Today, Vale doesn't have a dry stacking operation that can deal with the production quantity especially in a region with high rainfall indices, such as the Ferriferous four-side  in Minas Gerais.
 Ferriferous four-side refers to an area in the central region of Minas Gerais.
The top two highest ferriferous mineral element contents (3.39% and 3.14% [Fe.sub.2][O.sub.3]) in Table 2 are the main cause of obvious absorption valleys of 700 nm and 870 nm bands of carbonaceous shale (d) and bituminite (c) [27, 28].
Absorption band (nm) Major related interactive process 1 400, 430, 450, 490, [Fe.sup.2+] and [Fe.sup.3+] in 510, 520, 550 ferriferous minerals 2 700 [Fe.sup.3+] in ferriferous minerals 3 870 [Fe.sup.3+] in ferriferous minerals 4 1000-1100 [Fe.sup.2+] in ferriferous minerals 5 1400 OH- vibrations in clay minerals 6 1900 H2O vibrations in milky quartz 7 2200 Al-OH vibrations in clay minerals 8 2300-2500 Overtones and combinations of organic absorption groups No.
Using an initial mixture 60% Si[O.sub.2]: 15% [B.sub.2][O.sub.3]: 5% [Na.sub.2]O: 20% [Fe.sub.2][O.sub.3] (pointed out the molar percentages) we have prepared four types of ferriferous
alkali borosilicate glasses.
Other potential minerals affecting the MS of the studied strata are ferriferous
glauconite, iron ooids and ferroan dolomite.
(1984) and Delmont (1985) emphasised the association of celadonite with a black ferriferous
saponite from veins developed in marine volcanic rocks.
The "Quadrilatero Ferrifero" (Ferriferous
Quadrilateral) region is regarded as a conservation priority area with special biological importance that demands urgent scientific investigation, due to its plant and amphibian endemisms, richness of vertebrate species, and also because these ferruginous fields are a unique environment (Drummond et al., 2005).
Cytological research of the ferriferous
device oviduct of the hens.
Therefore on the next stage we have studied the morphology and magnetic properties of these ferriferous
alkali borosilicate glasses and their convenience for preparation of magnetic porous glasses (MPG).