Service.
At the same time Keyrosh, according to the portal, said the strong sustained performance in the diamond sub-sector and presented a positive outlook for a sustainable recovery in the future.
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As noted in Gem Diamonds, Letšeng mine (Letšeng), owned by the company by 70%, will be underground in 2025.
Engineer long-term planning activities Gem Diamonds Madove Alfred (Alfred Madowe) said at the Diamond Conference in Gaborone, Botswana, the company completed a concept study of an underground mine.
"We are considering the creation of an underground mine, - he says -. In fact, we conducted a conceptual study to establish the dates of the beginning of underground mining of diamonds This will happen around 2025, so we still have a lot of time.".
Gem Diamonds has opened the first underground mine in Botswana in 2014.
Letseng mine the resource 5 million carats, as of 2014, is reported to be the best in the world kimberlite project cost per carat of diamonds.
. "We have the highest cost per carat of diamonds in US dollars Mine cars (Karowe) can not approach us on this indicator," - said Madove.
Last year, the company's cars Lucara mine in Botswana was produced the second largest diamond in the world.
Meanwhile, the mine Letšeng produces only a small percentage of diamonds smaller than 2 mm.
Mine production increased to 55,000 carats in 2006 to 108,569 carats in 2014. Production peaked in 2012, amounting to 114 350 carats.
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