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Rattlesnake Hills Gold property

Prospect in Natrona county in Wyoming, United States with commodity Gold
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Public Land Survey System information
  6. Commodities
  7. Mineral occurrence model information
  8. Nearby scientific data
  9. Economic information about the deposit and operations
  10. Mining district
  11. Ownership information
  12. Reserves and resources
  13. Bibliographic references
  14. General comments
  15. Reporter information

Geologic information

Identification information

Deposit ID 10400396
Record type Deposit
Mineralized Area Rattlesnake Hills gold area
Current site name Rattlesnake Hills Gold property
Alternate or previous names Lost Muffler

Geographic coordinates

Point of reference Ore Body
Geographic coordinates: -107.31345, 42.73745 (WGS84)
Location accuracy 1000(meters)
Relative position GPS at one of several outcrops above the buried ore bodies. Approximately 48 miles west of Casper at UTM 328400 ? 4712440 (NAD27 CONUS), access is made by turning north from WY State Highway 220 onto the Rattlesnake Hills Road. A drive of approximately 16 miles reaches the turnoff into the\nproperty in Section 36, T32N, R88W.

Site location context

Political divisions (FIPS codes)

Natrona(county)

Wyoming(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Barlow Gap(quadrangle 1:24,000 scale)

Rattlesnake Hills(quadrangle 1:100,000 scale)

Casper(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Sweetwater(hydrologic unit)

North Platte(hydrologic accounting unit)

North Platte(hydrologic subregion)

Missouri(hydrologic region)

Federal lands

Bureau of Land Management(Bureau of Land Management WY)

Bureau of Land Management WY BLM(Type of land area)

BLM(Federal land areas administered by BLM)

Geographic areas

Country State County
United States Wyoming Natrona

Public Land Survey System information

Meridian Township Range Section Fraction State
6th Principal 032N 088W 24 E2 Wyoming

Comments on the location information

  • Deposit covers several square miles. Mostly in sec. 24 and adjacent sections.
  • 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)

Commodities

Commodity Importance
Gold Primary

Mineral occurrence model information

Model code 84
USGS model code 22b
Deposit model name Alkaline Au-Te (Au-Ag-Te veins)
Mark3 model number 80

Nearby scientific data

Ore Body (1) -107.31345, 42.73745
ListMap

Economic information

Comments on the geologic information

  • "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)

Economic information about the deposit and operations

Development status Prospect
Significant Yes
Discovery year 1982
Discoverer W. Dan Hausel
Production years Still (2010) in exploration phase, not yet in production.

Mining district

District name Rattlesnake Hills

Ownership information

  • Type Joint Venture Owner-Op
    Owner Evolving Gold
    Interest 100
    Home office 1980?1075 West Georgia Street\nVancouver, BC V6E 3C9 \nwww.evolvinggold.com\nT. 604.685.6375\nF. 604.909.1163\nToll free 866.604.3864\ninfo@evolvinggold.com\n\n \n \n
    Year 2010
  • Type Unknown
    Owner Crescent Resources
    Last year 2010

Comments on the ownership information

  • 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)
  • 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]

Reserves and resources

  • Type In-situ
    Estimate year 2010
    Remarks There is not yet sufficient information to project a mineral resource at the Rattlesnake project.

Comments on the workings information

  • 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).

Comments on 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)

Reference information

Bibliographic references

  • Deposit

    Site visit. Sept. 2009
    Hausel, 1996b
    www.evolvinggold.com

  • 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)

Comments on the references

  • 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)

General comments

Subject category Comment text
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)
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).

Reporter information

Type Date Name Affiliation Comment
Reporter 06-JUN-10 Wilson, Anna B. U.S. Geological Survey

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

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