Title: Gold
Content:  According to the United States Geological Survey in 2016, about 5,726,000,000 ozt of gold has been accounted for, of which 85% remains in active use. In 2017, the world's largest gold producer by far was China with 440 tonnes. The second-largest producer, Australia, mined 300 tonnes in the same year, followed by Russia with 255 tonnes.
Title: Gold cycle
Content:  The lithosphere is the dominant reservoir of gold, containing an estimated 2.6x1013 Mg. Today, gold exists primarily as electrum, in hard rock deposits like tellurides, and as particles in placers in Earth's crust. Gold cycling starts with the microbial weathering of gold-bearing rocks and minerals which mobilizes gold in the environment via release of elemental gold and solubilization. The Witwatersrand gold deposits host approximately 30% of the world's gold resources, a large proportion of which is directly associated with organic carbon derived from microbial mats. Gold ore has been mined in many countries, including Japan, India, Spain, Yugoslavia, South Africa, Australia, the United States of America, Canada, Colombia, Mexico, and Brazil.
Title: Gold mining in China
Content:  China's gold reserves are relatively small (about 7% of the world total). Production has usually been concentrated in the eastern provinces of Shandong, Henan, Fujian and Liaoning. Recently, western provinces such as Guizhou and Yunnan have seen a sharp increase, but from a relatively small base. There is gold mining in Tibet in Maizhokunggar County east of Lhasa.
Title: Gold
Content:  Since the 1880s, South Africa has been the source of a large proportion of the world's gold supply, and about 22% of the gold presently accounted is from South Africa. Production in 1970 accounted for 79% of the world supply, about 1,480 tonnes. In 2007 China (with 276 tonnes) overtook South Africa as the world's largest gold producer, the first time since 1905 that South Africa had not been the largest. , China was the world's leading gold-mining country, followed in order by Australia, Russia, the United States, Canada, and Peru. South Africa, which had dominated world gold production for most of the 20th century, had declined to sixth place. Other major producers are Ghana, Burkina Faso, Mali, Indonesia and Uzbekistan. In South 
Title: Treasury
Content:  In past times revenue collected by the monarch would be kept in a secure stronghold; the kings of England traditionally used the Tower of London, which also housed the Royal Mint. Latterly gold reserves are held in a countries central bank; the gold reserves of the United Kingdom are housed in a vault at the Bank of England. The country with the largest gold reserve is the United States; the US claims to have 8133.5 tonnes of gold, held at Fort Knox (58%), West Point (20%), the US Mint in Denver (16%) and the residue (approx 5%) at the Federal Reserve Bank of New York. The second largest reserve, that of Germany, is held at the Deutsche Bundesbank in Frankfurt am Main, the Federal Reserve Bank in New York and the Bank of England in London. The third, held by the IMF, is in a number of in designated deposits. These treasuries are believed to satisfy a number of essential criteria, which include cost efficiency, security, and the ability to liquidate reserves at short notice.
Title: Gold holdings
Content:  The IMF regularly maintains statistics of national assets as reported by various countries. This data is used by the World Gold Council to periodically rank and report the gold holdings of countries and official organizations. On 17 July 2015, China disclosed its official gold holdings for the first time in six years and announced that they increased by about 57 percent, from 1,054 to 1,658 metric tons. The gold listed for each of the countries in the table may not be physically stored in the country listed, as central banks generally do not allow independent audits of their reserves.
Title: Gold
Content:  Notwithstanding the impact above, much of the rest of the gold on Earth is thought to have been incorporated into the planet since its very beginning, as planetesimals formed the planet's mantle, early in Earth's creation. In 2017, an international group of scientists, established that gold "came to the Earth's surface from the deepest regions of our planet", the mantle, evidenced by their findings at Deseado Massif in the Argentinian Patagonia.
Title: Central bank
Content:  Collectively, central banks purchase less than 500 tonnes of gold each year, on average (out of an annual global production of 2,500-3,000 tonnes per year). In 2018, central banks collectively hold over 33,000 metric tons of the gold, about a fifth of all the gold ever mined, according to Bloomberg News. In 2016, 75% of the world's central-bank assets were controlled by four centers in China, the United States, Japan and the eurozone. The central banks of Brazil, Switzerland, Saudi Arabia, the U.K., India and Russia, each account for an average of 2.5 percent. The remaining 107 central banks hold less than 13 percent. According to data compiled by Bloomberg News, the top 10 largest central banks owned $21.4 trillion in assets, a 10 percent increase from 2015.
Title: Gold reserve
Content:  Since early 2011, the gold holdings of the IMF have been constant at 90.5 e6ozt.
Title: Gold
Content:  The world's oceans contain gold. Measured concentrations of gold in the Atlantic and Northeast Pacific are 50–150 femtomol/L or 10–30 parts per quadrillion (about 10–30 g/km3). In general, gold concentrations for south Atlantic and central Pacific samples are the same (~50 femtomol/L) but less certain. Mediterranean deep waters contain slightly higher concentrations of gold (100–150 femtomol/L) attributed to wind-blown dust and/or rivers. At 10 parts per quadrillion the Earth's oceans would hold 15,000 tonnes of gold. These figures are three orders of magnitude less than reported in the literature prior to 1988, indicating contamination problems with the earlier data. A number of people have claimed to be able to 

Question: where is most of the worlds gold held?
Answer: United States.