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Updated: May 12, 2025
In the center of a mass of quartzites that seem lo constitute the upper level of the eruptive grounds of the province, there are found strata of an ore of iron designated as itabirite a mixture of oxide of iron and quartz. These strata are of great thickness, and have numerous outcrops that permit of their being worked by quarrying.
The surface-stone is decomposed by the oxide of iron, and thus the precious dust with its ingrained gold is dissolved and separated from it. At a greater depth the itabirite will be found solid; and the occurrence of these oldest crystalline formations in large layers is a hopeful sign.
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