I just came across a pretty interesting question: how much is the total amount of gold in the world? At first glance, it should be an astronomical number, but the answer might surprise you.

According to statistics from the World Gold Council, the total amount of gold mined by humans throughout history is about 212,582 tons. It sounds like a lot, but if you melt all that gold and cast it into a cube, each side would only be about 73 feet long. To put it another way, the total gold in the world could actually fill four and a half Olympic-sized swimming pools. That’s all the gold we’ve mined over thousands of years.

Interestingly, two-thirds of this gold was mined after 1950. This shows that modern mining technology has indeed improved extraction efficiency. Now, the mining industry extracts about 2,500 to 3,000 tons of gold annually.

But how much gold is still underground? The U.S. Geological Survey estimates that the known economically recoverable reserves are about 57,000 tons. It sounds like a lot, but the problem is that a large amount of gold remains buried deep underground and cannot be mined with current technology. Scientists estimate that the total amount of unrecoverable gold could be as high as 400k tons. Not to mention, within the Earth’s molten metal core, there may be as much as 16 trillion tons of gold, which is beyond our extraction capabilities.

Here’s a fun fact: about 20 million tons of gold are suspended in the oceans. It sounds like a huge fortune, but according to NOAA data, every 100 million tons of seawater in the Atlantic and North Pacific contains only about 1 gram of gold. This means gold is so dispersed that there’s currently no economically feasible way to extract it.

Ultimately, the reason gold is so valuable is because it’s scarce. The total amount of gold in the world may seem substantial, but relative to human needs and the Earth’s scale, it’s actually quite limited. This also explains why gold has been regarded as a symbol of wealth for thousands of years.