Anniversary of the commencement of the sg-3 Kola superdeep borehole drilling operations

The presented article reviews the history of drilling deepest well in world, located northeastern part Early Proterozoic Pechenga structure (Kola Peninsula). In 1990, Kola Superdeep Borehole (SG-3) reached a record depth 12,262 m. SG-3 fully completed all assigned tasks, both technical and scientific terms. 4024 linear meters core were extracted, including drill samples from depth. Overall, whole complex logging geophysical works with total length 400 thousand km was performed through use 25 methods. This allowed obtaining latest information on composition deep horizons earth's crust, which qualitatively changed data previous seismic studies. Also, emerging chemical mineral composition, as research physical properties rocks, proved presence ore mineralization metal-bearing hydrothermal systems. at its uncovered new bodies copper-nickel ores; six types have been identified throughout section borehole. High permeability for fluids solutions zones crust established, is associated increased porosity rocks fracturing. It also that earliest Precambrian metasedimentary formed active participation biological processes. analysis deep-hole experience allows author to confirm status artificial point Earth.