As of 2026-08-22, San Andreas Fault Observatory at Depth tops the list with 3,200 m.
- #1 San Andreas Fault Observatory at Depth — 3,200 m
deep borehole intersecting the San Andreas fault
The San Andreas Fault Observatory at Depth (SAFOD) was a research project that began in 2002 aimed at collecting geological data about the San Andreas Fault for the purpose of predicting and analyzing future earthquakes. The site consists of a 2.2 km pilot hole and a 3.2 km main hole. Drilling operations ceased in 2007. Located near the town of Parkfield, California, the project installed geophone sensors and GPS clocks in a borehole that cut directly through the fault. This data, along with... Read more on Wikipedia.
Wikidata - #2 LaRonde mine — 3,000 m
gold mine in Quebec, Canada
The LaRonde Mine is a gold mine in the Abitibi-Témiscamingue region 62 kilometres (39 mi) west of Val-d'Or in Quebec, Canada. Read more on Wikipedia.
Wikidata - #3 Holzappel mine — 1,077 m
Lead-zinc mine in Germany
source Wikidata - #4 Chuquicamata — 1,000 m
Chilean mine of copper
Chuquicamata is the largest open pit copper mine in terms of excavated volume in the world. It is located in the north of Chile, just outside Calama, at 2,850 m (9,350 ft) above sea level. It is 215 km (134 mi) northeast of Antofagasta and 1,240 km (770 mi) north of the capital, Santiago. Flotation and smelting facilities were installed in 1952, and expansion of the refining facilities in 1968 made 500,000 tons annual copper production possible in the late 1970s. Previously part of... Read more on Wikipedia.
Wikidata - #5 Důl Ignát — 980 m source Wikidata
- #6 Chlebovice — 948 m
mine in Staříč, Czech Republic
source Wikidata - #7 Samson Pit — 840 m
historical mine in Sank Andreasberg in the Upper Harz, Germany
The Samson Pit or Samson Mine is an historic silver mine in Sankt Andreasberg in the Upper Harz region of central Germany. Read more on Wikipedia.
Wikidata - #8 Mina de Glorianes — 756 m
mine in Glorianes, France
source Wikidata - #9 Mine Rosenhof — 697 m
mine in Germany
source Wikidata - #10 Smolin Mine — 640 m
uranium mine in Ukraine
source Wikidata