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Max Gregg White

Publications and source records attributed to Max Gregg White.

At least 19 recordsLinked to original sources
USGS1975

Aluminum resources of Brazil

Large deposits of bauxite, the principal ore of aluminum, occur at several places in Brazil. The largest deposits now undergoing extensive exploration and development are in the eastern Amazon Basin. Most of these deposits are in the State of Para, but some are in Amazonas and Maranhao. Discovery of large-scale resources of bauxite in the Amazon Region is so recent that mining has not begun, but government geologists estimate the total resources in aluminum deposits in the lower Amazon to be in the multibillion ton range. The annual production rate of bauxite ore in Brazil, much of it from Pops de Caldas in Minas Gerais, is about 760,000 metric tons of ore from which about 100,000 tons of aluminum metal is produced, most of which is consumed by Brazilian industry. The Amazon bauxite deposits are on terraces formed on sedimentary rocks of Tertiary age; in Minas Gerais the deposits are formed on Precambrian metasedimentary rock, and at Poos de Caldas on a circular alkalic pluton of Cretaceous age.

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USGS1974

Tungsten resources of Brazil

Brazilian tungsten production, 85 percent of which is exported, comes almost entirely from scheelite-bearing tactites in northeast Brazil, and has reached an annual rate of about 2,000 metric tons (2,200 short tons) of scheelite concentrate with 70 percent WO3. Scheelite ore reserves, located principally in the State of Rio Grande do Norte, are estimated to be as high as 8,300,000 tons (9,100,000 short tons) containing 0.7 percent WO3. Minor deposits (or those about which only minimal information is available) of wolframite, with which some cassiterite is associated, are located in Sao Paulo, Santa Catarina, and Rio Grande do Sul. Both the scheelite and the wolframite deposits are considered . to be late Precambrian A (620 to 900 m.y.) or early Cambrian in age.

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USGS1974

Tin resources of Brazil

Annual tin production in Brazil, most of it from cassiterite placer deposits in Rondonia Territory, amounts to about 4,000 metric tons (4,400 short tons) of concentrate containing 66 percent tin, much of which is consumed by Brazilian industry. Reserves of cassiterite concentrate in the placers of Rondonia district are estimated at about 160,000 (176,000 short tons) containing 66 percent tin. Extensive undiscovered resources of cassiterite possibly exist in southern Rondonia Territory and to the east of the Territory in northern Mato Grosso, southern Amazonas, and southern Para. Numerous occurrences have been reported in these regions and as far to the east as the headwaters of the Tapajos and the Xingo Rivers. Minor deposits or occurrences of cassiterite (or lode deposits about which there is only minimal information available) are located in Para, Amapa, Paraiba, Rio Grande do Norte, Ceara, Bahia, Minas Gerais, Goias, Sao Paulo, and Rio Grande do Sul. All the lode tin deposits are dated or enclosed in rocks that date as Precambrian B (900 to 1,300 m.y.).

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