Tin-tungsten lodes from the Eastern Desert of Egypt are described. "The veins traverse metamorphosed rocks, diorites and gray granites that lie in the neighborhood of a mass of pegmatitic granite. The mineral contents of the veins as well as their wall rock alterations are described and they indicate that the ore fluid left the magma in an alkaline condition and continued alkaline until a gas phase was formed when the temperature-pressure balance was interrupted along the fracture lines. When this interruption was finished the fluid became alkaline again. The deposit presents some vertical and horizontal zonal arrangements of minerals."

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