Anver M.Akhmedov  D.Sc.:           All-Russia Geological Institute, St.Petersburg.
                                                     (Sampling, Geological stuty)

Vladimir V.Knauf  Ph.D.:                NATI Research JSC., St.Petersburg.
                                                     ("PPM-mineralogy", Geological stuty)

Valery A.Krupenik  Geologist:        All-Russia Geological Institute, St.Petersburg.
                                                     (Sampling, Geological stuty)

With assistance:
M.D.Tolkatchev, M.R.Pavlov, N.S.Rudashevsky - microprobe analyses. Our acknowledgments!