Rattlesnake Hills Gold property

Site Name

Primary: Rattlesnake Hills Gold property
Secondary: Lost Muffler
Secondary: North Stock
Secondary: Antelope Basin
Secondary: South Stock

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Commodity

Primary: Gold

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Location

State: Wyoming
County: Natrona
District: Rattlesnake Hills

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Land Status

Not available

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Holdings

Not available

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Workings

Not available

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Ownership

Owner Name: Crescent Resources

Owner Name: Evolving Gold
Percent: 100.0
Home Office: 1980?1075 West Georgia Street Vancouver, BC V6E 3C9 www.evolvinggold.com T. 604.685.6375 F. 604.909.1163 Toll free 866.604.3864 [email protected]
Info Year: 2010

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Production

Not available

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Deposit

Record Type: Deposit
Operation Category: Prospect
Deposit Type: Alkaline intrusion-related Au
Operation Type: Unknown
Discovery Year: 1982
Discovery Method: Geochemical Anomaly
Years of Production:
Organization:
Significant: Y

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Physiography

Not available

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Mineral Deposit Model

Model Name: Alkaline Au-Te (Au-Ag-Te veins)

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Orebody

Not available

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Structure

Not available

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Alterations

Not available

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Rocks

Not available

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Analytical Data

Not available

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Materials

Not available

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Comments

Comment (Deposit): The following two types of Au mineralization occur on the Rattlesnake claims: Type 1: Gold hosted by Fe-rich chert horizons in the Archean basement, which is currently considered to have a low economic potential, and Type 2: Disseminated, micron-size Au mineralization related to, and largely hosted by the Eocene-age Rattlesnake Hills Alkalic Complex, particularly the diatreme breccias. This type has a very high economic potential and will be the focus of exploration efforts by Evolving Gold Corp. (NI 43-101, p. 3 or p. 7 of 44)

Comment (Development): Undocumented early work includes 20 to 30 shallow prospect pits and two 10 to 20 footlong shafts that are remnants of prospecting activities in the early 1900?s. In the early 1980?s, America Copper and Nickel Company (ACNC) conducted exploration on the property. Geologic mapping, surface geochemistry and geophysical surveys were completed in 1983 and 1984, although very little data from these surveys is apparently available. In 1985 to 1987 they completed 32 reverse circulation drill holes totaling 9,815 feet. Of this, 22 holes tested the Archean chert-hosted Au mineralization. The remaining 10 holes (totaling 3,917 feet) targeted the Eocene-hosted mineralization. Between 1993 and 1995, Newmont Exploration Ltd. (NEL) identified the Eocene ?North Stock? and ?Eureka Peak? areas as targets. In 1994 and 1995 they drilled both targets but no Au mineralization was intersected at Eureka Peaks. In the North Stock area, 10,705 feet of core and reverse circulation drilling was done in 14 holes. Since the work by NEL in the late 1990?s, the Author believes that no significant exploration has taken place on the Rattlesnake property. MacLeod (2003) has completed a compilation report on this work. (NI 43-101, p. 4 or p. 8 of 44)

Comment (Location): The Rattlesnake property lies in Natrona County, Wyoming (Figures 1 & 2) in Sections 13, 14, 15, 23, 24, 25, 26 and 36, T32N, R88W, and Sections 18, 19, 30 and 31, T32N and R87W. (NI 43-101, p. 1 or p. 5 of 44)

Comment (Ownership): Under the terms of an Option Agreement dated January 16th 2008 between Golden Predator Mines (US) Inc. (?Golden Predator?), of 15900 Caswell Lane, Reno, Nevada 89511, U.S.A. and Evolving Gold Corporation (?Evolving Gold?) of 725-666 Burrard Street, Vancouver, Canada, V6C 2X8, the Rattlesnake property in central Wyoming (Figure 1) has been purchased by Evolving Gold. (NI 43-101, p. 1 or p. 5 of 44)

Comment (Workings): The property consists of 30 unpatented lode mining claims that were staked between 1985 and 1987, 97 unpatented lode mining claims that were staked in 2006, and approximately 276 hectares of Wyoming State lease lands (Figure 2). The property covers an area approximately 6 km long N-S and 1.6 - 3 km wide E-W. (NI 43-101, p. 1 or p. 5 of 44).

Comment (Geology): "Precambrian-Archean basement rocks, with some Eocene intrusive and lesser extrusive units of the Rattlesnake Hills Alkaline Complex (43-44 Ma; million year old), are the dominant rock units on the property. The latter, which will be the main focus of future Au exploration, comprise >15 Eocene plugs, domes and small stocks, including some subcircular to oval shaped intrusions that exceed 500 meters in diameter. The most economically important of these known to date are often surrounded by, or spatially adjacent to, diatreme breccias. In the central part of the property is the ?South Stock? (Figure 1), a 400 by 700 meter wide plug of nepheline trachyte, and the nearby ?Antelope Basin? (Figure 2) where drilling has also outlined Au mineralization. Further north is the ?Northeast Stock? (Figures 2 and 3), a 700 to 800 meter diameter central phonolite plug with its surrounding breccia apron, and the ?North Stock? where drilling has outlined significant Au mineralization in its southern peripheral breccia halo. Both monolithic and heterolithic Eocene breccias are present, with the latter containing angular to sub-rounded fragments of Precambrian schists and the contemporary Eocene alkalic intrusives. The high-level intrusive activity was accompanied by the formation of explosive diatreme pipes and the local eruption of tuffs and surge deposits, which locally blanket parts of the Archean basement." (Ray, G.E., Feb 15, 2008, NI 43-101, p. 3 (or) p. 7 of 44)

Comment (Reference): Ray, G.E., 2008, The geology and gold mineralization at the Rattlesnake Hills property, Natron County, Wyoming, USA (UTM Zone 13 T0310650-4732850) NAD27 CONUS, A national intruments 43-101 Technical Report for Evolving Gold Corp, 666 Burrard St, Suite 725, Vancouver, BC, CANADA V6C 2X8: available online from sedar.com, 44 p. (Technical report, ammended Feb 18, 2008)

Comment (Location): Deposit covers several square miles. Mostly in sec. 24 and adjacent sections.

Comment (Ownership): News release dated Mon. June 21, 2010, on Crescent Resouces website (crescentresourcescorp.com) says that the property was relinquished to Cowboy. [http://www.crescentresourcescorp.com/s/NewsReleases.asp?ReportID=413392&_Type=News-Releases&_Title=Crescent-Resources-Returns-Rattlesnake-Hills-Project]

Comment (General): "The dominant trend of the steeply northerly dipping metamorphic foliation and structures in the Archean basement is NW-SE to WNW-ESE. This basement trend is transected by younger NE-SW to northerly-striking, steeply-dipping faults that apparently controlled the distribution and orientation of some Eocene alkaline plugs and dikes. Thus, areas where these two sets of major structures intersect are regarded as favorable places for exploration. Also present are several sub-circular, moderately inclined fractures that appear to circle some of the alkalic plugs and diatreme breccia pipes. These may represent either ring fractures related to the intrusion of the stocks or be related to post-eruption slumping. These curvilinear features are economically important as they have controlled some of the potassic feldspar alteration and Au mineralization." (NI-43-101, p. 7 of 44).

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References

Reference (Deposit): Ray, G.E., 2008, The geology and gold mineralization at the Rattlesnake Hills property, Natron County, Wyoming, USA (UTM Zone 13 T0310650-4732850) NAD27 CONUS, A national intruments 43-101 Technical Report for Evolving Gold Corp, 666 Burrard St, Suite 725, Vancouver, BC, CANADA V6C 2X8: available online from sedar.com, 44 p. (Technical report, ammended Feb 18, 2008)

Reference (Deposit): Site visit. Sept. 2009 Hausel, 1996b www.evolvinggold.com

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