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

Pavel B.Sokolov                            "FIP-BIS" Ltd., St.Petersburg.
                                                     (Sampling, Discussion)

Eric V.Tabuns                               St.Petersburg State University, St.Petersburg.
                                                     (Sampling, Discussion)

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