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Happy Prospect, Fortymile District, Southeast Fairbanks Borough, Alaska, USA

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The Happy prospect is located within Doyon, Ltd. selected or conveyed land. For more information contact Doyon, Ltd., Fairbanks, Alaska.
Location: The Happy prospect is at an elevation of about 3,600 feet and centered about 2 miles southeast of VABM Happy. The prospect includes the ridges on both sides of the valley of an unnamed stream that is a tributary of North Fork of the Fortymile River. The coordinates are the approximate center of the prospect,in section 27, T. 4 S., R. 27 E., of the Fairbanks Meridian; the location is accurate within 1,000 feet. This prospect is located within Doyon, Ltd. selected or conveyed land.
Geology: Scheelite and molybdenite are found in quartz veins,and molybdenite occurs in rubble of quartz-porphyry stockworks (Dashevsky and others, 1986). A multi-phase granitic pluton composed of granite, quartz monzonite, and lesser diorite, alaskite, quartz porphyry, and quartz lamprophyre is inferred to underlie the heavily vegetated region. On the ridges surrounding the valley, Paleozoic hornfelsed metasedimentary rocks crop out; there is local development of garnet-pyroxene-biotite-tremolite skarn. Remnant felsic volcanic rocks cap some ridges. Weak argillic alteration of feldspars is common in the intrusive rocks with no sulfides (U.S. Bureau of Mines, 1995). Six skarn bodies have been mapped at the Happy prospect; they consist of dark-green pyroxene-calc-silicate rocks with local wollastonite and marble (Robinson, 1979). The skarns locally contain small pods of pyrrhotite-rich skarn as much as 8 feet in diameter that assay as much as 624 ppm copper, 1,900 ppm lead, 6.4 percent zinc, and 8.6 ppm silver. Float boulders of quartz veins contain molybdenite and wolframite, with as much as 0.3 percent molybdenum and 0.82 percent tungsten. A soil survey in the heavily vegetated basin identified a molybdenum, soil anomaly 1,000 by 1,500 feet in size (Robinson, 1979). Samples of mineralized rocks collected by the U.S. Bureau of Mines (1995) include skarn that contains 1,680 ppb gold, 130 ppm silver, and 1.67 percent copper, as well as a massive pyrrhotite boulder that contains 3.0 percent zinc and 1,650 ppm cadmium. Muscovite from a tungsten-bearing greisen vein in granite at the Happy prospect gives a 40Ar/39Ar plateau age of 214 +/- 0.6 Ma (Newberry and others, 1996). Exploration of the Happy prospect by WGM Inc. from 1975 to 1978 included sampling of stream sediments and panning heavy-mineral concentrates, rock and soil sampling, and geologic mapping (Dashevsky and others, 1986). In 1979, the Union Carbide Corp. conducted mapping and rock samping at the prospect and extended the soil grid. Samples of mineralized rocks were collected by the U.S. Bureau of Mines at the prospect in the early 1990's (U.S. Bureau of Mines, 1995).
Workings: Exploration of the Happy prospect by WGM Inc. from 1975 to 1978 included sampling of stream sediments and panning heavy-mineral concentrates, rock and soil sampling, and geologic mapping (Dashevsky and others, 1986). In 1979, the Union Carbide Corp. conducted mapping and rock samping at the prospect and extended the soil grid. Samples of mineralized rocks were collected by the U.S. Bureau of Mines at the prospect in the early 1990's (U.S. Bureau of Mines, 1995).
Age: Muscovite from a tungsten-bearing greisen vein in granite collected at the Happy prospect gives a 40Ar/39Ar plateau age of 214 +/- 0.6 Ma (Newberry and others, 1996).
Alteration: Weak argillic alteration of feldspars is common in intrusive rocks at the Happy prospect (U.S. Bureau of Mines, 1995).

Commodities (Major) - Mo, W, Zn; (Minor) - Au, Ag, Cd, Cu, Pb, Zn
Development Status: None
Deposit Model: W skarn or porphyry Mo (Cox and Singer, 1986; models 14a and 21b).

Mineral List



10 entries listed. 6 valid minerals.

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References

Burleigh, R.E., and Lear, K.G., 1994, Compilation of data for Phase I of the mineral resource evaluation of the Bureau of Land Management Black River and Fortymile subunits: U.S. Bureau of Mines Open-File Report 48-94, 116 p. Carter, C.H., 1981, Doyon exploration program, Blocks 4, 5, 8, and 22: Doyon, Ltd. Report 81-27. (Report held by Doyon, Ltd., Fairbanks, Alaska). Dashevsky, S.S., Nicol, D.L., and Bond, J., 1986, Mines, prospects, and geochemical anomalies on Doyon Limited regional overselection lands, Alaska, Blocks 1-8: Doyon, Ltd. Report 86-01a, 300 p. (Report held by Doyon, Ltd., Fairbanks, Alaska). Lessman, J., and Rishel, J., 1978, 1977 annual progress report, Doyon Project, Volume 12, Middle Fork tungsten anomalies: Doyon, Ltd. Report 78-10. (Report held by Doyon, Ltd., Fairbanks, Alaska). Newberry, R.J., Layer, P.W., Burleigh, R.E., and Solie, D.N., 1996, New 40Ar/39Ar dates for intrusions and mineral prospects in the eastern Yukon-Tanana terrane, Alaska - Regional patterns and significance, in Gray, J.E., and Riehle, J.R., eds., Geological Studies in Alaska by the U.S. Geological Survey, 1996: U.S. Geological Survey Professional Paper 1595, p. 131-159. Robinson, R.F., 1979, Happy Mountain project area report: Doyon, Ltd. Report, 7 p. (Report held by Doyon, Ltd., Fairbanks, Alaska). U.S. Bureau of Mines, 1995, Final report of the mineral resource evaluation of the Bureau of Land Management Black River and Fortymile River Subunits: U.S. Bureau of Mines Open-File Report 79-95, 226 p. WGM Inc., 1977, Doyon Project, 1976 annual progress report, volume 1a, Blocks 1, 4, 5, 7, 8: Doyon, Ltd. Report 77-02a. (Report held by Doyon, Ltd., Fairbanks, Alaska). Yinger, M., Randolph, D., and Ruzicka, J., 1979, Doyon Project, 1978 annual progress report, Happy Mountain prospect report: Doyon, Ltd. Report 78-35. (Report held by Doyon, Ltd., Fairbanks, Alaska).

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