Emigrant Deposit

Prospect in Elko county in Nevada, United States with commodities Gold, Arsenic, Antimony, Barium-Barite

Geologic information

Identification information

Deposit ID 10310411
MRDS ID RE00037
Record type Site
Current site name Emigrant Deposit
Alternate or previous names Emigrant Springs Deposit

Comments on the site identification

  • This record supersedes MRDS record RE00037, which should be deleted, as this record contains all information in RE00037 plus additional updates.

Geographic coordinates

Geographic coordinates: -115.97341, 40.61741 (WGS84)
Elevation 1890
Relative position The deposit is located about ten miles south of Carlin, NV.
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Geographic areas

Country State County
United States Nevada Elko

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 31N 053E 01 02 03 11 12 Nevada
Mount Diablo 32N 053E 24 26 34 36 Nevada

Comments on the location information

  • The Emigrant deposit is located 2.5 miles east of the Rain mine and 10 miles southeast of the town of Carlin. The proposed Emigrant Mine and associated facilities will cover approximately 1172 acres of public land and 260 acres of private land.

Commodities

Commodity Importance
Gold Primary
Arsenic Tertiary
Antimony Tertiary
Barium-Barite Tertiary

Comments on the commodity information

  • Ore Materials: gold
  • Gangue Materials: barite, alunite, jarosite, kaolinite, limonite

Materials information

Materials Type of material
Gold Ore
Barite Gangue
Alunite Gangue
Jarosite Gangue
Kaolinite Gangue
Limonite Gangue

Alteration

  • (Local) The north-trending Emigrant fault zone hosts the Emigrant Springs deposit in mudstone of the Webb Formation along the contact of the Devils Gate Limestone. The Emigrant Springs fault is highly silicified with minor barite, alunite, jarosite, and kaolinite. The bedding parallel jasperoid which constitutes the ore zone is typically massive, waxy, tan to maroon, and fine-grained. Liesegang banding of unsilicified Webb Formation rocks above the jasperoid is common.

Mineral occurrence model information

Model code 173
USGS model code 26a.1
Deposit model name Sediment-hosted Au
Mark3 model number 17

Host and associated rocks

  • Host or associated Host
    Rock type Sedimentary Rock > Carbonate > Limestone
    Rock type qualifier interbedded
    Rock unit name Devils Gate Limestone
    Stratigraphic age (youngest) Late Devonian
    Stratigraphic age (oldest) Middle Devonian
  • Host or associated Host
    Rock type Sedimentary Rock > Clastic Sedimentary Rock > Mudstone
    Rock unit name Webb Formation
    Stratigraphic age (youngest) Early Mississippian
  • Host or associated Host
    Rock type Sedimentary Rock > Clastic Sedimentary Rock > Sandstone
    Rock unit name Chainman Formation
    Stratigraphic age (youngest) Late Mississippian
    Stratigraphic age (oldest) Early Mississippian
  • Host or associated Host
    Rock type Metamorphic Rock > Metasedimentary Rock > Quartzite
    Rock unit name Chainman Formation
    Stratigraphic age (youngest) Late Mississippian
    Stratigraphic age (oldest) Early Mississippian
  • Host or associated Associated
    Rock type Plutonic Rock > Granitoid > Monzonite
    Rock type qualifier altered dike
    Chronological age 37.5
    Uncertainty 0.8
    Stratigraphic age (youngest) Middle Eocene

Nearby scientific data

(1) -115.97341, 40.61741

Geologic structures

Type Description Terms
Local The Emigrant Springs fault is filled with jasperoidal breccia over a 50-foot width for 2200 feet along strike. The sense of movement on the fault is reverse.
Regional The property lies just beyond the easternmost limit of the Roberts Mountains Thrust. Emigrant Springs occurs on the NW limb of the Pinon Range anticline.

Ore body information

  • General form stratiform
    Strike N-S
    Dip GENTLY WEST
    Thickness 73.15M
    Depth to top 0M

Controls for ore emplacement

  • The Emigrant Springs fault, a north-striking reverse fault is the conduit for gold-bearing hydrothermal fluids. Au occurs disseminated in jasperoid that has developed at and above the contact between massive limestones of the Devils Gate Formation and siliciclastic rocks of the overlying Webb Formation. This mineralized jasperoid forms a bedding parallel dip slope now exposed at surface, resulting in strip ratios of essentially 0:1. Proximity to the hinge of the Pinon Range anticline may have influenced localization of gold.

Economic information

Economic information about the deposit and operations

Operation type Surface
Development status Prospect
Commodity type Both metallic and non-metallic
Deposit size Small
Significant Yes
Discovery year 1981

Mining district

District name Rain Subdistrict
District name Carlin Trend District SE
District name Railroad District
District name Bullion District

Land status

Ownership category Private
Ownership category BLM Administrative Area
Area name Elko BLM Administrative District

Ownership information

  • Type Owner-Operator
    Owner Newmont Mining Corp.
    Year 2006

Reserves and resources

  • Type In-situ
    Estimate year 1989
    Commodity Subtype Grade units Group Importance Year
    Gold Au 0.451 g/mt Gold Major 1989

Comments on the workings information

  • surface exploration, drilling

Comments on other economic factors

  • In 1989, reserves were reported as 30.3 Mt of ore grading 0.021 opt Au. In 1993, the Emigrant deposit was estimated to contain a remaining resource of 60,000 kilotonnes of ore containing 35 tonnes of gold and an unknown amount of silver. Emigrant increased its reserves from 344,000 ounces to 1.2 million ounces at year-end 2002, plus additional mineralized material not in reserves: 3 million tons grading 0.016 ounces of gold per ton.

Comments on development

  • For the portion of the deposit in section 26: Homestake Mining was the first to conduct exploration on the property. Activities in 1981 consisted of grid soil and rock chip sample surveys, and two outcropping gold-bearing jasperoid zones were tested with rotary drilling. Homestake terminated their lease and the property then passed to Tarpon Oil Company who drilled an additional 22 holes in 1983 and 1984. Western States Minerals Company optioned the property in 1985 and drilled 20 holes in an effort to expand the known mineralization. Teck Resources acquired the property in 1987 and conducted detailed geologic mapping, soil sampling, and IP geophysical surveys. 41 holes were drilled between 1987 and 1989, both to fill in the known mineralization and to test new targets. A total of 136 holes had been drilled by 1989. For the portion of the deposit in section 35: this portion of the deposit was discovered by Newmont in the early 1980s during exploration peripheral to the Rain deposit 1.5 miles to the west. In 2002, Newmont Mining Corp. continued to evaluate the Emigrant project on the Carlin trend, where they feel there is potential for expanding the old Emigrant Mine. The U.S. Bureau of Land Management has been working on an environmental assessment of a proposed project there for several years, and Emigrant is scheduled to be in production in 2008, with a 7 year mine life. In spring 2004 BLM publicized a notice that Newmont Mining Corporation has submitted a Plan of Operations to open the Emigrant Mine which would include developing and operating an open pit mine; constructing a waste rock disposal facility, storing oxide waste in mined areas of the pit; developing an oxide heap leach pad; and constructing ancillary facilities and concurrent reclamation. Proposed mining operations would last for approximately 9 years through the year 2013. In 2005, a reverse-circulation drilling program of more than 60 holes was aimed at delineating potential mineralization to the east of the defined Emigrant deposit.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS RE00037 MRDS dep_id 10055095 merged into this record.

Bibliographic references

  • Deposit

    NBMG MI-88 thru MI-02

  • Deposit

    NBMG Bull. 106

  • Deposit

    Elko Land Status Map 1978

  • Deposit

    Amer. Mines (1996), 1995

  • Deposit

    Thompson, 1999

  • Deposit

    Newmont Ann. Rept. 1988

  • Deposit

    Jackson, P., 1992, Geology and mineralization of the Emigrant Springs Project, Elko County, Nevada, in Buffa, R. and Coyner, A., eds., The Geology and Ore Deposits of the Great Basin-Field Trip Guidebook Compendium, The Geological Society of Nevada, Reno, p. 125-130.

  • Deposit

    Thoreson, R., 1991, Geology and gold deposits of the Rain subdistrict, Elko County, Nevada, in Raines, G.L., et al., eds., Geology and Ore Deposits of the Great Basin, The Geological Society of Nevada, Reno, p. 635-643.

  • Deposit

    Thoreson, R., 1990, Geology and Ore Deposits of the Rain Subdistrict, Elko County, Nevada, Oral Presentation at Great Basin Symposium, The Geological Society of Nevada, Reno/Sparks, April 4.

  • Deposit

    Nevada Dept.of Minerals, 1994

  • Deposit

    Newmont Gold 1993 Sec Form 10k;

  • Deposit

    Jackson, 1991

  • Deposit

    Long, K.R., DeYoung, J.H., Jr., and Ludington, S.D., 1998, Significant deposits of gold, silver, copper, lead, and zinc in the United States: U.S. Geological Survey Open-File Report 90-206A, 33 p.; 98-206B. one 3.5 inch diskette.

  • Deposit

    Adella Harding, Elko Daily Free Press, 10/4/02.

  • Deposit

    Newmont 5-Year Business Plan Update (September 24, 2003) ? Supplemental Information.

  • Deposit

    Anthony A. Longo, Tommy B. Thompson, and J. Bruce Harlan, 2002, Geologic Overview of the Rain Subdistrict, in NBMG Bull 111.

General comments

Subject category Comment text
Deposit Emigrant is an oxide gold deposit exposed at the surface with a low strip ratio. Newmont?s current feasibility study assumes simple processing by run-of-mine heap leaching. The north-trending Emigrant fault zone hosts the Emigrant Springs deposit in mudstone of the Webb Formation along the contact of the Devils Gate Limestone.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-APR-1992 Phinisey, J. D. (Marcus, S.) U.S. Geological Survey
Updater 01-SEP-1994 Li, Zhiping (Moyer, Lorre A.) U.S. Geological Survey
Reporter 01-JUN-2003 LaPointe, D.D. Nevada Bureau of Mines and Geology
Editor 01-SEP-2007 Schruben, Paul G. U.S. Geological Survey Converted from S&A FileMaker format to Oracle. Edit checks on rocks, units, and ages with Geolex search, and other fields.