Mississippian Sedimentary Rock-hosted Gold Deposits of the Eastern Great Basin: Relative Importance of Stratigraphic and Structural Ore Controls
Brian J. Maher, 1997. "Mississippian Sedimentary Rock-hosted Gold Deposits of the Eastern Great Basin: Relative Importance of Stratigraphic and Structural Ore Controls", Carlin-Type Gold Deposits Field Conference, Peter Vikre, Tommy B. Thompson, Keith Bettles, Odin Christensen, Ron Parratt
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Disseminated gold deposits hosted by sedimentary rocks of Mississippian age are common throughout the central and eastern portion of the Great Basin (Fig. 1). Although these deposits have a wide geographic distribution, the similarities in stratigraphic setting, size, tenor and the spatial distribution of gold and other hydrothermal minerals allow them to be grouped as a subtype of the “Carlin-type” of golddeposit. In particular, the presence of quartz or silica in a basal jasperoid is a characteristic feature of Mississippian sedimentary rock-hosted gold deposits. These deposits also have grade-tonnage relationships and total gold content which differs from the “average” Carlin-type gold deposit. Only three of the Mississippian sedimentary rock-hosted gold deposits studied have the size and grade which allow them to be economically significant in the context of worldwide gold production. While the larger and higher grade deposits share many geologic characteristics with the smaller and lower grade Mississippian sedimentary rockhosted gold deposits, it is apparent that the relative importance of structure and stratigraphy in ore-forming processes varies from deposit to deposit. Such differences are important, especially in the context of designing and executing exploration programs for the deposit subtype.
This paper, an outgrowth of earlier research on the Chert Cliff gold deposit (Vikre and Maher, 1996), describes the Mississippian sedimentary rock-hosted gold deposit subtype and elucidates important differences between the larger and higher grade economically significant Mississippian sedimentary rock-hosted gold deposits and their smaller brethren. The paper will also examine the stratigraphic positioning of individual deposits in space