Tuesday, October 26, 2021

Mponeng - World's deepest Gold Mine

Mponeng is a gold mine in South Africa's North West Province, about 65 km southwest of Johannesburg, owned by AngloGold Ashanti. Mponeng means 'look at me' in the local Sotho language. Formerly the Western Deep Levels South Shaft, or Shaft No 1, Mponeng is the most recently sunk of the three former Western Deep Levels mines. The global record was broken in 2009 after digging 3,777m. With the current sink, the mine would go down to 4,100m. Plans could take the Mponeng Mine to 4,500m below the surface.
The mine was originally built by the Anglo American Corporation with its 2 km (1.2 mi) deep main shaft being sunk in 1957.
The Mponeng Mine is also one of the world's richest with grades at over 8g/t. Production is primarily sourced from the Ventersdorp Contact Reef, a seam of ore that averages only 30 inches wide. Work is progressing to extract the ore from the Carbon Leader Reef below it.
In an effect known as the geothermal gradient, the temperature of the earth increases with depth. Rock temperature reaches 140 degrees Fahrenheit and humidity 95 percent. 6,000 tons of ice a day keeps Mponeng's deepest levels at 83 degrees. Ice is made in a surface plant, then mixed with salt to create a slush that is pumped to underground reservoirs. There, giant fans pass air over the coolant and push the chilled air further down into the mining tunnels.
Every day the 4000 miners at the Mponeng Mine detonate 5,000 pounds of explosives. Every day they take away 6,400 tons of rock. The laws of compressive force dictate that the rock will try to close the spaces left by mining.
Six hundred times a month a "seismic event" will shudder through the Mponeng mine. Sometimes the quakes cause rockbursts, when rock explodes into a mining cavity and mows men down with a deadly spray of jagged rock.

Sometimes a tremor causes a "fall of ground"—the term for a collapse. Some of the rockbursts had been so powerful that other countries, detecting the seismic signature, had suspected South Africa of testing a nuclear bomb.

Thursday, October 21, 2021

Orca Gold Inc. - ORG.v

Orca Gold Inc. - ORG.v is focused in North and West Africa. Orca's flagship is the Block 14 gold project, located in northern Sudan, near the border with Egypt.

A Feasibility Study predicts average gold production of +200,000 ounces per year for at least seven years.
On 2021-10-21 the company released News

Orca Gold Inc. and the Government of Sudan signed all the key development agreements to proceed with the formal construction of a large commercial gold operation at the Block 14 Gold Project in northern Sudan. The signing took place at an official ceremony held on October 20, 2021, at the Ministry of Minerals in Khartoum, Sudan. Orca's President and CEO, Richard Clark, signed on behalf of the Company and his Excellency, the Honorable Minister of Minerals, Mohamed Bashir Abu Numo, signed on behalf of the Government of the Sudan.