As of 2026-07-08, 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 Holzappel mine — 1,077 m
Lead-zinc mine in Germany
source Wikidata - #3 Důl Ignát — 980 m source Wikidata
- #4 Chlebovice — 948 m
mine in Staříč, Czech Republic
source Wikidata - #5 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 - #6 Mina de Glorianes — 756 m
mine in Glorianes, France
source Wikidata - #7 Mine Rosenhof — 697 m
mine in Germany
source Wikidata - #8 Grube St. Andreaskreuz — 520 m
mine in Sankt Andreasberg
source Wikidata - #9 Grube Felicitas — 518 m
mine in Sankt Andreasberg
source Wikidata - #10 Grube St. Andreas — 509 m
mine in Sankt Andreasberg
source Wikidata