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AMIS0355,Li 7696 ppm,Ta 207 ppm,Sn 487ppm,Volta Grande,brazil
Origin of Material: The material for AMIS0355 was provided by CIF Mineração S.A. (“CIF”), a subsidiary of AMG Advanced Metallurgical Group N.V. It is from the Volta Grande tantalum, niobium, and tin mine (“Volta Grande”) in Minas Gerais state, Brazil. This mine also produces albite and feldspar products for the ceramic industry as an important by-product of mining. CIF has been mining this deposit for the last forty five years.The Volta Grande pegmatites occur in the Archaean Barbacena greenstone belt on the southern border of the São Francisco craton. The Volta Grande pegmatites form six sub-horizontal tabular bodies characterized by coarse to very coarse-grained spodumene, quartz, albite, microcline, and muscovite.
Mineral and Chemical Composition: The primary orebody consists of quartz, albite, spodumene, zinnwaldite, microcline, and lesser amounts of apatite, garnet, tantalite, microlite and cassiterite.
Recommended Concentrations and Limits1
(at two Standard Deviations)
Li FUS 7696 ± 521 ppm
Li M/ICP 7343 ± 828 ppm
Ta XRF 207 ± 18 ppm
Sn FUS 469 ± 32 ppm
Sn XRF 487 ± 43 ppm
Nb M/ICP 49 ± 6 ppm
Rb FUS 3639 ± 360 ppm
Rb M/ICP 3422 ± 286 ppm
Specific Gravity 2.76 ± 0.12