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Tusc pit (Tusc ore body), Gold Quarry Mine (Maggie claims; Nevada Bureau of Mines & Geology Sample Site No. 1560; Deep West Ore Body), Maggie Creek Subdistrict, Carlin Trend, Eureka Co., Nevada, USA

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Key
Lock Map
Latitude & Longitude (WGS84): 40° 48' 11'' North , 116° 14' 10'' West
Latitude & Longitude (decimal): 40.80310,-116.23625
GeoHash:G#: 9rm24gzr7
Locality type:Pit
Köppen climate type:BSk : Cold semi-arid (steppe) climate


Structure: The Good Hope fault system which strikes N40W and dips steeply SW is a narrow reverse fault that strikes N45W and has highly variable dip. It connects Tusc to Gold Quarry. At Tusc, it juxtaposes Roberts Mountains Formation and the Rodeo Creek Unit. Anticlinal folding has warped host rocks in the mine area

Alteration: Argillization, decalcification, silicification, and baritization are the dominant forms of alteration. Most of Tusc is weakly to moderately argillized. Intense argillization occurs in some fault zones. Decalcification is strong to moderate. Along most faults, silicification is intense and jasperoids are common. Baritization is of minor importance, occurring as thin discontinuous veins associated with areas of intense silicification.

Commodity: Ore Materials: gold Gangue Materials: kaolinite, alunite, sericite (or illite), barite, hematite.

Deposit: Submicroscopic, epithermal gold mineralization is disseminated along fractures and pores in the Roberts Mountains Formation and the Rodeo Creek Unit. The Tusc orebody has a synformal character which plunges to the northwest.

Deposit type: Sediment-hosted Au

Development: Tusc was discovered in 1985 by Newmont geologists during a reconnaissance exploration program focused on geochemical and geological targets to the northwest of Gold Quarry. The deposit was in the advanced exploration/mine design stage in 1992, and production began in 1994.

Ore(s): A system of several coalescing faults subparallel to and related to the Good Hope Fault is interpreted to be the conduit for gold-bearing hydrothermal fluids. A majority of ore is hosted by Roberts Mountains Formation and 15% of ore hosted by Rodeo Creek Unit.

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


18 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:

Alunite
Formula: KAl3(SO4)2(OH)6
Reference: U.S. Geological Survey (2005) Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
'commodity:Antimony'
Formula: Sb
Reference:  
'Argillite'
Reference: U.S. Geological Survey (2005) Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
'commodity:Arsenic'
Formula: As
Reference:  
Arsenopyrite
Formula: FeAsS
Reference: U.S. Geological Survey (2005) Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Baryte
Formula: BaSO4
Reference: J.B. Harlan, D.A. Harris, P.M. Mallette, J.W. Norby, J.C. Rota, and J.J. Sagar (2002) Geology and Mineralization of the Maggie Creek District. in Gold Deposits of the Carlin Trend , NBMG Bulletin 111 pp 115-142.; U.S. Geological Survey (2005) Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Calcite
Formula: CaCO3
Reference: Rob Lavinsky (ex. Robert Whitmore specimen); U.S. Geological Survey (2005) Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
'Chert'
Reference: U.S. Geological Survey (2005) Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Cinnabar
Formula: HgS
Reference: U.S. Geological Survey (2005) Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
'commodity:Copper'
Formula: Cu
Reference:  
Galena
Formula: PbS
Reference: U.S. Geological Survey (2005) Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Gold
Formula: Au
Reference: J.B. Harlan, D.A. Harris, P.M. Mallette, J.W. Norby, J.C. Rota, and J.J. Sagar (2002) Geology and Mineralization of the Maggie Creek District. in Gold Deposits of the Carlin Trend , NBMG Bulletin 111 pp 115-142.; U.S. Geological Survey (2005) Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
'commodity:Gold'
Formula: Au
Reference: From USGS MRDS database
Hematite
Formula: Fe2O3
Reference: U.S. Geological Survey (2005) Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Hemimorphite
Formula: Zn4Si2O7(OH)2 · H2O
Reference: NBMG Spec. Pub. 31 Minerals of Nevada
Jarosite
Formula: KFe3+ 3(SO4)2(OH)6
Reference: J.B. Harlan, D.A. Harris, P.M. Mallette, J.W. Norby, J.C. Rota, and J.J. Sagar (2002) Geology and Mineralization of the Maggie Creek District. in Gold Deposits of the Carlin Trend , NBMG Bulletin 111 pp 115-142.
Kaolinite
Formula: Al2(Si2O5)(OH)4
Reference: J.B. Harlan, D.A. Harris, P.M. Mallette, J.W. Norby, J.C. Rota, and J.J. Sagar (2002) Geology and Mineralization of the Maggie Creek District. in Gold Deposits of the Carlin Trend , NBMG Bulletin 111 pp 115-142.; U.S. Geological Survey (2005) Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
'commodity:Lead'
Formula: Pb
Reference:  
'Limestone'
Reference: U.S. Geological Survey (2005) Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
'Limonite'
Formula: (Fe,O,OH,H2O)
Reference: J.B. Harlan, D.A. Harris, P.M. Mallette, J.W. Norby, J.C. Rota, and J.J. Sagar (2002) Geology and Mineralization of the Maggie Creek District. in Gold Deposits of the Carlin Trend , NBMG Bulletin 111 pp 115-142.
'commodity:Mercury'
Formula: Hg
Reference:  
Montmorillonite
Formula: (Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
Reference: J.B. Harlan, D.A. Harris, P.M. Mallette, J.W. Norby, J.C. Rota, and J.J. Sagar (2002) Geology and Mineralization of the Maggie Creek District. in Gold Deposits of the Carlin Trend , NBMG Bulletin 111 pp 115-142.
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Reference: J.B. Harlan, D.A. Harris, P.M. Mallette, J.W. Norby, J.C. Rota, and J.J. Sagar (2002) Geology and Mineralization of the Maggie Creek District. in Gold Deposits of the Carlin Trend , NBMG Bulletin 111 pp 115-142.
Muscovite var: Illite
Formula: K0.65Al2.0[Al0.65Si3.35O10](OH)2
Reference: U.S. Geological Survey (2005) Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Muscovite var: Sericite
Formula: KAl2(AlSi3O10)(OH)2
Reference: J.B. Harlan, D.A. Harris, P.M. Mallette, J.W. Norby, J.C. Rota, and J.J. Sagar (2002) Geology and Mineralization of the Maggie Creek District. in Gold Deposits of the Carlin Trend , NBMG Bulletin 111 pp 115-142.; U.S. Geological Survey (2005) Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Pyrite
Formula: FeS2
Reference: U.S. Geological Survey (2005) Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Quartz
Formula: SiO2
Reference: J.B. Harlan, D.A. Harris, P.M. Mallette, J.W. Norby, J.C. Rota, and J.J. Sagar (2002) Geology and Mineralization of the Maggie Creek District. in Gold Deposits of the Carlin Trend , NBMG Bulletin 111 pp 115-142.; U.S. Geological Survey (2005) Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Realgar
Formula: As4S4
Reference: U.S. Geological Survey (2005) Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
'Siltstone'
Reference: U.S. Geological Survey (2005) Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
'commodity:Silver'
Formula: Ag
Reference:  
Sphalerite
Formula: ZnS
Reference: J.B. Harlan, D.A. Harris, P.M. Mallette, J.W. Norby, J.C. Rota, and J.J. Sagar (2002) Geology and Mineralization of the Maggie Creek District. in Gold Deposits of the Carlin Trend , NBMG Bulletin 111 pp 115-142.
Stibnite
Formula: Sb2S3
Reference: U.S. Geological Survey (2005) Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
'commodity:Zinc'
Formula: Zn
Reference:  

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
'Gold'1.AA.05Au
Group 2 - Sulphides and Sulfosalts
'Arsenopyrite'2.EB.20FeAsS
'Cinnabar'2.CD.15aHgS
'Galena'2.CD.10PbS
Pyrite2.EB.05aFeS2
Realgar2.FA.15aAs4S4
Sphalerite2.CB.05aZnS
Stibnite2.DB.05Sb2S3
Group 4 - Oxides and Hydroxides
'Hematite'4.CB.05Fe2O3
Quartz4.DA.05SiO2
Group 5 - Nitrates and Carbonates
'Calcite'5.AB.05CaCO3
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
'Alunite'7.BC.10KAl3(SO4)2(OH)6
'Baryte'7.AD.35BaSO4
Jarosite7.BC.10KFe3+ 3(SO4)2(OH)6
Group 9 - Silicates
'Hemimorphite'9.BD.10Zn4Si2O7(OH)2 · H2O
Kaolinite9.ED.05Al2(Si2O5)(OH)4
Montmorillonite9.EC.40(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
var: Illite9.EC.15K0.65Al2.0[Al0.65Si3.35O10](OH)2
var: Sericite9.EC.15KAl2(AlSi3O10)(OH)2
Unclassified Minerals, Rocks, etc.
'Argillite'-
'Chert'-
Limestone-
Limonite-(Fe,O,OH,H2O)
Siltstone-

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
AmXp, with m:p = 1:1
Cinnabar2.8.14.1HgS
Galena2.8.1.1PbS
Realgar2.8.21.1As4S4
Sphalerite2.8.2.1ZnS
AmBnXp, with (m+n):p = 2:3
Stibnite2.11.2.1Sb2S3
AmBnXp, with (m+n):p = 1:2
Arsenopyrite2.12.4.1FeAsS
Pyrite2.12.1.1FeS2
Group 4 - SIMPLE OXIDES
A2X3
Hematite4.3.1.2Fe2O3
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Group 28 - ANHYDROUS ACID AND NORMAL SULFATES
AXO4
Baryte28.3.1.1BaSO4
Group 30 - ANHYDROUS SULFATES CONTAINING HYDROXYL OR HALOGEN
(AB)2(XO4)Zq
Alunite30.2.4.1KAl3(SO4)2(OH)6
Jarosite30.2.5.1KFe3+ 3(SO4)2(OH)6
Group 56 - SOROSILICATES Si2O7 Groups, With Additional O, OH, F and H2O
Si2O7 Groups and O, OH, F, and H2O with cations in [4] coordination
Hemimorphite56.1.2.1Zn4Si2O7(OH)2 · H2O
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Muscovite71.2.2a.1KAl2(AlSi3O10)(OH)2
var: Illite71.2.2d.2K0.65Al2.0[Al0.65Si3.35O10](OH)2
Sheets of 6-membered rings with 2:1 clays
Montmorillonite71.3.1a.2(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Unclassified Minerals, Rocks, etc.
'Argillite'-
'Chert'-
Kaolinite-Al2(Si2O5)(OH)4
'Limestone'-
'Limonite'-(Fe,O,OH,H2O)
Muscovite
var: Sericite
-KAl2(AlSi3O10)(OH)2
'Siltstone'-

List of minerals for each chemical element

HHydrogen
H AluniteKAl3(SO4)2(OH)6
H HemimorphiteZn4Si2O7(OH)2 · H2O
H Muscovite (var: Illite)K0.65Al2.0[Al0.65Si3.35O10](OH)2
H JarositeKFe3+ 3(SO4)2(OH)6
H KaoliniteAl2(Si2O5)(OH)4
H Limonite(Fe,O,OH,H2O)
H Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
H MuscoviteKAl2(AlSi3O10)(OH)2
H Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
CCarbon
C CalciteCaCO3
OOxygen
O AluniteKAl3(SO4)2(OH)6
O BaryteBaSO4
O CalciteCaCO3
O HematiteFe2O3
O HemimorphiteZn4Si2O7(OH)2 · H2O
O Muscovite (var: Illite)K0.65Al2.0[Al0.65Si3.35O10](OH)2
O JarositeKFe3+ 3(SO4)2(OH)6
O KaoliniteAl2(Si2O5)(OH)4
O Limonite(Fe,O,OH,H2O)
O Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
O MuscoviteKAl2(AlSi3O10)(OH)2
O QuartzSiO2
O Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
NaSodium
Na Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
MgMagnesium
Mg Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
AlAluminium
Al AluniteKAl3(SO4)2(OH)6
Al Muscovite (var: Illite)K0.65Al2.0[Al0.65Si3.35O10](OH)2
Al KaoliniteAl2(Si2O5)(OH)4
Al Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
Al MuscoviteKAl2(AlSi3O10)(OH)2
Al Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
SiSilicon
Si HemimorphiteZn4Si2O7(OH)2 · H2O
Si Muscovite (var: Illite)K0.65Al2.0[Al0.65Si3.35O10](OH)2
Si KaoliniteAl2(Si2O5)(OH)4
Si Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
Si MuscoviteKAl2(AlSi3O10)(OH)2
Si QuartzSiO2
Si Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
SSulfur
S AluniteKAl3(SO4)2(OH)6
S ArsenopyriteFeAsS
S BaryteBaSO4
S CinnabarHgS
S GalenaPbS
S JarositeKFe3+ 3(SO4)2(OH)6
S PyriteFeS2
S RealgarAs4S4
S SphaleriteZnS
S StibniteSb2S3
KPotassium
K AluniteKAl3(SO4)2(OH)6
K Muscovite (var: Illite)K0.65Al2.0[Al0.65Si3.35O10](OH)2
K JarositeKFe3+ 3(SO4)2(OH)6
K MuscoviteKAl2(AlSi3O10)(OH)2
K Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
CaCalcium
Ca CalciteCaCO3
Ca Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
FeIron
Fe ArsenopyriteFeAsS
Fe HematiteFe2O3
Fe JarositeKFe3+ 3(SO4)2(OH)6
Fe Limonite(Fe,O,OH,H2O)
Fe PyriteFeS2
ZnZinc
Zn HemimorphiteZn4Si2O7(OH)2 · H2O
Zn SphaleriteZnS
AsArsenic
As ArsenopyriteFeAsS
As RealgarAs4S4
SbAntimony
Sb StibniteSb2S3
BaBarium
Ba BaryteBaSO4
AuGold
Au GoldAu
HgMercury
Hg CinnabarHgS
PbLead
Pb GalenaPbS

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: 2986162
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)
Schull, H.W., (1991), The Lithostratigraphy and Sedimentology of the Contact/Transition Between the Roberts Mountains Formation and the Western Facies Rocks in the Carlin Mining District, Eureka and Elko Counties, Nevada, in Raines, G.L., et al., eds., The Geology and Ore Deposits of the Great Basin, The Geological Society of Nevada, Reno, p. 705-712.
Ekburg, C., Rota, J., and Arkell, B., (1991), Geology and Mineral Deposits of the Maggie Creek Subdistrict, Carlin Trend, Eureka County, Nevada, in Raines, G.L., et al., eds., The Geology and Ore Deposits of the Great Basin, The Geological Society of Nevada, Reno, p. 625-633.
Rota, J., (1990), Geology and Mineral Deposits of the Maggie Creek Subdistrict, Carlin Trend, Eureka County, Nevada, Oral Presentation at Great Basin Symposium, The Geological Society of Nevada, Sparks, NV, April, 1990.
Arkell, B., (1992), Geology of the Tusc and Mac Deposits, 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. 862-864.
Mcfarlane, D., (1992), Gold Production on the Carlin Trend, 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. 841-843.
NBMG, (1994), MI-1993
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.
John W. Norby and Michael J.T. Orobona, (2002), Geology and Mineral Systems of the Mike Deposit; in Gold Deposits of the Carlin Trend, NBMG Bull. 111.
MINING JOURNAL, V308, # (7915), MAY 1, 1987, P332, INDUSTRY IN ACTION, MORE GOLD FOR NEWMONT...
EKBURG, C. E., ROTA, J. C., AND B. W. ARKELL. GEOLOGY AND MINERAL DEPOSITS OF THE MAGGIE CREEK SUBDISTRICT, CARLIN TREND, EUREKA COUNTY, NEVADA: IN GEOLOGY AND ORE DEPOSITS OF THE GREAT BASIN PUBLISHED BY THE GEOLOGICAL SOCIETY OF NEVADA, (1991), PP. 625-633.
U.S. BUR. LAND MANAGEMENT. NEWMONT GOLD COMPANY'S SOUTH OPERATIONS AREA PROJECT. DRAFT EIS, MAY (1993).


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