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Geology, search and prospecting of mineral deposits

Nickel-containing iron oxides in the Buruktal deposit, South Urals

S. O. Ryzhkova1
I. V. Talovina2
V. G. Lazarenkov3
N. I. Vorontsova4
V. L. Ugolkov5
  • 1 — Saint-Petersburg State Mining Institute (Technical University)
  • 2 — Saint-Petersburg State Mining Institute (Technical University)
  • 3 — Saint-Petersburg State Mining Institute (Technical University)
  • 4 — Saint-Petersburg State Mining Institute (Technical University)
  • 5 — Institute of Silicate Chemistry of RAS
Date submitted:
Date published:


In the Buruktal supergene nickel deposit, iron oxides possess vertical mineralogical zoning (bottom-up): magnetite-maghemite-goethite-hematite. The main rock- and ore-forming mineral in the iron-oxide zone of the deposit is magnetite, presented by three generations: primary relic magnetite, surviving from ultramafic rocks; secondary magnetite, forming at serpentinization process and neogenic supergene magnetite. Supergene magnetite, like a goethite, is nickel ore mineral, containing about 1 % NiO. Under the complex thermal analysis data, maghemite-magnetite and goethite have two main diagnostic maximums: exothermal effect of magnetite, caused by magnetite oxidation to maghemite in the interval 317‑340 °С, displays maximum at 327 °С («magnetite» point), and endothermic effect of goethite, connected with loss of constitutional water of the mineral and its transition to hematite in the interval 269‑296 °С, displays maximum at 288 °С («goethite» point).

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