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Dee Mine (Boulder Creek Mine), Bootstrap Mining District, Elko Co., Nevada, USAi
Regional Level Types
Dee Mine (Boulder Creek Mine)Mine
Bootstrap Mining DistrictMining District
Elko Co.County
NevadaState
USACountry

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Key
Latitude & Longitude (WGS84):
41° 2' 9'' North , 116° 25' 37'' West
Latitude & Longitude (decimal):
Locality type:
Nearest Settlements:
PlacePopulationDistance
Carlin2,302 (2017)44.9km


From 1984-1995, the combined Dee-Ren deposits produced 16 tonnes of gold and >9.4 tonnes of silver from >10,143 kilotonnes of ore. In 1995, the combined Dee-Ren deposits were estimated to contain a remaining resource of 11,024 kilotonnes of ore containing 18.25 tonnes of gold (Long and others, 1998). Ore was shipped from the Ren deposit, 2-1/2 miles to the southeast, for processing at Dee in the mid-1990s, so production data from that time period includes Ren production. Cash costs of gold production were <$200/oz. in 1987, $204/oz. in 1988, $247/oz. in 1989, and $264/oz. in 1990. Mining costs were $6 per ton milled in 1987. Proven and probable reserves reported by Glamis Gold in 1998 for the Dee Mines were 1.778 million tons of ore grading 0.155 opt, containing 275,000 ounces of gold. The Dee mine had a projected mine life of nine years in 1990 and created 100 permanent new jobs with a payroll of $3.0 million per year. Total expenditure on payroll, supplies, services, taxes, and royalties exceeded $7.0 million per year. In 1992, the Dee Mine contained reserves of 5.2 Mt of ore grading 0.049 opt Au. In 1994, a geologic resource of 958,000 oz Au was reported. In 1997, a geologic resource of 400,000 oz Au was reported. Production from the Dee mine from 1987 to 1998 was 445,557 oz Au; production of silver from 1989 to 1996 was reported as 192,322 oz Ag. Last production in 2001 was listed as 2,351 oz gold and 6,028 oz silver.

Structure: The mine area has been affected by folding, thrusting, and high angle faulting. At least three stages of folding are recognized: 1) the oldest set trending N-NE, 2) a set trending N-NW with steep, south-dipping axial planes, 3) a set trending E-W, representing south-directed compression. Two stages of thrusting are represented. Both strike-slip and dip-slip movements are recognized on the high angle structures, but dip-slip movement dominates. NE-trending Basin and Range faults cut both Paleozoic and Tertiary units and displace ore horizons downwards on the southerly and westerly blocks. A few joints trending NE have chalcedonic silica developed along the fracture surfaces. Greybeck (1985) proposes that Dee is located at the leading edge of the Golconda Thrust and that beds exposed in the Dee Mine pit lie on the west flank of a close to tight NNE trending antiform.

Alteration: Silicification and argillization of originally calcareous siltstones and limestones are the dominant alteration effects. Where mineralized, intrusive dikes of intermediate composition are sericitized and often silicified.

Commodity: Ore Materials: native gold Gangue Materials: stibnite, pyrite, barite

Deposit: The Dee Mine consists of several orebodies: the Main Zone; Ridge Zone; North Extension; Deep North; Dx Zone; and South Extension.

Deposit type: Sediment-hosted Au

Development: The original Dee discovery was made in Boulder Creek in 1980 by Whit Delamare, working for Cordex Exploration Co. Subsequent drilling of 247 holes totalling 120,000 ft. located the Main and Ridge orebodies. A mine feasibility study was commissioned in 1982. The production decision was made in April, 1983. Production of mill grade ore began in 1984. A heap leaching operation to treat lower grade ore commenced June 1, 1985. In the 1980s, ownership of the Dee Mine was listed as Cordex Syndicate (Rayrock Yellowknife Resources 44%, International Corona Corp. 44%, Mr. John S. Livermore 12%). The operator at that time was Dee Gold Mining Co. (1983); Art Schwandt, Gen. Mgr., P.O. Box 1193, Elko, Nv 89801. In 1998, the Dee Mine was evaluated for further expansion underground and a two-year underground mine plan was developed. This underground plan coupled with the remaining open-pit reserves was intended to enable Dee to produce over 58,000 ounces per year for the next four years at a cash cost of $197/oz. In 2000, the Dee Mine was still owned and operated by Glamis Gold, Ltd. (2000). The Dee Gold Mine was still listed as an active mine employing 12 persons and producing 2,351 oz gold and 6,028 oz silver in 2001, however it was no longer listed as an active producer in 2002. The Storm Exploration Decline (Storm Decline), an inactive underground gold exploration mine, was a joint venture between Dee Gold Mining Company and Barrick Gold Exploration, Inc. (Barrick), with Barrick having sole managing authority over the mine. Barrick developed the Storm Decline from the lowest level of the Dee Gold Mining Company open pit in March 1999. The decline was developed to explore ore bodies to identify potential gold-bearing ore reserves. Conventional mining methods utilizing drilling, blasting, and trackless haulage were used to advance the decline. The mine was closed during April 2000 and access to it was controlled by locked gates. Barrick reported on the Storm 2004 exploration program. The End Zone drift was completed on schedule and budget with drilling now in progress: 16,500 feet of Core drilling in 49er, Deep North and End Zones completed YTD Test mining was completed at 49er Zone with 1,000 st extracted for metallurgical testing Pre-feasibility study on 49er and Deep North zones in progress

Geology: Western facies, upper plate rocks host the ore.

Ore(s): Northerly- and northwesterly-trending faults and their intersections host gold mineralization. These faults can host gold values exceeding 0.25 opt gold over narrow widths, suggesting that they are the main conduits for gold-bearing hydrothermal fluids. Dikes occupying the faults host small volumes of high grade ore. Economic gold mineralization rarely migrated more than a few feet from the faults.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.


Mineral List


8 valid minerals.

Rock Types Recorded

Note: this is a very new system on mindat.org and data is currently VERY limited. Please bear with us while we work towards adding this information!

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

Acanthite
Formula: Ag2S
Reference: NBMG Bull 106 Geology and Mineral Resources of Elko County, Nevada
Baryte
Formula: BaSO4
Reference: Mineralogical Record (2001) 32:245; U.S. Geological Survey (2005) Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
'Carbonate'
Reference: U.S. Geological Survey (2005) Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Fluorapatite
Formula: Ca5(PO4)3F
Reference: NBMG Spec. Pub. 31 Minerals of Nevada
Fluorapatite var: Carbonate-rich Fluorapatite
Formula: Ca5(PO4,CO3)3(F,O)
Reference: NBMG Spec. Pub. 31 Minerals of Nevada
Gold
Formula: Au
Reference: NBMG Bull 106 Geology and Mineral Resources of Elko County, Nevada; U.S. Geological Survey (2005) Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Pyrite
Formula: FeS2
Reference: NBMG Bull 106 Geology and Mineral Resources of Elko County, Nevada; U.S. Geological Survey (2005) Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Selenium
Formula: Se
Reference: NBMG Spec. Pub. 31 Minerals of Nevada
Senarmontite
Formula: Sb2O3
Reference: NBMG Spec. Pub. 31 Minerals of Nevada
Stibnite
Formula: Sb2S3
Reference: NBMG Bull 106 Geology and Mineral Resources of Elko County, Nevada; U.S. Geological Survey (2005) Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Gold1.AA.05Au
Selenium1.CC.10Se
Group 2 - Sulphides and Sulfosalts
Acanthite2.BA.35Ag2S
Pyrite2.EB.05aFeS2
Stibnite2.DB.05Sb2S3
Group 4 - Oxides and Hydroxides
Senarmontite4.CB.50Sb2O3
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Baryte7.AD.35BaSO4
Group 8 - Phosphates, Arsenates and Vanadates
Fluorapatite8.BN.05Ca5(PO4)3F
var: Carbonate-rich Fluorapatite8.BN.05Ca5(PO4,CO3)3(F,O)
Unclassified Minerals, Rocks, etc.
'Carbonate'-

List of minerals arranged by Dana 8th Edition classification

Group 1 - NATIVE ELEMENTS AND ALLOYS
Metals, other than the Platinum Group
Gold1.1.1.1Au
Semi-metals and non-metals
Selenium1.3.4.1Se
Group 2 - SULFIDES
AmBnXp, with (m+n):p = 2:1
Acanthite2.4.1.1Ag2S
AmBnXp, with (m+n):p = 2:3
Stibnite2.11.2.1Sb2S3
AmBnXp, with (m+n):p = 1:2
Pyrite2.12.1.1FeS2
Group 4 - SIMPLE OXIDES
A2X3
Senarmontite4.3.9.2Sb2O3
Group 28 - ANHYDROUS ACID AND NORMAL SULFATES
AXO4
Baryte28.3.1.1BaSO4
Group 41 - ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
A5(XO4)3Zq
Fluorapatite41.8.1.1Ca5(PO4)3F
var: Carbonate-rich Fluorapatite41.8.1.4Ca5(PO4,CO3)3(F,O)
Unclassified Minerals, Mixtures, etc.
'Carbonate'-

List of minerals for each chemical element

CCarbon
C Fluorapatite (var: Carbonate-rich Fluorapatite)Ca5(PO4,CO3)3(F,O)
OOxygen
O Fluorapatite (var: Carbonate-rich Fluorapatite)Ca5(PO4,CO3)3(F,O)
O SenarmontiteSb2O3
O BaryteBaSO4
O FluorapatiteCa5(PO4)3F
FFluorine
F Fluorapatite (var: Carbonate-rich Fluorapatite)Ca5(PO4,CO3)3(F,O)
F FluorapatiteCa5(PO4)3F
PPhosphorus
P Fluorapatite (var: Carbonate-rich Fluorapatite)Ca5(PO4,CO3)3(F,O)
P FluorapatiteCa5(PO4)3F
SSulfur
S PyriteFeS2
S StibniteSb2S3
S AcanthiteAg2S
S BaryteBaSO4
CaCalcium
Ca Fluorapatite (var: Carbonate-rich Fluorapatite)Ca5(PO4,CO3)3(F,O)
Ca FluorapatiteCa5(PO4)3F
FeIron
Fe PyriteFeS2
SeSelenium
Se SeleniumSe
AgSilver
Ag AcanthiteAg2S
SbAntimony
Sb StibniteSb2S3
Sb SenarmontiteSb2O3
BaBarium
Ba BaryteBaSO4
AuGold
Au GoldAu

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
The Mineralogical Record: 33: 225-234.
Abbott, E., Laux, D., Keith, S., (1992), Geochemistry and Ore Deposits - Influence of Magma Chemistry, In Buffa, R. And Coyner, A., eds., Geology and Ore Deposits of the Great Basin - Field Trip Guidebook Compendium, The Geological Society of Nevada, Reno, p. 568.
Bergwall, F., (1992), Geology of the Dee Gold Mine, in Buffa, R. And Coyner, A., Eds., Geology and Ore Deposits of The Great Basin - Field Trip Guidebook Compendium, The Geological Society of Nevada, Reno, p. 867.
Bagby, W.C., Pickthorn, W.J., And Goldfarb, R.J., (1985), Pathfinder Elements in Soils over the Dee Disseminated Gold Deposit, Elko County, Nevada, in Krafft, K., ed., USGS Research on Mineral Resources-1985, Program and Abstracts, USGS Circular 949, p.1.
Greybeck, J.D., (1985), Geology of the Dee Mine Area, Elko County, Nevada, Unpublished M.S. Thesis, University of Idaho.
Jones, R., (1989), Carlin Trend Gold Belt: The Geology, Mining Magazine, Vol. 161, No. 4, P. 256-261.
Thorstad, L., (1989), Carlin Trend Gold Belt: The Producers, Mining Magazine, Vol. 161, No. 4, P. 263-267.
Ellis, R., (1987), The Dee Gold Mine, Geological Society of Nevada 1987 Fall Field Trip Guidebook, Special Publication No. 6, p. B23-B26.
NBMG, (1991)-2002, The Nevada Mineral Industry 1990-2001, NBMG Special Publication MI-1990-MI-2002.
NBMG, (1994), MI-1993
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.

Other Databases

USGS MRDS Record:10310338

Other Regions, Features and Areas containing this locality

North America PlateTectonic Plate

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