Revelation

Prospect, Active

Commodities and mineralogy

Main commodities Ag; Au; Cu
Ore minerals pyrite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale LH
Quadrangle map, 1:63,360-scale D-3
Latitude 61.7783
Longitude -153.0635
Nearby scientific data Find additional scientific data near this location
Location and accuracy The location of the Revelation prospect is ambiguous. Most recently (2011), it is reported to be about 10.6 miles south-southeast of the junction of the South Fork of the Kuskokowim River and the Styx River near the center of section 34, T. 20 N., R. 21 W. The prospect may be a mile or more from this location and an earlier report places it about 2 miles to the north-northwest.

Geologic setting

Geologic description

Relatively little is known about the Revelation prospect. It probably is similar to other deposits in the area (TY031, TY032, TY 019) that are associated with the Cretaceous (65-66 Ma), Mount Estelle and similar plutons in the area. The Mount Estelle pluton is zoned with a granite core and marginal phases of quartz monzonite, quartz monzodiorite, augite monzodiorite, diorite, and lamprophyric mafic and ultramafic rocks (Reed and Elliott, 1970; Millholland, 1995; Crowe and others, 1991; Crowe and Millholland, 1990). The pluton intrudes Jurassic and Cretaceous sedimentary rocks that are hornfelsed adjacent to the pluton, are locally stained red, and have been altered to sericite and clay. Pyrite is disseminated along fractures.
There was considerable work in the Mount Estelle area by government and industry as far back as the 1970s that identified mineralization but most of the work was more reconnaissance than prospect specific (see TY019). From 2005 to 2008, several companies, Hidefield Gold Plc. (2008), International Tower Hill Mines Ltd. (2007) and Millrock Resources Inc. (2008), worked in the area and defined several specific prospects. As described in Hidefield (2008), the Revelation vein can be traced for 200 meters on the surface. Two samples contained 32.4 and 7.07 grams of gold per ton, 8.1 and 12.6 grams of silver per ton, and 0.10 and 0.15 percent copper.
Millrock is currently (March, 2012) exploring the area as part of their Estelle project, which covers a large block of claims north and south of Mount Estelle; the Revelation vein is in that block. Millrock describes the deposit as quartz stockwork veining that extends for 600 meters in an iron-stained zone of porphyritic diorite and hornfelsed sedimentary rocks. Their geochemical sampling suggests the area of mineralization is larger.
Geologic map unit (-153.065719104803, 61.7776922976806)
Mineral deposit model Gold-copper porphyry deposit? Intrusion-related gold deposit?
Age of mineralization Probably related to a nearby 65-66 Ma pluton.
Alteration of deposit Iron staining and sericitic and clay alteration in hornfelsed rocks.

Production and reserves

Workings or exploration There was considerable work in the Mount Estelle area by government and industry as far back as the 1970s that identified mineralization but most of the work was more reconnaissance than prospect specific (see TY019). From 2005 to 2008, several companies, Hidefield Gold Plc. (2008), International Tower Hill Mines Ltd. (2007) and Millrock Resources Inc. (2008), worked in the area and defined several specific prospects, including the Revelation prospect. Millrock is currently (March, 2012) exploring the area as part of their Estelle project which covers a large block of claims north and south of Mount Estelle; the Revelation prospect is in that block. Their only work in 2011 at the Revelation prospect was surface sampling.
Indication of production None
Reserve estimates None.
Production notes None.

References

References

Crowe, D.E., and Millholland, M.A., 1990, High-grade gold mineralization associated with high salinity hydrothermal fluids, Mt. Estelle pluton, central Alaska Range [abs.]: Geological Society of America, Abstracts with Programs, v. 22, p. A41.
Hidefield Gold Plc., 2008, South Estelle: http://www.hidefieldgold.com/s/SouthEstelle.asp (as of May 25, 2008)
International Tower Hill Mines Ltd., 2007, ITH further defines mineralization at South Estelle: http://www.ithmines.com/s/NewsReleases.asp?ReportID=267305&_Type=News-Releases&_Title=ITH-Further-Defines-Mineralization-at-South-Estelle (News Release, October 18, 2007)
Millholland, M.A., 1995, Geology and discovery at Mount Estelle: Newsletter of the Alaska Geological Society, v. 24, no. 8, p. 1.
Millrock Resources Inc., 2008, Estelle: http://www.millrockresources.com/index.php/projects/estelle/ (as of May 25, 2008).
Millrock Resources Inc., 2012, Revelation: http://www.millrockresources.com/projects/revelation/ (as of March 4, 2012).
Reporters D.J. Grybeck (Contractor, USGS)
Last report date 4/1/2012