Porphyry copper, copper skarn, and volcanogenic massive sulfide occurrences in the Chandalar copper district, Alaska
Abstract
Metamorphosed porphyry copper, copper skarn, and volcanogenic massive sulfide (VMS) occurrences have been found in 5 key prospects within Devonian rocks of the Chandalar copper district, Alaska. The Venus, Victor, Eva, and Evelyn Lee prospects contain "proximal" porphyry copper/copper skarn mineralization, whereas the Luna prospect contains "distal" Cu-Zn skarn and Cu-Zn VMS mineralization. Porphyry copper mineralization is recognized by granodiorite composition meta-intrusives; zoned potassic, sericitic and propylitic alteration; and del34S values of -1.5 to -0.6 per mil. Skarns consist of andraditic garnet (Ad30-100) and diopsidic pyroxene (Hd9-46), and have del34S values of -4.7 to -1.1 per mil. Alteration types in intrusive rocks and adjacent skarn are generally compatible. VMS occurrences contain chloritic and silicic alteration, and massive sulfides have del34S values of -0.8 to 6.9 per mil, consistent with values from known Devonian VMS deposits.Description
Thesis (M.S.) University of Alaska Fairbanks, 1990Date
1990-05Type
ThesisRelated items
Showing items related by title, author, creator and subject.
-
The Copper Mountain Project: Financial Analysis and Sustainability Plan for the Copper Mountain Foundation a 501(C)The Copper Mountain Foundation (herein referred to as CMF) is a 501 (c) 3 non-profit that is fully funded, fully operated, and established by The Tatitlek Corporation (herein referred to as TTC). CMF currently has a program that provides scholarships and career grants for original enrollees and descendants of original enrollees of TTC. To be eligible to receive funding, a student must be an original enrollee of TTC or a lineal descendant of an original enrollee (by birth or adoption). Original enrollees of TTC either resided in the Native Village of Tatitlek or their families resided in Tatitlek at the time of enrollment in TTC. Today, scholarship applicants very often continue to come from a rural area within Alaska such as the Village of Tatitlek. The college graduation rate of rural students continues to be one of the lowest in the state. To address this problem, CMF created the scholarship program to offer financial assistance for education and career certificates for the enrollees. The CMF Board of Directors have expressed an interest in creating a Financial Analysis and Sustainability Plan to gain financial sustainability. The financial health of TTC has enabled the programs in CMF to be fully funded. However, securing additional funds diversifies CMF’s financial portfolio making them more financially stable, securing scholarships and career grants for the shareholder and descendants of the TTC. The goal of financial sustainability ensures that the programs will continue at the same rate of funding. The purpose of the Copper Mountain Project was to provide a robust Financial Analysis and Sustainability Plan that would provide the Board of Directors a clear understanding of the financial state of CMF and a guide as they pursued funding endeavors. This final report contains the project methodology used to produce the product, the research methodology used to conduct the research, conclusions about the product and research, and recommendations for further research.
-
Trace element copper distribution and areal geology in a portion of the Clearwater Mountains, AlaskaThe study concerns that portion of the Clearwater Mountains defined by north latitudes 63' 03' and 63' 08' and west longitudes 147' 09' and 147' 30'. Outcrop within the area consists predominantly of a sequence of intercalated andesitic and basaltic flows. Sedimentary rocks are present but comprise a very small percentage of the total section. Dikes and a small pluton are also present. The prevailing attitude of the volcanic and sedimentary rocks is east-northeast with a consistent north dip. A Triassic age is accepted for the volcanic and sedimentary rocks. Areal and local sampling indicates that all rock types are abnormally high in trace copper content, and average background is 1000 ppm. Copper distribution suggests a syngenetic origin. Frequent small copper deposits crop out along the north side of the area. The deposits are epigcnctic and are structurally controlled. The origin of these deposits may have potential exploration significance.
