CURRENT UNDERSTANDING OF THE COLES HILL URANIUM DEPOSIT, SOUTHSIDE, VA
The SRA is composed mainly of mylonitic gneiss and amphibolite overlying schist. The CHUD uranium resource as determined in a 2009 Canadian NI-43-101 compliant report is 119 million pounds of U3O8 weight percent at a cutoff of 0.025 weight percent U3O8 and an average grade of 0.06 weight percent. The ore is generally confined to healed hydrothermal fracture zones showing hematite, chlorite, apatite and titaniferous alteration in sodium metasomatised and silica-depleted rock. Sodium metasomatism is marked by rapakivi textures and riebeckite. Hematite represents an oxidation-reduction front associated with deposition of uraninite and pitchblende. The ore has been found to be generally in equilibrium with its daughter products.
The CHUD is composed of apparently two structurally different ore bodies, both northern and southern. It is hosted in the 440 my Leatherwood Granite associated with amphibolite interlayers and is capped by a brecciated zone. Uranium deposition post-dates the granite. The lowest boundary unit and western boundary of both ore bodies is a biotite gneiss or lit-par-lit mylonitic gneiss above the gradational schist of the Fork Mountain Formation. The ore bodies are bounded on their east by the