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This list of deepest mines includes operational and non-operational mines that are at least 2,224 m (7,297 ft), which is the depth of Krubera Cave, the deepest known natural cave in the world. The depth measurements in this list represent the difference in elevation from the entrance of the mine to the deepest excavated point.
This huge company further worked on the Big Hole until it came to the depth of 215 metres, with a surface area of about 17 hectares and perimeter of 1.6 kilometres. By 14 August 1914, when work on the mine ceased, over 22 million tons of rock had been excavated, yielding 3,000 kilograms (14,504,566 carats) of diamonds.
The largest diamond of the mine was found on 23 December 1980; it weighed 342.5 carats (68.50 g) and was named "26th Congress of the Communist Party of the Soviet Union" (Russian: XXVI съезд КПСС). The mine operation was interrupted in the 1990s at a depth of 340 m (1,120 ft) after the pit bottom became flooded, but resumed later. [8] [9]
Small rough diamonds from Russia. Crystals are about 0.7 to 0.9 mm in size. There are a limited number of commercially available diamond mines currently operating in the world, with the 50 largest mines accounting for approximately 90% of global supply. [1]
On 21 September 2008 Gem Diamonds, Ltd. announced that it found a 95.6 grams (478 carats) diamond of high quality, making it the 20th largest diamond ever found. It is a type II D colour, with potential to yield a 30 grams (150 carats) cut stone.
It has an average mining depth of 65 metres (90m at the deepest point) and a very low stripping ratio. Energy and Minerals Minister William Ngeleja said Petra's entry is "an opportunity to breathe new life into Williamson Mine and Tanzania's diamond mining sector." [16]
The Jwaneng Diamond Mine is situated within the Orapa Kimberlite Field. [14] In the mine lies the "Jwaneng pipe," [15] a volcanic crater formed during the Permian period. [16] The mine consists of three kimberlite pipes. [17] Diamond-bearing ores are extracted from the vast pit and transported to processing facilities and manufacturing ...
Argyle diamond mine The open pit of the Argyle diamond mine. A large mining truck is visible on the road for scale. Location Argyle Diamond Mine Location in Australia Location Lake Argyle State Western Australia Country Australia Coordinates 16°42′44″S 128°23′51″E / 16.71222°S 128.39750°E / -16.71222; 128.39750 Production Products Diamonds History Opened 1985 Closed ...