James Constantopoulos, Peter B. Larson; Oxygen and hydrogen isotope geochemistry of the Star-Morning mine, Coeur d'Alene mining district, Idaho. Geology ; 19 (2): 131–134. doi: https://doi.org/10.1130/0091-7613(1991)019<0131:OAHIGO>2.3.CO;2
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Oxygen isotope values of vein quartz from the Star-Morning mine range from 13.2‰ to16.2‰ relative to standard mean ocean water. Calculated isotopic values of water in equilibrium with the vein quartz at 325 °C range from 7.2‰ to 10.2‰. The δ18Oquartz values decrease with depth in the mine. The δD values of quartz inclusion fluids range from -18‰ to -105‰ and do not significantly correlate with depth. Oxygen isotope values of Belt Supergroup wholerock samples range from 13.8‰ to 16.8‰. The data indicate that the fluids were a mix of metamorphic water released from the Belt rocks during low-grade metamorphism, and 18O-shifted meteoric water.