How did the ancients make gold? The ancient gold-making technology was limited by science and technology, and most of them only used high-temperature methods, that is, melting the ore that might be gold ore with a boiler or firewood, and then putting the melted yellow ore solution into the mold with a self-made mold, but the purity was not high.

How ancient gold was made: Ancient gold refining mainly went through five processes: the first process was grinding: first, the ore was put into a water hammer, and the large ore was crushed by hydraulic action, and then it was ground into powder by a stone mill. The second process is elutriation. That is, the ore powder is washed with water to remove the part that does not contain ore, leaving a powder containing more gold and silver, which is called concentrate powder in jargon. The third process is called granulation and sintering. That is, the powder containing gold and silver is mixed with rice to make pellets, which are layered with charcoal to remove sulfur from sulfide and sintered into brittle ore pellets. The fourth process is called lead reduction smelting. Lead in the ore mass is mixed and melted, and chemical replacement is carried out to form lead blocks containing gold and silver. The fifth process is called blowing. That is, lead blocks containing gold and silver are smelted on plant ash, and oxygen is blown in to remove lead from the lead blocks. Blowing off the grass ash can harvest high-purity gold.

Gold futures are also called "gold futures contracts". Futures contracts with gold as the trading object. Like general futures contracts, gold futures contracts also include trading unit, quality grade, term, final maturity date, quotation method, delivery method, minimum price change range, daily price change limit and so on. Gold, as the best safe-haven product, has the following characteristics: 1, security: the value of gold is innate, innate, and has immortal stability for thousands of years. It is recognized as the best value-preserving product in the world. 2. Liquidity: As the gold market is a global 24-hour trading market, it can be traded into paper money at any time. Gold is a financial asset closely related to currency, which has a world price and can also be converted into currencies of other countries according to the exchange rate. 3. Reversibility: The value of gold is inherent. When paper money fluctuates and depreciates due to the credit crisis, gold will automatically adjust upwards according to this currency depreciation ratio. When paper money appreciates, the price of gold remains unchanged, which becomes a means for people to avoid risks in investment, which is another great value of gold investment. 4. Rarity: At present, the global gold stock is about137,400 tons, and the above-ground gold stock is increasing at a rate of 2%. The annual supply of gold is about 4200 tons. At present, due to the rapid development of global industry and jewelry industry, the demand for gold has soared! 5. Investment: Because the long-term trend of gold is upward, and the gold market cannot be manipulated artificially, the risk is small, so gold is a very suitable medium-and long-term investment product, which is different from some speculative financial products.