To: Bobby Yellin who wrote (12083 ) 5/24/1998 3:25:00 PM From: goldsnow Respond to of 116830
Nearly 32,000 people work at Western Deep's three main shafts and a neighbouring mine -- most of them underground for eight hours a day, earning up to 1,500 rand ($295) a month. The day shift starts before dawn when workers enter the mine in high-speed lifts descending at 60 km an hour, reaching three km (1.86 miles) in a few minutes. From the shaft, they walk or take trains through tunnels for several km to the rock face. Working in cramped areas sometimes less than a metre high, they put in tunnel support and set explosive charges. The blasting after the day shift evacuates the mine can be felt in towns several kilometres away. The night shift then cleans out the gold -bearing ore which is hauled to the surface in huge buckets, or skips. After three decades and 1,530 tonnes of gold, Western Deep is running out of reserves. By ploughing 1.1 billion rand into deepening the south shaft, the mine plans to stay open to 2026 and produce another 475 tonnes of gold. BUCKET RIDE AS SMOOTH AS A BUICK ''This is the smoothest ride you'll ever get on this shift,'' said section manager Don Osbourn as he led a tour down the newly-extended shaft in a bucket resembling a beer can with its top sawn off. It holds 20 men or several tonnes of rock and glides through the dark hole like a Buick sedan on a U.S. interstate. ''It's a high risk job,'' said master sinker Jan Breek, an 18-year veteran of South Africa's mines. ''Ordinarily a slip and fall means a scraped knee, but a slip and fall here and it's down the shaft,'' said the barrel-chested shaft builder. Breek, who has suffered no serious mining injury but hurt his leg in a car crash, rides down the dark shaft standing on the bucket's edge like a sailor in ship's rigging. The bucket hits bottom -- 3,737 metres (12,200 feet) -- in less than two minutes. A squad of miners, clad in overalls, rubber boots and hard hats, work under soft lights in an area the size of a tennis court. They wear earplugs to drown out the roar of hydraulic drills biting into rock. It is nearly 30 degrees Celsius (80 degrees Fahrenheit) at these depths, but the heat would soar to a deadly 60 degrees Celsius (140 degrees Fahrenheit) if not for huge refrigeration units pumping cool air from the surface. DEADLY EARTH TREMOR A miner's deadliest enemies at these depths are earth tremors which can collapse a tunnel or rock face. A minimal tremor measuring 0.5 on the Richter scale can equal the force of 100 kg of explosives underground. Last year, a 3.1 tremor trapped 15 miners for several hours about three km (1.8 miles) underground before they were rescued in what was nicknamed the Great Escape. ''It's mother nature. You just touch the rock and it talks,'' said Dragan Amidzic, head of the mine's seismic team. Armed with listening stations scattered about the mine, Amidzic hopes to develop an early warning system that could give miners precious minutes to flee to a safer part of the tunnel before a tremor hits. His team recorded more than 7,400 tremors last month, ranging from minus one to four. Most occur after blasting when the mine is empty. Western Deep's safety record has improved, but it still battles with death and injury rates higher than mines in South Africa, North America and Australia. Industry wide, South Africa's gold mines are safer than years ago. But rock falls, pressure bursts, burning, explosions and other accidents still claimed 267 men and injured 5,449 according to provisional figures for 1997. ''If you look at the safety of these ultra-deep level mines, it's not good. But we have been mining there since the 1960s and we understand what the problems are and we've come up with a lot of solutions,'' Diering said. MINING MAY BE SAFER AT EVEN GREATER DEPTHS Ironically, experts believe mining will be safer as they move deeper into virgin rock. ''We sincerely believe mining at four km (2.4 miles) in virtually new territory using all the best we've got will be a whole lot safer than at three km where it's extensively mined out and the choices are limited,'' Diering said. Last month the industry and government launched Deepmine, a research project designed to see if mining at unthinkable depths of five km (3.1 miles) would be safe and profitable. The technical and safety challenges are enormous. The heat at five km can reach a blistering 70 degrees Celsius (158 degrees Fahrenheit) and a new mine could cost up to eight billion rand. The reward is a vast gold -rich area that may yield up to 800 tonnes of gold. The problem of getting there, working there and bringing the gold back has sparked some futuristic solutions. Some imagine colonies of miners living underground for several days at a time. Others see robots working around the clock with a new-age miner perched behind a video screen on the surface. But Diering dismisses these ideas as pure science fiction. ''We've been there for 20 years already and we're on our way to four kilometres without robots and science fiction.'' ''We're getting there with the technology we've got now and Deepmine has to include what we know now.'' ((Johannesburg newsroom 27 11 482 1003, newsroom+reuters.co.za)) ($ - 5.052 South African Rand) ^REUTERS@