I make a popular science video and all the emperors learn from it!

[2. Gold ore. 】

[Gold ore refers to gold-bearing ore mined from mines manually or mechanically, which also contains other metal impurities. 】

[It needs to be beneficiated to become a gold concentrate or gold ore with high gold grade, and then it can be smelted and commissioned to become pure gold and gold products. 】

[Gold is a soft, golden-yellow, ~ corrosion-resistant precious metal. 】

【Development History:】

[From the perspective of the overall development of human society, the 19th century was a very important century. 】

[In the thousands of years of history before the 19th century, humans produced less than 10,000 tons of gold in total, such as only 200 tons of gold in the 100 years of the 18th century. 】

[By the 19th century, gold production had reached a new level, producing 11,500 tons of gold in 100 years, 57.5 times that of the 18th century, of which 10,000 tons were produced between 1850 and 1900.] 】

[After entering the 20th century, in general, the world's gold production generally showed an upward trend. 】

[There have been several occurrences, and the output has increased significantly. 】

[In 1900, the world's gold production was 300 tons per year, in the early 20th century, the highest annual output reached 700 tons, the highest production year in the 30s reached 1300 tons per year, the highest production year in the 60s was close to 1500 tons, the annual world gold production exceeded 2000 tons in the 80s, and the overall output in the 90s of the 20th century was still growing. 】

[Since the 90s of the 20th century, the world's gold production has been relatively stable, and the average world gold production has been stable at about 2,600 tons since the 21st century. 】

【Applications:】

[1. Because of the unique characteristics of gold, people mainly use it as financial reserves, currency, and jewelry;]

[2. Gold serves as a monetary function, such as a measure of value, a means of circulation, a means of storage, a means of payment and a world currency;]

[3. The industrial uses of gold are as follows:]

[Because gold has excellent stability and good electrical and thermal conductivity, it makes gold more and more widely used in the electronics industry. 】

[The development of aerospace technology requires more and more radio electronic components with a high degree of stability, such as coatings for high-grade vacuum tubes, power joints for special purposes, wire-drawn wires for special precision electronic instruments, high-frequency conductors for electroplating gold, and gold alloys for high-temperature welding. 】

[In computers, radios, televisions, tape recorders, etc., manufacturing gold-coated integrated circuits, etc.] 】

[The application of gold in the chemical industryIn the chemical industry, there are also unique uses, such as materials used in nuclear and chemical plants, alloy spinnerets used in man-made fiber factories, etc. 】

[In addition, gold is used in gold-plated infrared devices and heat reflectors used in airplanes and other space vehicles, gold-coated heat shields or heat shields for jet engines and rocket engines, and heat shields coated with thin layers of gold in airplanes, automobiles, ships, and other vehicles.] 】

Gold is also used in traditional industries such as dental prosthesis, photography and pen making. 】

[The application of gold in science and technology is in continuous development. 】

[4. Gold is also used as an investment product by investors in the investment field. 】

【......】

【Distribution:】

[The total reserves of gold on the earth are about 4.8 billion tons, and about 4.7 billion tons are distributed in the earth's core, 86 million tons in the mantle, and less than 100 million tons are distributed in the earth's crust.] 】

As a result, more than 99% of the earth's gold enters the earth's core and is almost impossible to mine. 】

[As of 2005, only 125,000 tons of gold were mined by human beings, accounting for about 1/600 million of the total reserves, and only 20 grams per capita.] 】

Although more than 80 countries in the world produce gold, the production of gold varies greatly from country to country, and the production from place to place is quite uneven. 】

[Among them, the top 10 gold-producing countries in the world in 2004 are: South Africa, United States, Australia, China, and Mao Bear ......]

[China's gold production has always been in the fourth place in the world. 】

【......】

"Gold! continue to form a group, this time to South Africa!"

"What kind of silver to dig for, changed your mind, go to South Africa to pan for gold!"

"That is, the imperial court does not allow us to dig gold, so we go overseas to dig and do it ourselves. "

"If you all go, I will go too, my family has been a merchant for generations, and wherever you are, I will go and sell shovels, hoes, and sacks. "

"My day, profiteer, you really know how to do business, you deserve to be rich!"

"Damn, I'm a blacksmith, wherever you go to pan for gold, I'll go and cast tools for you, and I'll make a fortune!"

"Well, I'll go too, I'll open a liquor store, and I'll settle the bill with the gold you've dug up." "

“......"

The ancient people were excited.

Silver?

That thing dogs don't dig![]

There is gold who digs silver.

Seeing that the opportunity to make a fortune was just around the corner, not only the people were excited, but also the merchants, even the blacksmiths and cooks.

Whoever gets rich, they earn whose money.

Wouldn't it be easy for you to make a fortune!!

Relying on such a nesting doll, a whole group of gold-digging supporting personnel are fully prepared.

Just wait for everything to be ready to go to South Africa to pan for gold. .......... Lose..