Afterthought

Site Name

Primary: Afterthought
Secondary: Copper King
Secondary: Quinn-Newman
Secondary: Hunchback
Secondary: Eureka
Secondary: Riovista
Secondary: Molalla

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Commodity

Primary: Gold
Primary: Zinc
Primary: Molybdenum
Primary: Lead
Primary: Iron
Primary: Copper

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Location

State: Nevada
County: Churchill

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Land Status

Not available

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Holdings

Not available

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Workings

Type: Surface/Underground

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Ownership

Not available

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Production

Not available

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Deposit

Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
Discovery Year: 1963
Years of Production:
Organization:
Significant: N
Deposit Size: S

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Physiography

Not available

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Mineral Deposit Model

Model Name: Skarn Fe

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Orebody

Not available

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Structure

Type: R
Description: Walker Lane, In An Area With Right Lateral N20w To N40w Faults Which Correlate With Other Areas Of Possible Mineralization (Boulder, Hottentot, Calico) (Satkoski, P. 78). Nw Faults Offset In Places By Ne Faults.

Type: L
Description: Shearing. Fault Trending N50e Separates Quartz Monzonite From More Massive Granodionite. Later Quartz Veins.

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Alterations

Alteration Type: L
Alteration Text: Calc-Silicates, Silification, Argilization, Biotite

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Rocks

Name: Rhyolite
Role: Associated
Age Type: Associated Rock
Age Young: Late Jurassic

Name: Rhyolite
Role: Associated
Age Type: Host Rock
Age Young: Late Triassic

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Analytical Data

Analytical Data: DRILL RESULTS GIVEN IN DETAIL IN SATKOSKI AND OTHERS. MAXIMUM VALUES WERE 951 PPM CU AND 46 PPM MO BETWEEN 40-70' IN HOLE AF-18, QUARTZ VEIN SAMPLE (WR-10) RETURNED 64 PPM AG (1.87 OZ/TON). THE CERT STUDY (1984) MENTIONS ANOMALOUS AU, BI, PB, AG, ZN, AS, CU, AND V VALUES.

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Materials

Ore: Quartz
Ore: Calcite
Ore: Graphite
Ore: Stilbite
Ore: Malachite
Ore: Silver
Ore: Cerargyrite
Ore: Limonite
Ore: Molybdenite
Ore: Gold
Ore: Pyrite
Ore: Tourmaline
Ore: Argentite
Ore: Chalcopyrite
Ore: Hematite

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Comments

Comment (Location): UTM TAKEN ON AF SHAFT (LABELLED ON PLATE 11 OF SATKOSKI); SHOWN , NOT LABELLED ON WEBER DAM 7.5. SOUTHERN PAINTED MESA AREA. NOT IN CALICO HILLS.

Comment (Development): 20 HOLES, TOTALLING MORE THAN 6,500 FEET. ROTARY OR CORE DRILLED LOW GRADE BASE METALS WERE FOUND IN DEEPER HOLES. GEOPHYSICAL SURVEY RESULTS WERE REPORTED IN 1970. GEOCHEMICAL SURVEYS FOUND 0.56% AND 0.86% CU (SATKOSKI). WORK ON OLDER PROPERTIES (SYNONYMS) OCCURRED PRIOR TO 1913. ; ECON.COM: THE USBM STUDY (SATKOSKI AND OTHERS P. 80) STATED THAT "FURTHER EVALUATION OF THIS AREA... IS NOT [CURRENTLY (1985)] WARRENTED," BUT NOTES THAT DEEPER BASE METAL VALUES MAY BE OF FUTURE INTEREST.

Comment (Deposit): AFTERTHOUGHT IS A BLIND PROSPECT. APPARENTLY BENEATH DEPOSITS DESCRIBED BY SCHRADER IP/RESISTIVITY SURVEYS FOUND ANOMALIES IN THIS AREA. THE SPECIFIC LOCATIONS OF COPPER KING, QUINN-NEWMAN, HUNCHBACK, EUREKA, RIOVISTA, MOLALLA ARE NOT KNOWN. THEY ARE INCLUDED HERE ALONG WITH INFORMATION FROM SCHRADER BECAUSE THEY APPEAR TO LIE WITHIN THE MORE RECENTLY IDENTIFIED AFTERTHOUGHT PROSPECT. ; INFO.SRC : 1 PUB LIT

Comment (Deposit): SERIES OF 10 OR MORE VEINS THAT STRIKE N75E AND DIP STEEPLY S. A FEW VEINS IN THE SOUTHERN PART OF THE AREA DIP N. VEINS ARE 3-20 FT. WIDE AND MAY EXTEND FOR 1 MILE. COPPER KING VEIN IS 4 FT. WIDE, DIPS 70 S, REPORTEDLY CONTAINED 10% CU, 30 OZ. AG, AND $2.00 AU/TON (SCHRADER, P. 294). EUREKA LODE IN A SHEAR ZONE, STIKES N60E, DIPS 80S. IT IS LONGER THAN 3,000 FT. AND 60 FT. WIDE IN PLACES. A 10-12 IN. WIDTH OF VEIN REPORTEDLY AVERAGED "50 PERCENT AND 22 OUNCES OF AG AND $3.40 IN GOLD"/TON. TIOVISTA REPORTEDLY CARRIED ORE AVERAGING $6.50 (AU)/TON (SCHRADER).

Comment (Geology): SCHRADER (P. 293) REPORTS POSSIBLE GENETIC RELATIONSHIP BETWEEN ORE AND QUARTZ MONZONITE.

Comment (Workings): 2 SHAFT SYMBOLS, NUMEROUS PROSPECT AND ADIT SYMBOLS ARE SHOWN ON WEBER DAM 7.5 FT. SCHRADER (P. 293 STATES THAT THE CONTACT ZONE EXTENDS, "FROM THE EUREKA GROUND IN THE NE PART OF THE AREA, WSW ACROSS) THE APPEAL TO REASON AND NEIGHBORING GROUND." COPPER KING SHAFT, IN QUARTZ MONZONITE, IS 17 FT. DEEP. RIOVISTA WAS EXPLORED BY AN 80 FT. ADIT, TO A DEPTH OF 50 FT.

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References

Reference (Deposit): SCHRADER, F.C., 1947, CARSON SINK AREA, NEVADA, USGS, UNPUBLISHED REPORT BASED ON FIELD WORK 1911-1920, IN NBMG FILES.

Reference (Deposit): SATKOWSKI, J.J., LAMBETH, R.H., WHITE, W.W., AND DUNN, M.D., 1985, FIELD INVENTORY OF THE MINERAL RESOURCES AND COMPILATION OF EXPLORATION DATA, WALKER RIVER INDIAN RESERVATION, NV., USBM, BIA REPORT 21-11.

Reference (Deposit): JOHN, D.A., AND SHERLOCK, M.G., 1991, MAP SHOWING MINES AND PROSPECTS IN THE RENO 1 X 2 QUAD, NV AND CA, USGS MF 2154B, SYMBOL T6.

Reference (Deposit): COUNCIL OF ENERGY RESOURCE TRIBES, 1984, AN ASSESSMENT OF HYDROTHERMAL SYSTEMS ON PORTIONS OF THE WALKER RIVER RESERVATION, AS RELATED TO THE FORMATION OF ENERGY AND METAL ACCUMULATIONS, UNPUBLISHED REPORT 07-36-38-557.

Reference (Deposit): BENWAY DISTRICT, LYON COUNTY, UNPUBLISHED MINING DISTRICT FILES (TINGLEY), NBMG.

Reference (Deposit): LAWRENCE, E.F., 1969, GEOLOGICAL AND GEOPHYSICAL INVESTIGATIONS OF THE MINERAL DEPOSITS OF THE CALICO AREA, MINERAL COUNTY, NV, UNIVERSITY OF CALIFORNIA, PH. D. DISSERTATION.

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Nevada Gold

Nevada has a total of 368 distinct gold districts. Of the of those, just 36 are major producers with production and/or reserves of over 1,000,000 ounces, 49 have production and/or reserves of over 100,000 ounces, with the rest having less than 100,000 ounces. Read more: Gold Districts of Nevada.