Reference | {Deposit:: PARDEE, J. T. AND J. C. SCHRADER, 1933, METALLIFEROUS DEPOSITS OF THE GREATER HELENA MINING REGION, MONTANA, USGS BULL. 842 P. 227-232}{Deposit:: KNOPF, A., 1913, ORE DEPOSITS OF THE HELENA MINING REGION, MONTANA USGS BULL. 527 P. 102-107}{Deposit:: STONE, R. W., 1910, GEOLOGIC RELATION OF ORE DEPOSITS IN THE ELKHORN MOUNTAINS, USGS BULL. 470.} |