“…Lead isotope data indicate that the lead came from a 2.5 Ga source and went through metamorphism and remobilization at 1.6 Ga, concurrent with the Central Plains orogeny. In the search for new gold deposits, Norton (1974) suggested that carbonate-facies iron-formation at the garnet isograd state of metamorphism provides the most favorable environment.…”
“…Lead isotope data indicate that the lead came from a 2.5 Ga source and went through metamorphism and remobilization at 1.6 Ga, concurrent with the Central Plains orogeny. In the search for new gold deposits, Norton (1974) suggested that carbonate-facies iron-formation at the garnet isograd state of metamorphism provides the most favorable environment.…”
“…Department of Interior, 1973, 1974. The estimates of identified subeconomic, hypothetical, and speculative resources, and discussions of their problems, are based on the commodity chapters of Brobst and Pratt (1973).…”
Section: Resource Summariesmentioning
confidence: 99%
“…The same rocks and structures that contain the Homestake deposit continue underneath the younger rocks, and J. J. Norton (1974) has recently proposed testing of the hypothesis that another Homestake-type deposit might be discovered by carefully planned exploration of the buried Precambrian rocks. Total recorded production of the Homestake mine to date is more than 35 million oz.…”
Section: Gold (F S Simons and W C Prinz Inmentioning
“…Most notably, they pointed out that rocks "of Oreville lithology" in the northeast corner of the quadrangle (across the Empire Mine-Keystone fault system) were not necessarily correlative with Oreville-type rocks elsewhere in quadrangle. Norton (1974) correlated the Oreville formation with the Swede Gulch Formation of Bayley (1972) and then correlated the Swede Gulch with the Grizzly Formation of Noble and Harder (1948).…”
Section: Previous Workmentioning
confidence: 99%
“…Redden (1963Redden ( , 1968 Previous workers raised concerns about correlating rocks across multiple faults based solely on lithologic similarity (e.g. Ratte and Wayland, 1969;Norton, 1974;Woodland, 1979;Ratte, 1986). Appendix B summarizes some of the major inconsistencies with previous stratigraphic correlations and their application to ascertaining the regional structure.…”
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.