Mike Occurrence, Koyukuk Mining District, Yukon-Koyukuk Census Area, Alaska, USAi

Regional Level Types
Mike Occurrence	Occurrence
Koyukuk Mining District	Mining District
Yukon-Koyukuk Census Area	Census Area
Alaska	State
USA	Country

See also: Vicki (CH097), Pilgrim (CH099), Evelyn Lee (CH059), Luna (CH101), Victor (CH064), and Ginger (CH060). In early reports (DeYoung, 1978, Newberry and others, 1986) the Mike prospect is grouped with all or some of the Pilgrim, Cindy, and Vicki prospects.
Location: The Mike occurrence is at an elevation of about 4,000 feet just east of the headwaters of Robert Creek (SE1/4 sec. 14, T. 34 N., R. 7 W., of the Fairbanks Meridian) approximately 7 miles north-northeast of Horace Mountain and about 1 1/2 miles west of the Cindy prospect (CH098). The location is accurate within a 1/2-mile radius.
Geology: The Mike occurrence is one of four previously grouped occurrences which, in addition to Mike, included Vicki (CH097), Cindy (CH098), and Pilgrim (CH099) (DeYoung, 1978). Newberry and others (1986) described in general a group of skarn prospects in the Chandalar area which includes the Mike occurrence. This group of skarns is northwest of a belt of Devonian(?) granitic rocks informally named the Horace Mountain plutons. Many of the skarns exhibit both prograde and retrograde mineral assemblages. Newberry and others (1986) stated that the mineralogy, mineralization, and alteration of these skarns categorize them as continental-margin, porphyry-related copper skarns. Early data on this group of prospects indicated the presence of small amounts of tactite-associated copper mineralization (DeYoung, 1978). Newberry and others (1986) classified the Mike prospect as a Cu (Zn-Ag?) skarn, and Newberry and others (1997) classified it as a calcic Cu skarn. The mineralogy of a specimen (identified only as being from the Mike-Vicki-Cindy prospects) includes epidote, chalcopyrite, pyrite, and sphalerite (Newberry and others, 1986). An analysis of this specimen ran 0.25 percent Cu, 0.83 percent Zn, 0.002 percent Pb, and 0.5 ppm Ag. A listing for the Mike prospect on the Ventures Resource Corporation (currently exploring Doyon, Limited lands in the Chandalar area) website (1998, URL http://www.venturesresource.com/) classifies it as a Cu-Au deposit, although no supporting data are given.
Workings: Claims located in 1972.
Age: Devonian(?) based on reported Early Devonian Pb/Pb zircon ages from the associated Baby Creek batholith and Horace Mountain plutons (Dillon and others, 1996).
Alteration: Calc-silicate(?).

Commodities (Major) - Ag, Au(?), Cu; (Minor) - Pb, Zn
Development Status: None
Deposit Model: Cu skarn deposits (Cox and Singer, 1986; model 18b)

Other Databases

Link to USGS - Alaska:	CH100

Other Regions, Features and Areas containing this locality

References