|Quadrangle map, 1:250,000-scale||DN|
|Quadrangle map, 1:63,360-scale||C-2|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This occurence is at an elevation of about 2650 feet in lower Ruby Creek, a tributary of Yellow Creek. It is in the SE1/4 NW1/4 section 3, T. 16 S., R. 17 W., Fairbanks Meridian. The location is accurate within 300 feet. The occurrence represents the location of rock sample 209 of Hawley and Associates (1978), and appears not to have been described previously.|
Geologic descriptionA major fault that strikes NNW controls the course of Yellow Creek; strata to the east are apparently downthrown. This occurrence is in quartz schist in marble of the Spruce Creek sequence in the downthrown block. (Bundtzen, 1981; Hawley and Associates, 1978; Thornsberry, McKee, and Salisbury, 1984, fig. K-2). The occurrence consists of altered quartzite that contains galena and pyrite. A representative chip sample of mineralized quartz schist contained 1.8 percent lead, 60 ppm silver, and 0.3 ppm gold (Hawley and Associates, 1978, sample no. 209). Stream-sediment samples (nos. 202 and 203) collected upstream of the locality are weakly anomalous in lead, zinc, and silver.
|Geologic map unit||(, )|
|Mineral deposit model||Polymetallic replacement deposit (Cox and Singer, 1986; model 19a).|
|Mineral deposit model number||19a|
|Age of mineralization||The deposit is assumed to be Eocene (see record DN091).|
|Alteration of deposit||Silicified and sulfidized quartz schist in marble.|
|Workings or exploration||Hawley and Associates (1978) collected rock and stream-sediment samples in 1976. There are no workings.|
|Indication of production||None|
Additional commentsThe occurrence is in Denali National Park and Preserve.
Bundtzen, T.K., 1981, Geology and mineral deposits of the Kantishna Hills, Mt. McKinley quadrangle, Alaska: M. S. Thesis, University of Alaska, College, Alaska, 238 p.
Cox, D.P., and Singer, D.A., eds., 1986, Mineral deposit models: U.S. Geological Survey Bulletin 1693, 379 p.
Hawley, C. C. and Associates, Inc, 1978, Mineral appraisal of lands adjacent to Mt. McKinley National Park, Alaska: U. S. Bureau of Mines Open-File Report 24-78, 275 p. (paged by sections).
Thornsberry, V. V., McKee, C. J., and Salisbury, W. G., eds, 1984, 1983 Mineral Resource Studies: Kantishna Hills and Dunkle Mine Areas, Denali National Park and Preserve, Alaska: U. S. Bureau of Mines Open-File Report 129-84. 3 Volumes: v. 1, Text; v. 2, Appendices; v. 3, Maps. Prepared by Salisbury & Dietz, Inc., Spokane, WA.
|Last report date||5/1/2001|