Now that is a big hole!

The Mir mine (Russian: Кимберлитовая алмазная трубка «Мир» Kimberlitovaya Almaznaya Trubka "Mir"; English: kimberlite diamond pipe "Peace"), also called the Mirny mine, is a former open pit diamond mine, now inactive, located in Mirny, Eastern Siberia, Russia. The mine is 525 meters (1,722 ft) deep (4th in the world) and has a diameter of 1,200 m (3,900 ft),[1] and is one of the largest excavated holes in the world.

It was a valuable hole, too: In the 1960s the mine was producing 10,000,000 carats (2,000 kg) of diamond per year, of which a relatively high fraction (20%) were of gem quality.

https://en.wikipedia.org/wiki/Mir_mine

https://earth.google.com/web/@62.52926745,113.99368608,339.99376422a,10104.15317569d,35y,160.37252093h,0t,0r
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