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April Fool Mine

Past Producer in Lincoln county in Nevada, United States with commodities Gold, Silver, Copper, Bismuth, Antimony
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Public Land Survey System information
  6. Commodities
  7. Materials information
  8. Alteration
  9. Host and associated rocks
  10. Nearby scientific data
  11. Geologic structures
  12. Ore body information
  13. Controls for ore emplacement
  14. Economic information about the deposit and operations
  15. Mining district
  16. Land status
  17. Workings at the site
  18. Links to other databases
  19. Bibliographic references
  20. General comments
  21. Reporter information

Geologic information

Identification information

Deposit ID 10037386
MRDS ID M032087
Record type Site
Current site name April Fool Mine
Alternate or previous names Goldcup, April Fool, Swifter Claims, NBMG Sample Locations 1751 and 1752.
Related records 10222321

Geographic coordinates

Geographic coordinates: -114.76556, 37.46247 (WGS84)
Elevation 1920
Relative position ON RIDGE NE OF DELAMAR

Site location context

Political divisions (FIPS codes)

Lincoln(county)

Nevada(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Delamar(quadrangle 1:24,000 scale)

Clover Mountains(quadrangle 1:100,000 scale)

Caliente(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Dry Lake Valley(hydrologic unit)

Central Nevada Desert Basins(hydrologic accounting unit)

Central Nevada Desert Basins(hydrologic subregion)

Great Basin(hydrologic region)

Geographic areas

Country State County
United States Nevada Lincoln

Public Land Survey System information

Meridian Township Range Section Fraction State
06S 64E 01 Nevada

Comments on the location information

  • INFO FROM LAND.ST :1982 1982

Commodities

Commodity Importance
Gold Primary
Silver Primary
Copper Tertiary
Bismuth Critical Tertiary
Antimony Critical Tertiary

Materials information

Materials Type of material
Tetrahedrite Ore
Barite Gangue
Pyrite Gangue
Quartz Gangue

Alteration

  • (Local) Silicification

Analytical data

Result ASSAY NEAR NO. 1 PORPHYRY DIKE GAVE: .08 TO .17 OZ AU/TON, ONE .55 OZ AU/TON OBTAINED .4 TO 5.6 OZ AG/TON. FROM GOLDCUP WORKINGS: .08 OZ AU/TON, 11.03 OZ AG/TON, 1.16% BI, .72% SB. HANDPICKED ORE NEAR SURFACE (1932): .82 OZ AU/TON, 2.7 OZ AG/TON (1933): 2.6 OZ AU/TON, 1.52 OZ AG/TON. SAMPLES 1751 AND 1752 CONTAIN, RESPECTIVELY: 100 PPM MN, 50 AND 30 PPM AG, 200 PPM AS, 0 AND 10 PPM AU, 2000 AND 500 PPM BA, 50 AND 200 PPM BI, 700 AND 500 PPM CU, 50 AND 0 PPM MO, 500 AND 150 PPM PB, 100 AND 2000 PPM SB, 200 AND 0 PPM SR, 300 AND 20 PPM ZR. SAMPLES 1751 AND 1752 CONTAIN, RESPECTIVELY: 100 PPM MN, 50 AND 30 PPM AG, 200 PPM AS, 0 AND 10 PPM AU, 2000 AND 500 PPM BA, 50 AND 200 PPM BI, 700 AND 500 PPM CU, 50 AND 0 PPM MO, 500 AND 150 PPM PB, 100 AND 2000 PPM SB, 200 AND 0 PPM SR, 300 AND 20 PPM ZR.

Host and associated rocks

  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Rhyolite
    Stratigraphic age (youngest) Early Cambrian
  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Mafic Volcanic Rock > Basalt
  • Host or associated Host
    Rock type Metamorphic Rock > Metasedimentary Rock > Quartzite
    Rock unit name Prospect Mountain Quartzite
    Rock description Prospect Mountain Quartzite

Nearby scientific data

(1) -114.76556, 37.46247
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description Abundant Normal Faults
Type of structure Local
Structure description Vein Offset By Rhyolite Dike

Ore body information

  • General form TABULAR
    Strike N 32 E
    Dip 80 W
    Thickness 6.1M
    Length 914.4M
    Width 213.36M

Controls for ore emplacement

  • Quartzite Breccia In Fissure Zone

Comments on the geologic information

  • ORE BODY IS A FISSURE VEIN. MAIN ORE SHOOTS ARE NARROW VEINS LESS THAN 10 FEET WIDE, DIVIDED INTO LENSES BY INTERSECTING GOUGE SEAMS, CONTINUING FOR A LENGTH OF 1500 FEET. THE VEIN CONTAINS MASSES OF BRECCIA WITH CHERTY QUARTZ CEMENT, AND VEINLETS OF CRUSTIFIED AND BANDED "COMB" QUARTZ. THE APRIL FOOL VEIN IS MINERALIZED TO A VARIABLE EXTENT FOR LENGTH OF 3,000 FEET, AT DEPTH OF 700 FEET. IT IS ROUGHLY PARALLEL TO AND 500 TO 700 FEET EAST OF THE DELAMAR VEIN

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Medium
Significant No
Discovery year 1892
Discoverer Frank Wilson And D. A. Reeves
Year of first production 1892

Mining district

District name Delamar (Ferguson) District District

Land status

Ownership category Private

Comments on the production information

  • APRIL FOOL MINE PRODUCTION SECOND IN THE DISTRICT.

Workings at the site

  • Type of workings Underground
    Length 838.2M

Comments on the workings information

  • FOUR MAIN ADIT LEVELS. MAP OF ACCESSIBLE WORKINGS IN THE GOLDCUP TUNNEL AVAILABLE IN CALLAGHAN, 1937. IN 1983 THERE WAS ONE N35W-TRENDING ADIT WHICH TURNED TO THE NE 15 FT BEYOND THE PORTAL. STOPES AND SHAFTS CONTINUE SEVERAL HUNDRED FT UP AND DOWN SLOPE FROM THIS ADIT, ALONG VEIN STRUCTURE. MANY DRILL ROADS IN AREA 5-10 YRS OLD. REMAINS OF TRACK AND OLD STONE CABIN AT ADIT LEVEL. TRENCHING. IN 1983 THERE WAS ONE N35W-TRENDING ADIT WHICH TURNED TO THE NE 15 FT BEYOND THE PORTAL. STOPES AND SHAFTS CONTINUE SEVERAL HUNDRED FT UP AND DOWN SLOPE FROM THIS ADIT, ALONG VEIN STRUCTURE. MANY DRILL ROADS IN AREA 5-10 YRS OLD. REMAINS OF TRACK AND OLD STONE CABIN AT ADIT LEVEL. TRENCHING.

Comments on development

  • CAPTAIN DELAMAR PURCHASED A PART INTEREST IN THE MINE IN 1893. IN 1897 IT WAS EQUIPPED WITH A 10-STAMP MILL. IN 1932-1933, THE MCGUFFIE AND GENTRY LEASE ON THE APRIL FOOL PRODUCED CONSIDERABLE SHIPPING ORE. THE HORN BROTHERS OF DELAMAR WERE DOING A LITTLE MINING AND DEVELOPMENT WORK AND SHIPPING SOME ORE IN 1931. THE MINE EMPLOYED 35 MEN IN 1899, AT WHICH TIME THERE WAS EXTENSIVE MINE EXPLORATION ONGOING. THE APRIL FOOL WAS AMONG THE MINES CONSOLIDATED UNDER BAMBERGER-DELAMAR MINES CO IN 1902. 1983 EXAMINATION INDICATED BACKHOE TRENCHING OF DUMPS AND SORTING OF MATERIAL NEAR WORKINGS DONE 1-2 YEARS AGO.

Reference information

Bibliographic references

  • Deposit

    CALLAGHAN, E., 1937, GEOLOGY OF THE DELMAR DISTRICT, LINCOLN CO., NEV. NEV BUR MINES V. 31. NO. 5 P. 58-60

  • Deposit

    TSCHANZ, C.M., AND PAMPEYAN, E.H., 1970, GEOLOGY AND MINERAL DEPOSITS OF LINCOLN CO., NEV. NEV. BUR MINES BULL 73 P. 141

  • Deposit

    SMITH, A.M. AND CARPENTER, J., 1931, INSPECTION TRIP NOTES: NBMG DISTRICT FILE 167, ITEM 3.

  • Deposit

    NBMG DISTRICT FILE 167, PRESS CLIPPINGS, 1899, 1908.

  • Deposit

    EMMONS, S.F., 1901, AIME TRANS, VOL XXXI, P. 658-682

  • Deposit

    BENTZ, J., AND SMITH, P., 1983, FIELD EXAMINATION REPORT, SEPT 30, 1983.

  • Production

    CALLAGHAN, 1937

General comments

Subject category Comment text
Deposit VEIN IS PARALLEL TO DELAMAR VEIN. VEIN IS OFFSET BY A LATE RHYOLITE DIKE. ORE IS SILICIFIED QUARTZITE BRECCIA AND VEINLETS OF COMB QUARTZ. THIS CONSPICUOUS SILICIFIED RIB OUTCROPS BOLDLY ALONG RIDGECREST ADJACENT TO WORKINGS. RAISE ABOVE ADIT EXPLORES THE VEIN AND EXPOSES A 2-3 FT WIDE ZONE WHICH IS IRON STAINED AND SHOWS SUBPARALLEL SETS OF QUARTZ VEINS WHICH CUT A HIGHLY SILICEOUS QUARTZITE BRECCIA. ON CLOSE EXAMINATION, THE VEIN OUTCROP CONSISTS OF AN IRON-STAINED QUARTZITE BRECCIA CEMENTED WITH JASPERY SILICA OR MORE MASSIVE VITREOUS COCKADE OR COMB QUARTZ. SOME WIDER, MASSIVE, LATE-STAGE QUARTZ VEINS CROSSCUT BRECCIA PARALLEL TO VEIN OUTCROP. UPPER WORKINGS ARE A FAIRLY CONTINUOUS LINE OF SHAFTS AND STOPES OFTEN INCLINED TO THE WEST ALONG DIP OF THE VEIN. THE VEIN OUTCROPS BOLDLY ADJACENT TO AND WEST OF WORKINGS AND CONTINUES UPSLOPE FOR SEVERAL HUNDRED FEET. THE SAMPLED STOPE TRENDS N10-20E AND DIPS 75 NW ALONG VEIN. AT S END OF STOPE, THE VEIN OUTCROP CONSISTS OF PINK ANGULAR
Deposit QUARTZITE FRAGMENTS CEMENTED BY COMB AND DRUSY QUARTZ. PRISMATIC QUARTZ ENCRUSTS VUGS AS DO FINE CRYSTALS OF LATE-STAGE JAROSITE. DARK BANDS IN THE QUARTZ ARE VERY FINE-GRAINED SULFIDES OF WHICH THE ONLY RECOGNIZABLE MINERAL IS PYRITE. FE AND MN OXIDES ARE COMMON. PART OF THE VEIN CONSISTS OF FRACTURED QUARTZITE, AND MALACHITE IS DEPOSITED ALONG FINE FRACTURE SURFACES IN THE QUARTZITE AND ALSO IN THE VEIN MATERIAL. SEVERAL SAMPLES OF QUARTZ VEIN IN OUTCROP AND ON DUMP CONTAIN COARSE CLOTS OF TETRAHEDRITE (MOSTLY OXIDIZED TO CU OXIDES) AND ABUNDANT OXIDIZED AND UNOXIDIZED PYRITE.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-NOV-1979 Harner, Joy L. (Roberts, Ralph J.) U.S. Geological Survey
Updater 01-AUG-1984 La Pointe, D.D. (Tingley, J.V.) U.S. Geological Survey

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

External references

Maps centered on this site

Authoritative Nevada resources

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.