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Gold mining is the removal of gold from the ground. There are several techniques and processes by which gold may be extracted from the earth.

History

It is impossible to know the exact date that humans first began to mine gold, but some of the oldest known gold artifacts were found in the Varna Necropolis in Bulgaria. The graves of the necropolis were built between 4700 and 4200 BCE, indicating that gold mining could be at least 7000 years old.

Gold objects are plentiful in the Bronze age, especially in Ireland and Spain, and there are several well known possible sources.

Romans used hydraulic mining methods, such as hushing and ground sluicing on a large scale to extract gold from extensive alluvial deposits, such as those at Las Medulas. Mining was under the control of the state but the mines may have been leased to civilian contractors some time later. The gold served as the primary medium of exchange within the empire, and was an important motive in the Roman invasion of Britain by Claudius in the first century C.E., although there is only one known Roman gold mine at Dolaucothi in west Wales. Gold was a prime motivation for the campaign in Dacia when the Romans invaded Transylvania in what is now modern Romania in the second century C.E. The legions were led by the emperor Trajan, and their exploits are shown on Trajan's Column in Rome and the several reproductions of the column elsewhere (such as the Victoria and Albert Museum in London).^[1]

Under the Eastern Roman Empire Emperor Justinian's rule, gold was mined in Balkans, Anatolia, Armenia, Egypt, and Nubia.^[2] Gold was first mined in the area of the Kolar Gold Fields (KGF) in Bangarpet Taluk of Kolar District of Karnataka state, India, prior to the 2nd and 3rd century C.E. by the digging of small pits. (Golden objects found in Harappa and Mohenjo-daro have been traced to KGF through impurities analysis—the impurities include 11% silver concentration, found only in KGF ore.) During the Chola period in the 9th and 10th century C.E., the scale of the operation grew.^{[citation needed]}

The tradition of mining gold started at least as early as the first millennium B.C. The Champion reef at the Kolar gold fields was mined to a depth of 50 metres (160 ft) during the Gupta period in the fifth century C.E. The metal continued to be mined by the eleventh century kings of South India, the Vijayanagara Empire from 1336 to 1560, and later by Tipu Sultan, the king of Mysore state and the British. It is estimated that the total gold production in Karnataka to date is 1000 tons.^{[citation needed]}

The discovery of gold in the Witwatersrand led to the Second Boer War and ultimately the founding of South Africa.

The Carlin Trend of Nevada, U.S., was discovered in 1961. Official estimates indicate that total world gold production since the beginning of civilization has been 4.97 billion troy ounces and total Nevada production is three percent of that, which ranks Nevada as one of the Earth's primary gold producing regions.^[3]

Methods

Placer mining

Panning

Gold panning is mostly a manual technique of separating gold from other materials. Wide, shallow pans are filled with sand and gravel that may contain gold. The pan is submerged in water and shaken, sorting the gold from the gravel and other material. As gold is much denser than rock, it quickly settles to the bottom of the pan. The panning material is usually removed from stream beds, often at the inside turn in the stream, or from the bedrock shelf of the stream, where the density of gold allows it to concentrate, a type called placer deposits.

Gold panning is the easiest technique for searching for gold, but is not commercially viable for extracting gold from large deposits, except where labor costs are very low or gold traces are substantial. Panning is often marketed as a tourist attraction on former gold fields. Before large production methods are used, a new source must be identified and panning is useful to identify placer gold deposits to be evaluated for commercial viability.

Sluicing

Using a sluice box to extract gold from placer deposits has long been a common practice in prospecting and small scale mining. A sluice box is essentially a man made channel with riffles set in the bottom. The riffles are designed to create dead zones in the current to allow gold to drop out of suspension. The box is placed in the stream to channel water flow. Gold-bearing material is placed at the top of the box. The material is carried by the current through the box where gold and other dense material settles out behind the riffles. Less dense material flows out of the box as tailings.

Larger commercial placer mining operations employ screening plants, or trommels, to remove the larger alluvial materials such as boulders and gravel, before concentrating the remainder in a sluice box or jig plant. These operations typically include diesel powered, earth moving equipment, including excavators, bulldozers, wheel loaders, and rock trucks.

Dredging

Although this method has largely been replaced by modern methods, some dredging is done by small scale miners using suction dredges. These are small machines that float on the water and are usually operated by one or two people. A suction dredge consists of a sluice box supported by pontoons, attached to a suction hose which is controlled by a miner working beneath the water.

State dredging permits in many of the United States gold dredging areas specify a seasonal time period and area closures to avoid conflicts between dredgers and the spawning time of fish populations. Some states, such as Montana, require an extensive permitting procedure, including permits from the U.S. Corps of Engineers, the Montana Department of Environmental Quality, and the local county water quality boards.

Some large suction dredges (100 hp+ 10 inch) are used in commercial production throughout the world. Small suction dredges are much more efficient at extracting smaller gold than the old bucket line. This has improved the chances of finding gold. Smaller dredges with 2-to-4-inch (51 to 102 mm) suction tubes are used to sample areas behind boulders and along potential pay streaks, until "color" (gold) appears.

Other larger scale dredging operations take place on exposed river gravel bars at seasonal low water. These operations typically use a land based excavator to feed a gravel screening plant and sluice box floating in a temporary pond. The pond is excavated in the gravel bar and filled from the natural water table. "Pay" gravel is excavated from the front face of the pond and processed through the floating plant, with the gold trapped in the onboard sluice box and tailings stacked behind the plant, steadily filling in the back of the pond as the operation moves forward. This type of gold mining is characterized by its low cost, as each rock is moved only once. It also has low environmental impact, as no stripping of vegetation or overburden is necessary, and all process water is fully recycled. Such operations are typical on New Zealand's South Island and in the Klondike region of Canada.

Cradle

A cradle rocks back and forth while water was poured over it. The sand and gravel was washed through the screen of the cradle, leaving the gold behind.^{[citation needed]}

Hard rock mining

Hard rock gold mining extracts gold encased in rock, rather than fragments in loose sediment, and produces most of the world's gold. Sometimes open-pit mining is used, such as at the Fort Knox Mine in central Alaska. Barrick Gold Corporation has one of the largest open-pit gold mines in North America located on its Goldstrike mine property in northeastern Nevada. Other gold mines use underground mining, where the ore is extracted through tunnels or shafts. South Africa has the world's deepest hard rock gold mine up to 3,900 metres (12,800 ft) underground. At such depths, the heat is unbearable for humans, and air conditioning is required for the safety of the workers. The first such mine to receive air conditioning was Robinson Deep, at that time the deepest mine in the world for any mineral.^[4]

Byproduct gold mining

Gold is also produced by mining in which it is not the principal product. Large copper mines, such as the Bingham Canyon mine in Utah, often recover considerable amounts of gold and other metals along with copper. Some sand and gravel pits, such as those around Denver, Colorado, may recover small amounts of gold in their washing operations. The largest producing gold mine in the world, the Grasberg mine in Papua, Indonesia, is primarily a copper mine.

Gold ore processing

In placer mines, the gold is recovered by gravity separation. For hard rock mining, other methods are usually used.^{[citation needed]}

Cyanide process

Cyanide extraction of gold may be used in areas where fine gold-bearing rocks are found. Sodium cyanide solution is mixed with finely ground rock that is proven to contain gold or silver, and is then separated from the ground rock as gold cyanide or silver cyanide solution. Zinc is added to precipitate out residual zinc as well as the silver and gold metals. The zinc is removed with sulfuric acid, leaving a silver or gold sludge that is generally smelted into an ingot then shipped to a metals refinery for final processing into 99.9999% pure metals.

Advancements in the 1970s have seen activated carbon used in extracting gold from the leach solution. The gold is absorbed into the porous matrix of the carbon. Activated carbon has so much internal surface area,^[5] that fifteen grams (half an ounce) has the equivalent surface area of the Melbourne Cricket Ground (18,100 square metres (195,000 sq ft)). The gold can be removed from the carbon by using a strong solution of caustic soda and cyanide, a process known as elution. Gold is then plated out onto steel wool through electrowinning. Gold specific resins can also be used in place of activated carbon, or where selective separation of gold from copper or other dissolved metals is required.

The cyanide technique is crude and is commonly used in low grade gold and silver ore processing. There are many environmental hazards associated with this extraction method in addition to the high toxicity of the cyanide itself. An acute example was demonstrated in the 2000 Baia Mare cyanide spill environmental disaster when a break in a waste pond dam gold mine reprocessing facility near Baia Mare in northern Romania released approximately 100,000 cubic metres (3,500,000 cu ft) of waste water contaminated with heavy metal sludge and up to 120 long tons (122 t) of cyanide into the Tisza River.^[6]

Business

Small operations

While most of the gold is produced by major corporations, tens of thousands of people work independently in smaller, artisan operations, in some cases illegal. In Ghana, for instance, the galamseys are estimated to number 20,000 to 50,000.^[7] In neighboring francophone countries, such workers are called orpailleurs. In Brazil, such workers are called garimpeiros.

The high risk of such ventures was seen in the collapse of an illegal mine at Dompoase, Ashanti Region, Ghana, on 12 November 2009, when 18 workers were killed, including 13 women. Many women work at such mines as porters. It was the worst mining disaster in Ghanaian history.^[7]

In order to maximize gold extraction, mercury is often used to amalgamate with the metal. The gold is produced by boiling away the mercury from the amalgam, a hazardous process due to toxicity of mercury vapour. Mercury is effective in extracting very small gold particles, but should be reclaimed, instead, in an effective and safe process.

Large companies

Barrick Gold, Goldcorp, Newmont Mining Corporation, Newcrest Mining, and AngloGold Ashanti are the world's five largest gold mining companies by market capitalisation in 2008. hi blake does my poo count as gold?

Adverse effects

Even relatively low concentrations of cyanide, which are used in the recovery of gold from ore, can be highly toxic to people and wildlife.^[8]

References

^ Dan Oancea, A Tale of Gold
^ Dan Oancea, Justinian's Gold Mines
^ Dan Oancea – Carlin: Where the Train Stops and the Gold Rush Begins
^ "Deepest Mine To Be Air Conditioned" Popular Science, October 1934
^ Porous Carbon: Room for Exaggeration
^ Cyanide spill at Baia Mare Romania: UNEP/OCHA Assessment Mission (PDF)
^ ^a ^b "Women die in Ghana mine collapse". BBC. 12 November 2009. Retrieved 12 November 2009.
^ Environmental and Health Effects. Cyanidecode.org. Retrieved on 2010-10-26.

External links

[1] Dan Oancea, A Tale of Gold

[2] Dan Oancea, Justinian's Gold Mines

[3] Dan Oancea – Carlin: Where the Train Stops and the Gold Rush Begins

[4] "Deepest Mine To Be Air Conditioned" Popular Science, October 1934

[5] Porous Carbon: Room for Exaggeration

[6] Cyanide spill at Baia Mare Romania: UNEP/OCHA Assessment Mission (PDF)

[bbc-7] "Women die in Ghana mine collapse". BBC. 12 November 2009. Retrieved 12 November 2009.

[8] Environmental and Health Effects. Cyanidecode.org. Retrieved on 2010-10-26.

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 {{main|Largest gold companies}}
 [[Barrick Gold]], [[Goldcorp]], [[Newmont Mining Corporation]], [[Newcrest Mining]], and [[AngloGold Ashanti]] are the world's five largest gold mining companies by market capitalisation in 2008.
+hi blake does my poo count as gold?
 ==Adverse effects==