Unnamed (northeast of Manley Hot Springs Dome) (ARDF #TN110) Cu, Zn

Unnamed (northeast of Manley Hot Springs Dome)

Occurrences, Inactive

Commodities and mineralogy

Main commodities	Cu; Zn
Other commodities	Fe

Geographic location

Quadrangle map, 1:250,000-scale	TN
Quadrangle map, 1:63,360-scale	A-2
Latitude	65.03754
Longitude	-150.70421
Nearby scientific data	Find additional scientific data near this location
Location and accuracy	These occurrences are approximately 1.2 miles northeast of Manley Hot Springs Dome. The site is at the top of hill 2456, at Alaska Division of Geological and Geophysical Surveys (ADGGS) sample station 97RN142A (Liss and others, 1998), in the southeast quarter of section 36, T. 3 N., R. 16 W., of the Fairbanks Meridian. The location is accurate within 500 feet.

Geologic setting

Geologic description Bedrock at these occurrences is locally brecciated, mainly Lower Cretaceous sandstone, shale, and siltstone that has been hornfelsed by the Tertiary Hot Springs granite pluton (Reifenstuhl and others, 1998). The hornfels consists of black, dense rock that contains unoriented crystals or rosettes of muscovite, biotite, and, locally, andalusite. The northwestern contact of the Hot Springs pluton is about 1,000 feet to the south. The breccia may be due to high-angle faulting. Several samples (97KC049A, 97KC049B, and 97RN142A) of gossanous hornfels and breccia on eastern Bean Ridge contained one or more of the following maximum geochemical values: 471 parts per million (ppm) copper, more than 15 percent iron, 4,400 ppm manganese, 162 ppm lead, and 804 ppm zinc (Liss and others, 1998). There is no record of exploration or mining at this site.
Geologic map unit	(-150.706679206139, 65.0370485676582)
Mineral deposit model	Possibly epithermal, polymetallic, or mesothermal veins related to the Hot Springs granite pluton.

Production and reserves

Workings or exploration	Several samples (97KC049A, 97KC049B, and 97RN142A) of gossaneous hornfels and breccia on eastern Bean Ridge contained one or more of the following maximum geochemical values: 471 parts per million (ppm) copper, more than 15 percent iron, 4,400 ppm manganese, 162 ppm lead, and 804 ppm zinc (Liss and others, 1998). There is no record of exploration or mining at this site.
Indication of production	None

References

References Liss, S.A., Reifenstuhl, R.R., Clautice, K.H., Bundtzen, T.K., Newberry, R.J., Dover, J.H., and Blodgett, R.B., 1998, Rock geochemistry from the Manley mining district (Tanana A-1 and A-2 quadrangles with some samples from adjacent quadrangles): Alaska Division of Geological & Geophysical Surveys Public Data File 98-39, 41 p., 1 DVD. Reifenstuhl, R.R., Dover, J.H., Newberry, R.J., Clautice, K.H., Pinney, D.S., Liss, S.A., Blodgett, R.B., and Weber, F.R., 1998, Geologic map of the Tanana A-1 and A-2 quadrangles, central Alaska: Alaska Division of Geological & Geophysical Surveys Public Data File 98-37A v. 1.1, 19 p., 1 sheet, scale 1:63,360.
Reporters	D.J. Szumigala (ADGGS)
Last report date	5/24/2004