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Gold medals can be won or lost within fractions of seconds; Bradley Wiggins' bike frame is made of 'nanoalloy carbon', Andy Murray uses a graphite tennis racket and Jessica Ennis' running spikes use the latest carbon and nano-ceramics technologies. However, the technologies used to mine and process the metals used for winners' medals have been around for much longer, but which countries dominate the production of gold, silver and bronze? The metals used to produce the medals at theA London 2012 Olympic and Paralympic Games were exclusively provided by Rio Tinto; from its mines in Australia, Mongolia and the USA. Gold (Au) is a precious metal and has been mined since the ancient Egyptian times; whilst smelting and fusing of gold-rich ores has been reported since 3600 BC. Gold occurs in many different rock types and geological environments and economic deposits are mainly of two types: lode deposits and placer deposits.
Depending on the geological setting of a deposit, gold is extracted by open pit or underground mining methods.
Following extraction, ore goes through crushing and grinding stages and appropriate size ore particles are then fed into the cyanidation process, which is responsible for extracting gold from the ore.
Gold extracted from the ore is purified by smelting and gold is moulded into bars known as doré.
Over 90 countries now produce gold worldwide and there are several additional small operations that produce substantial amounts of gold, but these figures are not commonly recorded in official statistics (for example, artisanal mining). According to the BGS world mineral production data, the production figure for gold in 2010 was nearly 2.3 million kg (metal content). China remains the largest producer of gold with a 14 per cent share of the global production. According to the World Gold Council, the value of gold has increased by 120 per cent over the last three years.
The jewellery market is perceived as the major consumer for gold (approximately 59 per cent of the world production), but it is not the only market. Gold is also recovered from secondary sources, such as high-grade scrap jewellery and scrap dental appliances, or lower grade scrap from electronic waste. Silver is mined from lode and placer deposits and is often co-mined with gold and suphide ores (copper, lead and zinc). Silver is produced from approximately 60 producers worldwide, with Mexico being the lead producer. Overall, silver mine production rose significantly over the last few years and in 2011 demand for silver reached its second highest level since 20001.
Silver is used in industrial applications, in jewellery and silverware, in coins and medals and has a strong presence in the investment market.
Silver use in industry and technology has shown a significant increase in recent years and it now represents the major end user.


A variety of silver investment options exist and they have presented a significant growth over the last few years. Silver is found in various waste streams, such as waste from electrical and electronic equipments (WEEE), scrap metals, spent catalysts, jewellery and silverware waste, spent plating solutions and photographic waste. Processes for recovering silver are well established for certain waste materials (e.g photographic waste and jewellery scrap) and continues to improve for newer streams, such as WEEE. Bronze is a copper and tin alloy, but the term is also used for a variety of copper alloys, some of which do not contain tin at all. The use of bronze has been reported since the earliest Mesopotamian and Egyptian civilisations in the manufacture of tools and weapons.
Copper is a semi-precious metal and some of its key characteristics include ductility, malleability, thermal and electrical conductivity, resistance to corrosion and antimicrobial characteristics. Other elements, such as phosphorus, aluminium, lead, nickel and others are often added to produce an extensive range of bronze alloys that find application in different end uses. Chile represents the largest producer of copper, whilst China accounts for approximately 50 per cent of world tin production. Bronze is used in a number of products, including bearings, springs, bushings, steam pressure castings, automobile transmissions, clips, for ornamental uses, in musical instruments and medals. Copper and copper alloys such as bronze are widely recycled and production of secondary copper from scrap accounts for two thirds of total copper production. Recycling includes the collection; segregation and melting of scrap metal in smelters most of the time, but modification to the above processes may occur if scrap of lower purity is collected.
Well, that rumor seems to have turned out true, and the first photo of that variant has arrived.
The Samsung Galaxy Note 7 is one of the first smartphones on the market to come equipped with Gorilla Glass 5. Newly leaked images of the Nexus Sailfish have shown up, giving us our first real look at the design of the upcoming Nexus. Samsungn Galaxy Note 7 units are shipping, with numerous reports coming in from T-Mobile and Verizon faithful that shipping numbers are going out.
Samsung has started rolling out an update to the Galaxy S7 and Galaxy S7 Edge that not only brings the latest security patches, but also introduces users to Samsung Cloud. Google has officially announced the rollout of their newest video calling application, Duo.
The Gorilla Glass 5 used on the Samsung Galaxy Note 7 may be more resistant to shattering, but a durability test shows that it’s only slightly more scratch resistant than plastic.
Samsung opted to include an iris scanner into the Galaxy Note 7 but that has led to the question of whether it’s a better overall option than the fingerprint scanner.


Donning a sparkly silver sequinned dress later in the night, the singer took the opportunity to speak to her fans about her music. She subsequently moved to the piano to perform the emotional ballad, Nobody, and Hillsong United’s Transfiguration. However, Figure 1 clearly demonstrates that gold is produced by numerous countries in significant quantities, which makes it a global commodity. The investment sector has presented a significant growth, but demand from the jewellery and technology sectors has also contributed to recent high gold prices. The investment sector and central bank reserves are also key markets for gold (around 29 per cent of the world production). Silver is soft and ductile; due to these properties silver is used in several applications including jewellery and various industrial uses. Zinc concentrates are roasted and the silver-rich calcine residue is sent to a lead smelter for further processing. This is due to its long-lasting value, wealth and the provision of stability in comparison to other investment outlets, such as stocks.
Bronze contains around 90 per cent copper and up to 10 per cent tin, occasionally more depending on the end use. Although Chile accounts for a significant share of the global production, copper deposits are dispersed around the world.
Scrap bronze is collected from processing residues (slag, drosses, fines) and post-consumer waste (end of life vehicles, construction and demolition waste, waste electrical and electronic equipment or WEEE).
The recovery of gold from secondary sources is often governed by the market trends and price of gold metal. The ore goes through various stages of comminution, followed by froth flotation, where metal concentrates are collected.
Tin deposits on the other hand are concentrated in East Asia and South America, with Australia being the only other producing country. It looks rather big for that purpose, but we imagine there will be some sort of adapter you can use to get a good fit.



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