Unnamed (Rampart road, lower Minook Creek) (ARDF #TN055) Cu

Unnamed (Rampart road, lower Minook Creek)

Occurrence, Inactive

Commodities and mineralogy

Main commodities	Cu
Ore minerals	malachite; pyrite

Geographic location

Quadrangle map, 1:250,000-scale	TN
Quadrangle map, 1:63,360-scale	B-1
Latitude	65.49177
Longitude	-150.11567
Nearby scientific data	Find additional scientific data near this location
Location and accuracy	This occurrence is at an elevation of about 600 feet on the west side of Minook Creek, and 380 feet above the Rampart road. The site is at Alaska Division of Geological and Geophysical Surveys (ADGGS) sample station 96SL220 (Liss and others, 1997), about at the middle of the west boundary of section 30, T. 8 N., R. 12 W., of the Fairbanks Meridian. The location is accurate within 500 feet.

Geologic setting

Geologic description Bedrock in the lower Minook Creek area consists of Lower Tertiary rhyolite and basalt that unconformably overlie Triassic to Mississippian Rampart Group argillite, chert, gabbro, and diverse sedimentary and low-grade metasedimentary rocks (Reifenstuhl and others, 1997 [PDF 97-15a]). No plutonic rocks are mapped in the area, which is cut by northeast- and north-trending high-angle faults. The bedrock at this occurrence is light-colored rhyolite that on the west side of Minook Creek is mostly covered by Quaternary unconsolidated deposits. A sample (96SL220) of [Rampart Group] copper stained, altered volcanic rock from the west side of the Rampart road about 0.5 mile below the junction of Hunter and Minook creeks contained 971 parts per million (ppm) copper and 6 ppm bismuth (Liss and others, 1997). A sample (96SL219) of Rampart Group pyritic volcanic(?) rock contained 128 ppm copper. There is no record of exploration or mining at this site.
Geologic map unit	(-150.118194092041, 65.4912993477797)

Geologic description

Bedrock in the lower Minook Creek area consists of Lower Tertiary rhyolite and basalt that unconformably overlie Triassic to Mississippian Rampart Group argillite, chert, gabbro, and diverse sedimentary and low-grade metasedimentary rocks (Reifenstuhl and others, 1997 [PDF 97-15a]). No plutonic rocks are mapped in the area, which is cut by northeast- and north-trending high-angle faults. The bedrock at this occurrence is light-colored rhyolite that on the west side of Minook Creek is mostly covered by Quaternary unconsolidated deposits.

A sample (96SL220) of [Rampart Group] copper stained, altered volcanic rock from the west side of the Rampart road about 0.5 mile below the junction of Hunter and Minook creeks contained 971 parts per million (ppm) copper and 6 ppm bismuth (Liss and others, 1997). A sample (96SL219) of Rampart Group pyritic volcanic(?) rock contained 128 ppm copper. There is no record of exploration or mining at this site.

Geologic map unit

(-150.118194092041, 65.4912993477797)

Production and reserves

Workings or exploration	A sample (96SL220) of [Rampart Group] copper stained, altered volcanic rock from the west side of the Rampart road about 0.5 mile below the junction of Hunter and Minook creeks contained 971 parts per million (ppm) copper and 6 ppm bismuth (Liss and others, 1997). A sample (96SL219) of Rampart Group pyritic volcanic(?) rock contained 128 ppm copper. There is no record of exploration or mining at this site.
Indication of production	None

Workings or exploration

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., 1997, Rock geochemistry from the Rampart mining district: Alaska Division of Geological & Geophysical Surveys Public Data File 97-29G, 19 p., 1 DVD. Reifenstuhl, R.R., Dover, J.H., Pinney, D.S., Newberry, R.J., Clautice, K.H., Liss, S.A., Blodgett, R.B., Bundtzen, T.K., and Weber, F.R., 1997, Geologic map of the Tanana B-1 Quadrangle, central Alaska: Alaska Division of Geological & Geophysical Surveys Report of Investigation 97-15A, 17 p., 1 sheet, scale 1:63,360.
Reporters	D.J. Szumigala (ADGGS)
Last report date	5/19/2004