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Ren deposit, Bootstrap District, Elko Co., Nevada, USA

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Key
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Latitude & Longitude (WGS84): 41° 0' 53'' North , 116° 23' 16'' West
Latitude & Longitude (decimal): 41.01487,-116.38796
GeoHash:G#: 9rm1rd8bg
Locality type:Deposit
Köppen climate type:BSk : Cold semi-arid (steppe) climate


Small heap leach gold mine.
Structure: steep east-dipping faults The area has been affected by regional thrust faulting.

Alteration: Alteration includes decalcification and weak silicification in siltstone, and formation of massive jasperoid in the upper part of the limestone unit. Alteration of dikes is mainly sericite-quartz-pyrite, with late pyrite-quartz-kaolinite.

Commodity: Ore Materials: gold Gangue Materials: barite

Deposit: The Ren, West Ren and Banshee orebodies are located generally a half mile to a mile northwest and NNW of the Meikle Mine along the northward extension of the Post Fault. Three stages of mineralization include a pre- or syntectonic base metal-barite assemblage, a middle stage of Ag- and Sb-rich jasperoid, and a late Au-rich stage responsible for the economic mineralization at the prospect. The latter two stages of alteration and mineralization were focused along steep east-dipping faults and dikes, and the nearly flat-lying contact between lower massive limestone and laminated calcareous siltstone. Mineralization is present between 380 and 500 m below the surface. The element suite characteristic of Au-stage mineralization includes Au, As, and Hg with minor Ag and Hg; Ag and Sb are most enriched in the earlier jasperoid event. Haloes of As and Hg extend at least 80 m above the Au mineralization, but no anomalies are present at the surface. Gold anomalies are more widespread, and extend to shallower depths, but are less coherent.

Deposit type: Sediment-hosted Au

Development: In 1997, Banshee was owned by Newmont Gold Co. but in 1999, it was part of a multi-property land swap with Barrick wherein Barrick acquired Banshee and other properties. In 1998, REN ownership was held byRomarco Minerals, Inc. and Uranerz USA, Inc. but Ren and West Ren were owned by Cameco Corporation in 2000. In 2000-2001, it was reported that the extension of an exploration drift from the Meikle Mine to Banshee had been deferred until the exploration program had better defined the mineralization zone. In 2002, Cameco Gold Inc. reported the discovery of high-grade gold mineralization at the REN project. Fourteen holes drilled over a three-year period have returned highgrade intercepts, including assayed grades ranging from 0.23 opt Au over 95 feet to 1.6 opt Au over 80 feet. Exploration results obtained in the previous six months from five of these holes confirmed that the mineralization extends at least 650 feet in length. Mineralization occurs 2,300 to 2,950 feet below surface and further drilling will be required to define the extent of mineralization, which remains open in three directions. Cameco planned to accelerate exploration efforts to further delineate the discovery. At that time, Cameco Gold was the operator and majority owner (62.14%) of the REN project, with Homestake Mining Corporation, a wholly owned subsidiary of Barrick Gold Corporation, owning the remaining interest (37.86%) in the joint venture. In May, 2004, Cameco Corporation is announced the transfer of its gold assets held by its subsidiary Cameco Gold Inc. to a new Canadian company called Centerra Gold Inc. This transfer would include ownership of the Ren property. In 2006, Centerra Gold Inc. announced that recent drill results at the REN Project include 876.3-880.9 meters @ 0.125 opt Au (RU-105-W1); 874.5-894.4 meters @ 0.032 opt Au (RU- 105-W2) and 857.4-860.5 meters @ 0.164 opt Au (RU-105- W3).

Geology: The Ren mine area is underlain mainly by Paleozoic sedimentary rocks, consisting of limestone, calcareous siltstone, and mudstone of the eastern (carbonate) assemblage, overlain in thrust contact by chert, quartzite, and mudstone of the western (siliceous) assemblage. Cretaceous(?) granodiorite porphyry and hornblende porphyry dikes have intruded the sedimentary rocks along north-striking faults. Three stages of mineralization include a pre- or syntectonic base metal-barite assemblage, a middle stage of Ag- and Sb-rich jasperoid, and a late Au-rich stage responsible for the economic mineralization at the prospect. The latter two stages of alteration and mineralization were focused along steep east-dipping faults and dikes, and the nearly flat-lying contact between lower massive limestone and laminated calcareous siltstone. Mineralization is present between 380 and 500 m below the surface. The element suite characteristic of Au-stage mineralization includes Au, As, and Hg with minor Ag and Hg; Ag and Sb are most enriched in the earlier jasperoid event. Haloes of As and Hg extend at least 80 m above the Au mineralization, but no anomalies are present at the surface. Gold anomalies are more widespread, and extend to shallower depths, but are less coherent.

Ore(s): The later two stages of alteration and mineralization were focused along steep east-dipping faults and dikes, and the nearly flat-lying contact between lower massive limestone and laminated calcareous siltstone.

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


2 valid minerals.

Detailed Mineral List:

'commodity:Antimony'
Formula: Sb
Reference:  
'commodity:Arsenic'
Formula: As
Reference:  
Baryte
Formula: BaSO4
Reference: U.S. Geological Survey (2005) Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Gold
Formula: Au
Reference: U.S. Geological Survey (2005) Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
'commodity:Gold'
Formula: Au
Reference:  
'commodity:Mercury'
Formula: Hg
Reference:  
'commodity:Silver'
Formula: Ag
Reference:  

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
'Gold'1.AA.05Au
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
'Baryte'7.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 28 - ANHYDROUS ACID AND NORMAL SULFATES
AXO4
Baryte28.3.1.1BaSO4

List of minerals for each chemical element

OOxygen
O BaryteBaSO4
SSulfur
S BaryteBaSO4
BaBarium
Ba BaryteBaSO4
AuGold
Au GoldAu

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Quaternary - Miocene
0 - 23.03 Ma



ID: 3185380
Cenozoic sedimentary rocks

Age: Cenozoic (0 - 23.03 Ma)

Lithology: Sedimentary rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Devonian - Ordovician
358.9 - 485.4 Ma



ID: 2726317
Slope Assemblage - Calcareous shale, siltstone, chert, quartzite, and greenstone

Age: Paleozoic (358.9 - 485.4 Ma)

Stratigraphic Name: Vinini Formation; Clipper Canyon Group

Description: Calcareous shale, siltstone, sandstone, chert, quartzite, and greenstone in the Vinini Formation in Lander, Eureka, Elko, and northern Nye Counties, and the Clipper Canyon Group in the northern Toquima Range are the core rocks of unit DOts. Difficulties in identifying distinct paleogeographic settings within Ordovician slope facies rocks are discussed in Finney and Perry (1991) and Finney and others (1993). On a regional scale, the distinction between this unit and rocks traditionally mapped as the Valmy Formation (DCs) is the preponderance of shale and siltstone of cratonal derivation that is present in the Vinini rocks but less common in the Valmy rocks. Both rock units contain bedded chert, massive quartzite, and greenstone (Finney and Perry, 1991) in many places. Many lower Paleozoic rocks grouped here likely formed in a basinal rather than slope setting, but the presence of more common siliciclastic horizons of shale, siltstone, and sandstone distinguish them as a regional grouping from the lower Paleozoic Basin assemblage rocks. Whether this is a function of distinct paleogeographic settings of coeval units as interpreted by early workers, or is actually an age distinction of older (Valmy) versus younger (Vinini) Ordovician rocks, as suggested more recently for at least the Roberts Mountains (Finney, Perry, and others, 1993), remains to be determined on a regional scale. Originally thought to be primarily Ordovician, studies and biostratigraphic data have demonstrated that this unit consists of tightly imbricated Devonian, Silurian, and Ordovician rocks (Coles and Snyder, 1985; Noble and Finney, 1999). The distinction between units DOts and DCs as currently mapped on a regional scale is ambiguous in many places. Identifying the numerous occurrences of Devonian and Silurian rocks that are embedded within this unit on a regional scale would significantly enhance our understanding of the complex structural history of these rocks. These rocks are everywhere in structural contact with other Paleozoic rocks including units IPMcl, Pacl, Dc, MDst, DSt, DSc, and Dcd. Stratigraphic correlation has been made between rocks of the Vinini Formation and the Carbonate shelf sequence in Nevada (Finney and Perry, 1991) on the basis of occurrence of quartzite that is coeval with the shelf unit Ocq. While this does suggest a connection between the Ordovician rocks of this composite unit and North America, the quartzite was deposited along a 1,000-mile length of the margin (Ketner, 1986) and thus does not constrain the rocks of unit DOts to deposition along a specific section of the margin. These rocks are unconformably overlain sporadically by units Pacl and PIPacl, and post-Paleozoic cover rocks.

Comments: Original map source: Crafford, A.E.J., 2007, Geologic Map of Nevada: U.S. Geological Survey Data Series 249, 1 CD-ROM, 46 p., 1 plate; Scale 1:250,000.

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Albino, George, (1994), Geology and lithogeochemistry of the Ren gold prospect, Elko County, Nevada; the role of rock sampling in exploration for deep Carlin-type deposits; Journal of Geochemical Exploration, vol.51, no.1, pp.37-58.
EIS, (1996), Bootstrap, NBMG Miing District file 45, item I21
Long, K.R., DeYoung, J.H., Jr., and Ludington, S.D., (1998), Database of significant deposits of gold, silver, copper, lead, and zinc in the United States; Part A, Database description and analysis; part B, Digital database: U.S. Geological Survey Open-File Report 98-206, 33 p., one 3.5 inch diskette.
Centerra press release, Oct, (2006).


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