Happy

Prospect, Inactive

Commodities and mineralogy

Main commodities Mo; W; Zn
Other commodities Au; Ag; Cd; Cu; Pb; Zn
Ore minerals molybdenite; pyrrhotite; scheelite; wolframite
Gangue minerals biotite; calc-silicates; garnet; pyroxene; quartz; tremolite; wollastonite

Geographic location

Quadrangle map, 1:250,000-scale EA
Quadrangle map, 1:63,360-scale C-3
Latitude 64.5351
Longitude -142.3113
Nearby scientific data Find additional scientific data near this location
Location and accuracy 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.

Geologic setting

Geologic description

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 sampling 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 1990s (U.S. Bureau of Mines, 1995).
Geologic map unit (-142.313615869772, 64.5347606193633)
Mineral deposit model W skarn or porphyry Mo (Cox and Singer, 1986; models 14a and 21b).
Mineral deposit model number 14a or 21b
Age of mineralization 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 of deposit Weak argillic alteration of feldspars is common in intrusive rocks at the Happy prospect (U.S. Bureau of Mines, 1995).

Production and reserves

Workings or exploration 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 sampling 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 1990s (U.S. Bureau of Mines, 1995).
Indication of production None

Additional comments

The Happy prospect is located within Doyon, Ltd. selected or conveyed land. For more information contact Doyon, Ltd., Fairbanks, Alaska.

References

References

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).
Robinson, R.F., 1979, Happy Mountain project area report: Doyon, Ltd. Report, 7 p. (Report held by Doyon, Ltd., Fairbanks, Alaska).
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).
Reporters R.L. Flynn; M.B. Werdon
Last report date 5/1/2002