Geology of Uranium Lake City, Cinch Mines, Saskatchewan

CIM Bulletin, 1965

A. Turek Department of Geology, University of Alberta

The Lake Cinch deposit occurs in the Tazin gneisses on the footwall side of the Black Bay fault. Ore is localized by two faults, the Main Ore fault and the Crackingstone River fault, occurring in shoots along the former and on tension fractures between the two faults. Faulting leading to the localization of the deposit is analyzed in detail and tied into the regional pattern. Pitchblende, the chief radioactive mineral, is investigated by X-ray and found to be of very small particle size. The relationships of U, Fe and Mn in the ore are established quantitatively, and Fe is found to bear a catalytic relation to U. The deposit is classed as belonging to Lindgren's mesothermal class. Mineralization is attributed to carbonate solutions, and the uranium is believed to have been transported in the hexavalent state as the uranyl tricarbonate ion; analogy is drawn to a recently developed hydrometallurgical technique for the production of uranium dioxide.
Keywords: calcite, hematite, Main Ore fault., pH, The Chemical Environment of Pitchblende, Deposits, Fault, Faults, Fracture, Fractures, Ore, Ores, Pitchblende