Unnamed Occurrence (ARDF - CI078; near head of Hope Creek), Circle Mining District, Fairbanks North Star Borough, Alaska, USAi

Regional Level Types
Unnamed Occurrence (ARDF - CI078; near head of Hope Creek)	- not defined -
Circle Mining District	Mining District
Fairbanks North Star Borough	Borough
Alaska	State
USA	Country

Location: Occurrence is sample number 025, in Holm (1973). The sample is located on the north headwater fork of Hope Creek, NW1/4 SW1/4 sec. 22, T. 7 N., R. 6 E.
Geology: The occurrence is a 15-cm-wide fluorite vein in a fine-grained quartz- and opal-bearing breccia zone in a contact phase of biotite granite. Minor sulfide mineralization occurs in carbonate-bearing metamorphic rocks at the head of Hope Creek. Sulfides present are pyrrhotite, marcasite, and sphalerite with blebs of chalcopyrite, pyrite and arsenopyrite. None of these minerals occurs in quantities of economic significance. Samples of granite taken near the head of Hope Creek contained trace to small amounts of allanite (?), fluorite, galena, malachite, molybdenite, pyrite, pyrrhotite, rutile, scheelite and stibnite (Holm, 1973). Biotite from this granite has been dated at 59.5 +/- 1.8 m.a. by the K/Ar method (Holm, 1973).
Workings: Surface samples taken.
Age: The principal occurrence is a fluorite vein in a fine-grained quartz- and opal-bearing breccia zone in a contact phase of biotite granite. The biotite in the granite has been dated at 59.5 +/- 1.8 m.a. by the K/Ar method (Holm, 1973).

Commodities (Major) - F; (Minor) - Cu, Mo, Pb, REE (?), Sb, W, Zn
Development Status: None

Other Databases

Link to USGS - Alaska:	CI078

Other Regions, Features and Areas containing this locality

References