10. Chuquicamata copper mine in Chile
Located 250 kilometers northeast of Antofagasta, Chile, with an altitude of 2800 meters, it is an open-pit mine. It is the oldest copper mine in Chile, with a depth of 850 meters. Although it is not the mine with the largest copper reserves in the world, it is the mine with the largest copper production in the world.
9. Udachinaya diamond mine in Russia
This is a diamond mine, which was discovered in 1955 and has been excavated to a depth of 600 meters. It is reported that the mine owner plans to stop mining next year.
8. Guatemalan cesspool cave
In 2007, Guatemalan suddenly collapsed, and more than a dozen houses fell into a 300 foot deep cesspool hole, killing two people and forcing thousands to evacuate the area. The collapse of the sewage pool was caused by the flow of rainwater and underground sewage.
7. Davick diamond mine, Canada
Located in the northwest territory of Canada, the dyvik diamond mine was first mined in 2003 and can produce 8 million carats or 1600 kg of diamonds per year. The dyvik diamond mine is now an open pit mine and underground production is planned to start early next year. By 2012, davick expects open-pit mining to stop, by which time davick will become a completely underground mine.
6. Russia Siberia mill diamond mine
It is one of the earliest and largest tubular diamond mines in the former Soviet Union (the pit is 525 meters deep and 1200 meters in diameter), and has been abandoned. It is said that when the mine is in operation, it takes two hours for a truck to drive from the bottom to the top of the mine.
5. Honduras Blue Hole
There is an underwater hole called "Blue Hole" near Belize, Honduras. The hole is 1000 feet in diameter and 400 feet deep. It is a limestone pit formed at the end of the ice age. Located in a mysterious underwater cave surrounded by ghostly sharks, Honduras Blue Cave is like a magic magnetic field, which strongly attracts brave diving enthusiasts from all over the world to experience and make it one of the most famous diving holy places in the world.
4. Bingham Canyon copper mine, Utah, USA
Bingham Canyon copper mine is located in OAKER mountains, Utah. The mine is 1200 meters deep and 4000 meters wide. This is currently the largest man-made mine in the world.
3. Monticello dam, California, USA
Monticello dam is located in greenpark County, California, USA. It is a large-scale circulating spillway in the United States. It can discharge 48400 cubic feet of flood per second.
2. Kimberley diamond mine, South Africa
Kimberley diamond mine is considered to be the world's largest manual excavation mine. From 1866 to 1914, 50000 miners used shovels and other tools to excavate, and a total of 2722 kg of diamonds were excavated. It is reported that the Kimberley pit is likely to be listed as a world heritage site.
1. Dawaz gas tunnel in Turkmenistan
In the early 1970s, geologists discovered a mysterious cavern near Dawaz, a small town in southern Ukraine. There is a large amount of underground natural gas in this area. In the process of perennial exploitation, due to the accidental annular collapse of drilling, this extraordinary large cavern was formed. In order to prevent the toxic gas from overflowing, the local government decided to burn the natural gas in the hole, and sent the drillers to ignite the gas in the hole. It was from then on that the fire at the entrance of the cave continued to burn for more than 30 years, and has never stopped until now. It is known as the "gate of hell". At present, "gate of hell" has become a famous tourist attraction.
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