Samples were orginally analyzed in 1957 for concentrations of Sn and Nb2O5 using spectrographic analysis.% concentration of Nb was derived by the authors and presented in place of % concentration of Nb2O5. Mineral concentrate samples that were not analyzed for Nb2O5 during the initial investigation by Thomas, 1957 were re-analyzed for % concentration of Nb and Ta using semiquantitative x-ray fluorescence.