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Bootstrap/Capstone Mine (Antimony Pete Mine; Antimony Ike Mine), Bootstrap Mining District, Elko Co., Nevada, USAi
Regional Level Types
Bootstrap/Capstone Mine (Antimony Pete Mine; Antimony Ike Mine)Mine
Bootstrap Mining DistrictMining District
Elko Co.County
NevadaState
USACountry

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Key
Latitude & Longitude (WGS84):
41° 1' 7'' North , 116° 25' 0'' West
Latitude & Longitude (decimal):
Locality type:
Nearest Settlements:
PlacePopulationDistance
Carlin2,302 (2017)42.9km


Structure: Roberts Mountains Thrust Fault A complex fault zone is exposed along the crest of the Bootstrap window. Steep north trending faults have been intruded by dikes.

Alteration: Host rocks have been affected by pervasive hydrothermal alteration: sericitization, silicification, and argillization. Dikes are sericitized. Within carbonate sediments, cherty replacement silicification along faults and joints diminishes laterally in intensity and grades into argillic alteration. Argillized zones grade into fresh country rock.

Commodity: Ore Materials: gold Gangue Materials: clay, quartz, carbonate

Deposit: Disseminated gold mineralization occurs along a NNE-trending , west-dipping fault zone over two miles long. Ore is localized on a north-striking, high angle fault developed along a competency contrast between massive Devonian Bootstrap carbonates and platform-slope talus debris within the Bootstrap Limestone. West-dipping, late Cretaceous to Tertiary dikes intruded along the fault. Later tectonism accentuated initial structural breaks, enhancing permeability and porosity.Gold occurs as microscopic particles along fractures in quartz latite and dacite dikes, chert, siliceous mudstone, calcareous siltstone, and shale.Host rocks have been affected by sericitization, silicification, and argillization. Dikes are sericitized. Within carbonate sediments, cherty replacement silicification along faults and joints diminishes laterally in intensity and grades into argillic alteration. Argillized zones grade into fresh country rock. Where several dikes are closely spaced, the ore is mineable by open pit methods.

Deposit type: Sediment-hosted Au

Development: The first reported gold production from the Bootstrap deposit was in 1914 from a small underground operation near the NW corner of the present Bootstrap pit. In 1918, approximately 500 tons of stibnite ore were shipped to the railhead at Dunphy, NV. Gold production resumed in 1958 when Harry Treweek and Marion Fischer began mining a small dike immediately west of the present Bootstrap pit. It was the largest gold producer in Elko County in 1958. In 1967, the property was acquired by Newmont, who completed a development drilling program of 76 holes totalling 4,394 meters in 1969. Newmont began mining in 1974, producing 20,000 oz. gold over the next five years by milling and heap leaching. Intermittent mining of high grade zones continued from 1976-1984, produciing an additional 100,000 oz. gold. It was listed as an active open pit mine employing 2 persons in 1980. Capstone was discovered in 1985 by Newmont and heap-leaching of low grade ore continued in 1987. Additional exploration resulted in the discovery of Tara in 1990. The property was inactive in 1991. Production resumed in 1992 with the opening of the contiguous Capstone deposit, and mining began at the Tara deposit in 1997.

Geology: The Bootstrap deposits are aligned along the crest of a N-S-trending horst block, comprised primarily of carbonate rocks of the Devonian Popovich Formation and Siluro-Devonian Roberts Mountains Formation, and siliciclastic rocks of the Devonian Rodeo Creek unit. Within the horst block, rock strata are folded into a broad, S20E-trending gently plunging antiform. Resistant carbonate units and silicified rocks forming the east limb of the antiform form a 2-mile-long, 3000-foot wide, 600-foot high ridge known as the Bootstrap Window. Most of the west limb of the antiform has been down-droped by faults and is only exposed on the west side of the Tara deposit. Dikes are up to 15' wide. Gold occurs as microscopic particles along fractures in the dikes, and in the cherts & shales. Limestone in contact with the dike is hornfelsed and partially marbleized

Ore(s): Ore is localized on a north-striking, high angle fault developed along a competency contrast between massive Devonian Bootstrap carbonates and platform-slope talus debris within the Bootstrap Llimestone. West-dipping, late Cretaceous to Tertiary dikes intruded along the fault. Later tectonism accentuated initial structural breaks, enhancing permeability and porosity. Mineralization is strongly controlled by strata (particularly at Tara) however the dominant control is structural.

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


5 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:

Baryte
Formula: BaSO4
Reference: NBMG Spec. Pub. 31 Minerals of Nevada
Calcite
Formula: CaCO3
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.
Quartz
Formula: SiO2
Reference: NBMG Spec. Pub. 31 Minerals of Nevada; U.S. Geological Survey (2005) Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Stibnite
Formula: Sb2S3
Reference: NBMG Bull 106 Geology and Mineral Resources of Elko County, Nevada

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Gold1.AA.05Au
Group 2 - Sulphides and Sulfosalts
Stibnite2.DB.05Sb2S3
Group 4 - Oxides and Hydroxides
Quartz4.DA.05SiO2
Group 5 - Nitrates and Carbonates
Calcite5.AB.05CaCO3
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Baryte7.AD.35BaSO4

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
Group 2 - SULFIDES
AmBnXp, with (m+n):p = 2:3
Stibnite2.11.2.1Sb2S3
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Group 28 - ANHYDROUS ACID AND NORMAL SULFATES
AXO4
Baryte28.3.1.1BaSO4
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2

List of minerals for each chemical element

CCarbon
C CalciteCaCO3
OOxygen
O BaryteBaSO4
O CalciteCaCO3
O QuartzSiO2
SiSilicon
Si QuartzSiO2
SSulfur
S StibniteSb2S3
S BaryteBaSO4
CaCalcium
Ca CalciteCaCO3
SbAntimony
Sb StibniteSb2S3
BaBarium
Ba BaryteBaSO4
AuGold
Au GoldAu

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Bonham, H.F., (1986), Bulk-Mineable Precious-Metal Deposits and Prospects In Nevada, NBMG Map 91.
NBMG, (1987), The Nevada Mineral Industry 1986, NBMG Special Publication MI-1986
MacLeod, R. (1987) Geology of the Bootstrap mine. In: Symp. Bulk Mineable, Guidebook for Field Trips; ed. Johnson, J.L. Geol. Soc. of Nevada, Reno, NV, USA, 283–284.
Baker, E.D., (1991), Geology and Ore Deposits of the Bootstrap Subdistrict, Elko County, Nevada, in Geology And Ore Deposits of the Great Basin, Raines, G.L., et al., eds., the Geological Society of Nevada, Reno, p. 619-623.
NBMG, (1991), The Nevada Mineral Industry 1990, NBMG Special Publication MI-1990.
Newmont Gold (1985) SEC Form 10K
Geology and Ore Deposits of Northeastern Nevada; Geological Society of Nevada, (1997) Spring Field Trip Guidebook, Special Publication No. 25, p. 55.
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:10310520

Other Regions, Features and Areas containing this locality

North America PlateTectonic Plate

This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.
 
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