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We know the strengthening dollar its having some detrimental effects but the figures here seem a bit askew ?
At AU$13, tell me where to stand at the gate for some?
Not the price, "the price rise".
We know the strengthening dollar its having some detrimental effects but the figures here seem a bit askew ?
At AU$13, tell me where to stand at the gate for some?
April 2011
"The World’s Top Ten Gold Mines"
Bill Haynes
www.minesite.com/aus.html (The registration is free)
Gold has long been one of mankind’s most prized possessions. Yet most people have little idea where gold comes from, other than from “gold mines.” Mining gold today often involves monumental undertakings, truly some of man’s greatest engineering feats. Imagine gold mining shafts nearly two and a half miles below the surface and it taking two hours for miners to get to their work stations. Imagine a pit so large that it can be seen from outer space. No reason to imagine, those are the realities in the mining of gold revealed in “The World’s 10 Most Prolific Gold Fields.”
1. Witwatersrand Basin (Johannesburg, South Africa). Located in South Africa, the Witwatersrand Basin represents the richest gold field ever discovered. It is estimated that 40% of all of the gold ever mined has come out of the Basin. In 1970, South Africa’s output accounted for 79% of the world’s gold production. By 2009, South Africa’s share of world gold production had dropped to less than 8%. Mining in the Witwatersrand Basin is accomplished by creating deep underground tunnels that are necessary to reach the plentiful reserves. The Tau Tona Mine features the deepest tunnel in the world extending a full 2.4 miles below the earth’s surface. A massive ventilation and air conditioning system is required to overcome the extreme working conditions throughout more than 500 miles of tunnels. At its deepest levels, the air temperature reaches 131 degrees farenheit and the rock face itself 140 farenheit. The mine is so extensive that it takes workers a full two hours to travel from the surface to the deepest sections of the mine where they must then contend with pockets of lethal gas, water and a continual barrage of small earthquakes. The discovery of gold in the Basin in 1886 by Australian miner George Walker set off one of the largest gold rushes in history. The surrounding area became the city of Johannesburg, and within ten years Johannesburg was the largest city in South Africa.
2. Carlin Trend (Nevada, US). For over a hundred years, prospectors in the Western US completely missed one of the richest gold fields in the world, as it contained what is now popularly called ‘invisible gold.’ Historically, most gold fields were discovered by the presence of gold veins or deposits visible to the naked eye. Not so in the Carlin Trend located in northeast Nevada. Hot springs containing dissolved gold deposited the metal into the sediment in such fine particles that it is difficult to see even with a microscope and impossible to find using older conventional methods such as hand tools and panning. In 1961, John Livermore, a geologist for Newmont Mining, set out in search of this invisible gold based on some ideas in a paper published a year before by noted geologist Ralph Roberts. It didn’t take long before Livermore found what he was looking for in an area that is now known as the Carlin Trend. The deposit was the first major one of its kind discovered. Subsequent discoveries of similar type areas in China and Macedonia are referred to as Carlin Trend type deposits. Mining by Newmont began in 1965; the area has since become one of the richest gold fields in the world. Open pit mining dominates the Carlin Trend over its five by 40 mile area although some underground operations have been formed in higher grade areas. Gold production in the state of Nevada, which is dominated by the Carlin Trend, accounts for almost 80% of the gold mined in the United States. If Nevada were a country, it would rank #4 in the world in terms of total gold production.
3. Irian Jaya (Indonesia). In one of the most inaccessible spots on the planet lie the single largest gold orebody and third largest copper orebody ever discovered. Located in the mountains of Irian Jaya, Indonesia, at an elevation of 14,010 ft, is the Grasberg Mine. Two miles away lies its predecessor, the Ertsberg Mine. The amazing feat of their construction by Freeport McMoRan is the subject of an episode of Discovery Channel’s Super Structures. Work on the original Ertsberg Mine began in 1967 with the construction of a dock and a 25 mile road through the surrounding jungle. Chainsaw-wielding workers were lowered from helicopters to cut their way clear to the jungle floor. Bulldozers were flown in where they often had to contend with 20 feet of soft marshland before reaching solid ground. The final section of mountain road was built atop a ridge so narrow that the first clearing pass had to be done with bulldozers no bigger than riding lawn mowers. Six subsequent iterations of air lifting increasingly larger bulldozers were used to complete the road. A tram system had to be built to surmount the final 2,000 foot cliff that separates the road from the mine site. Getting the mined ore off of the mountain is a much more efficient process: it is simply dropped 2,000 feet to the giant crushers below. The processed ore is mixed with water to create a gold and copper slurry which travels through 70 miles of pipe out to the shore. From there, the slurry is concentrated and the ore then transported to smelters around the world. The original Ertsberg Mine operated from 1972 until it was depleted in the mid 1980s. In 1988, Freeport McMoRan discovered the enormous neighboring ore body that is today operating as the Grasberg Mine. Gold production was 2.5 million ounces in 2009. Open pit operations will continue through 2015 at which point the gold will be mined by underground methods.
4. The Super Pit (Kalgoorlie, Western Australia). The Super Pit, located in Kalgoorlie, Western Australia, is the largest open pit mine in the country. It covers an area of almost three square miles and is large enough to be seen from space. The excavation began after several underground mines were acquired by Kalgoorlie Consolidated Gold Mines. Even today, operations occasionally unearth old mining tunnels complete with abandoned mining equipment. The Super Pit covers an area known as the Golden Mile, a name that dates back to the original gold rush of the late 19th century. During this time, the field was considered to be the richest square mile in the world. The area has been continually mined for over 100 years, and the Super Pit is expected to remain in production through at least 2017. Once retired, the mine will be allowed to fill in with ground water, a process that could take 50 years. The city of Kalgoorlie was formed in 1893 right after Irishman Paddy Hannan filed a Reward Claim leading to an influx of hopeful prospectors. The subsequent gold rush saw the surrounding area boom over the next 10 years, temporarily reaching a population of almost 200,000. It was during this time that Kalgoorlie’s famous Hay Street brothels began. Much like the mine, they have also been in continuous operation for over a century and are now an accepted part of the community. Today, Kalgoorlie has a population of less than 30,000 with about one fourth of its jobs directly related to mining.
5. Yanacocha (Peru). Located high in the Andes Mountains, with parts reaching elevations in excess of 13,000 feet, is the sprawling complex known as Yanacocha. Covering some 60 square miles, it is the largest gold mine in Latin America, possibly the second largest in the world, and is recognized as one of the most profitable in the world. Yanacocha is the largest facility operated by Newmont Mining and is the company’s crown jewel. With almost US$2 billion dollars invested in the mine, Newmont has received a return of over US$7 billion to date. In 1994, a legal battle for Yanacocha erupted between Newmont Mining and its French partner BRGM, after BRGM attempted to sell its stake to a Newmont rival. A controversial decision by the Peruvian high court allowed Newmont and its Peruvian partner Buenaventura to buy out BRGM’s stake. The aftermath was ugly with both sides accusing one another of engaging in improper conduct in attempting to influence the decision. Since its origins in 1993, Yanacocha has produced more than 26 million ounces of gold.
[Note: The post had to be shortened to five mines because of ASF size requirements]
This article first appeared on Bill's Blog on The CMI Gold & Silver website.
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