These rocks consist of gneiss, and gneissic diorite and quartz diorite, intruded by irregular bodies of equigranular granitic rocks, predominantly quartz diorite and granodiorite, with accompanying pegmatite and aplite.
12.
It was also reported that the tin concentrations in " unaltered granitic rocks increase progressively from porphyritic to seriate to some equigranular rocks, indicating a progressive concentration of tin with fractional crystallization . " Cassiterite is found in large quantities in placers enveloping the pluton.
