MONZONITE PLACER ON THE FIRST BROAD RIVER AND ITS TRIBUTARIES, CLEVELAND COUNTY, NORTH CAROLINA

摘要

The First Broad River placer, which is in Cleveland County in southwestern North Carolina, is a flood plain that extends 5.7 miles along the river and contains about 18 million cubic yards of alluvium including about 8 million cubic yards of contiguous sediments in tributary flood plains. Concentrations of monazite are irregularly distributed in the placer. The First Broad River drains 126 equare miles of monazite-bearing rocks upstream form the placer. Bedrock in the placer area is chiefly sillimanite schist and biotite schist of the Carolina gneiss, and locally small sills of Toluca quartz monozonite crop out in some of the tributary streams.