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Neptune Group

Producer in Nicaragua with commodities Gold, Zinc, Copper, Lead, Silver
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Commodities
  6. Materials information
  7. Alteration
  8. Host and associated rocks
  9. Nearby scientific data
  10. Geologic structures
  11. Ore body information
  12. Controls for ore emplacement
  13. Economic information about the deposit and operations
  14. Mining district
  15. Ownership information
  16. Production statistics
  17. Reserves and resources
  18. Workings at the site
  19. Links to other databases
  20. Bibliographic references
  21. General comments
  22. Reporter information

Geologic information

Identification information

Deposit ID 10073109
MRDS ID W018936
Record type Site
Current site name Neptune Group
Alternate or previous names Neptuno, Bonanza Group, Neptune-Eden, Vein Names: Atlas, Foundling, Neblina, Elefante Blanco, Lona Nueva,, Neptune, Nugget, Washington, Guatuza, Tesoro, Toboba, Venus,, Marsa ?, Bonanza

Geographic coordinates

Geographic coordinates: -84.58326, 14.03422 (WGS84)
Elevation 350
Location accuracy 2000(meters)
Relative position ABOUT 120 KM W OF PUERTO CABEZAS. BONANZA (TOWN) 14-02N, 84-36W

Site location context

Political divisions (FIPS codes)

Nicaragua(country)

North America(continent)

Land(continent)

Geographic areas

Country
Nicaragua

Comments on the location information

  • EASTERNMOST GROUP IN PIS PIS DISTRICT.

Commodities

Commodity Importance
Gold Secondary
Zinc Critical Primary
Copper Primary
Lead Primary
Silver Secondary

Comments on the commodity information

  • LESS BASE METAL SULFIDES THAN OTHER 2 GROUPS, NOT MINED FOR BASE METALS.

Materials information

Materials Type of material
Chalcopyrite Ore
Galena Ore
Gold Ore
Chlorite Gangue
Pyrite Gangue
Quartz Gangue

Alteration

  • (Local) Slight Wallrock Replacement, Alteration Abundant

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite
  • Host or associated Host
    Rock type Sedimentary Rock > Clastic Sedimentary Rock > Shale
  • Host or associated Host
    Rock type Sedimentary Rock > Clastic Sedimentary Rock > Siltstone
  • Host or associated Host
    Rock type Sedimentary Rock > Carbonate > Limestone
    Rock unit name Metagalpa;Basement;Basement
    Rock description Metagalpa;Basement;Basement

Nearby scientific data

(1) -84.58326, 14.03422
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description Three Upthrown Blocks With Veins Separated By Two Downthrown Blocks; E-W Dip-Slip Faults With Small To Moderate Horizontal Displacement; Paleocaldera Structures?

Ore body information

  • Length 1500M
    Depth to bottom 400M

Controls for ore emplacement

  • Faults; Ore Shoots Often In Vein Junctions And Branch Points; Second Enrichment In Oxide Zone (50-100 M)

Comments on the geologic information

  • LEAD ISOTOPES INDICATE OLDER BASEMENT SOURCE OF LEAD. CRETACEOUS SEDIMENTS EXPOSED A FEW KM TO THE S OF THE DISTRICT. ACID VOLCANICS AND INTERMEDIATE INTRUSIVES KNOWN IN AREA.

Economic information about the deposit and operations

Development status Producer
Commodity type Metallic
Deposit size Medium
Significant No

Mining district

District name Pis Pis District

Ownership information

  • Type Owner-Operator
    Owner Neptune Mining Co. (Pre-; Inmine
    Last year 1976

Production statistics

  • Year 1975
    Material ORE
    Accuracy Accurate
    Description Ap_Grade: ^5.14 G/Mt Au
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Ore Gold Gold 5g/mt
  • Year 1975
    Material ORE
    Accuracy Accurate
    Description Ap_Grade: ^7.2% Zn, 1.0% Pb, 20.6 G/Mt Ag, 3.43 G/Mt Au
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Ore Gold Gold 3g/mt
    Major Ore Silver Silver 21g/mt
    Major Ore Lead Lead 1wt-pct
    Trace Ore Zinc Zinc 7wt-pct

Comments on the production information

  • MINING ANNUAL REVIEW, 1976, P. 355.

Reserves and resources

  • Type In-situ
    Estimate year 1991
    Commodity Subtype Grade units Group Importance Year
    Gold Au 4.884 g/mt Gold Minor 1991
  • Type In-situ
    Estimate year 1991
    Total resources 351000mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 5.167 g/mt Gold Minor 1991
  • Type In-situ
    Estimate year 1991
    Total resources 134000mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 4.122 g/mt Gold Minor 1991
  • Type In-situ
    Estimate year 1975
    Total resources 1060000000mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 3.7 g/mt Gold Minor 1975
    Zinc Zn 9.78 wt-pct Zinc Major 1975
    Copper Cu 0.44 wt-pct Copper Major 1975
    Lead Pb 1.23 wt-pct Lead Major 1975
    Silver Ag 28.8 g/mt Silver Minor 1975
  • Type In-situ
    Estimate year 1975
    Total resources 55000000mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 14.09 g/mt Gold Minor 1975

Comments on the reserve resource information

  • (1) TOTAL RESERVES AND RESOURCES, INCLUDES (2) AND (3); (2) RESERVES AND RESOURCES OF UNDERGROUND MINE; (3) RESERVES AND RESOURCES OF OPEN PIT MINE. RESERVES INCLUDE ATLAS, FOUNDLING, NEBLINA, ELEFANTE BLANCO, LONA VUEVA, NEPTUNE, NUGGET, WASHINGTON, GUATUZA AND TESORO VEINS. (4) AND (5) ASSURED AND PROBABLE RESERVES FROM MINING JOURNAL.

Workings at the site

  • Type of workings Surface/Underground
    Overall depth 400M

Comments on development

  • DEV$: 3 ; ECON.YEAR: 1973 ; ECON.COM: 450 MTPD SULFIDE MILL. 760 MTPD CYANIDE MILL FOR GOLD. ; MILL.CAP : 450 MTPD

Reference information

Bibliographic references

  • Deposit

    ROBERTS, R.J., IRVING, E.M., 1957, MINERAL DEPOSITS OF CENTRAL AMERICA, U.S. GEOLOGICAL SURVEY BULL. 1034, P. 187-188

  • Reserve-Resource

    MINING ANNUAL REVIEW, 1976, P. 355.

General comments

Subject category Comment text
Deposit MINES OCCUR IN A BELT ABOUT 19 KM LONG, 4.8 KM WIDE (PIS-PIS DISTRICT). SINGLE VEINS UP TO 10 M WIDE, 1.8 KM LONG.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-SEP-1976 Schruben, Paul G. U.S. Geological Survey
Updater 01-FEB-1992 Page, Norman J. U.S. Geological Survey
Updater 01-JUL-1992 Venable, Margaret U.S. Geological Survey

Beyond USGS

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

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