Sumdum South Copper-Zinc Prospect

Site Name

Primary: Sumdum South Copper-Zinc Prospect
Secondary: Areas No. 4

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Commodity

Primary: Copper
Primary: Zinc
Tertiary: Lead
Tertiary: Gold
Tertiary: Silver

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Location

State: Alaska
District: Petersburg

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Land Status

Land ownership: National Forest
Note: the land ownership field only identifies whether the area the mine is in is generally on public lands like Forest Service or BLM land, or if it is in an area that is generally private property. It does not definitively identify property status, nor does it indicate claim status or whether an area is open to prospecting. Always respect private property.

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Holdings

Not available

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Workings

Not available

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Ownership

Owner Name: Cities Service Minerals Corp.
Home Office: P.O. Box 300, Tulsa, Ok 74102
Years: 1974 -

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Production

Not available

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Deposit

Record Type: Site
Operation Category: Prospect
Operation Type: Unknown
Discovery Year: 1958
Years of Production:
Organization:
Significant: N
Deposit Size: S

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Physiography

Not available

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Mineral Deposit Model

Not available

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Orebody

Form: LENS, TABULAR

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Structure

Type: L
Description: Foliation Follows Folds, Strikes N 20 Degrres-45 Degrees W, Dips Steeply Ne. Faults Strike Nw

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Alterations

Not available

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Rocks

Not available

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Analytical Data

Analytical Data: UP TO 0.78% CU, 2.2% ZN, 900 PPM PB, 22.6 PPM AG, 1.5 PPM AU-USGS B 1525, TABLE 29, AREA

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Materials

Ore: Sphalerite
Ore: Chalcopyrite
Ore: Chalcocite
Ore: Malachite
Ore: Gold
Ore: Galena
Ore: Bornite
Gangue: Quartz
Gangue: Pyrrhotite
Gangue: Pyrite

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Comments

Comment (Reserve-Resource): DRILL-INDICATED RESERVES OVER 1,500 FT. STRIKE LENGTH IN AREAS NO. 3 AND 5, WITH AVERAGE WIDTH OF 31.5 FT AND DOWN-DIP THICKNESS OF 1,000 FT..

Comment (Reserve-Resource): INFERRED RESERVES OVER 9,000 FT. STRIKE LENGTH (ASSUMING DEPOSIT IS CONTINUOUS UNDER GLACIER BETWEEN AREAS NO. 3 AND 5), AVERAGE WIDTH OF 3

Comment (Location): USGS B 1525, FIG. 69, SAMPLE NO. 4K235; USGS MF-425, LOC. 6. LOCATION IS IN AREA 5 AT RICHEST SAMPLE LOCATION. AREAS 4, 5 ARE S OF SUMDUM GLACIER, MAY BE CONTINUOUS WITH AREAS 1, 2, 3 TO THE NORTH. LAND STATUS VALUE CALCULATED 6-94 USING GIS OVERLAY ANALYSIS WITH BLM 1:2,500,000 SCALE OWNERSHIP STATUS MAP (1991).

Comment (Development): 62 LODE CLAIMS LOCATED IN 1958-1959. DIAMOND DRILLING AND SAMPLING CONDUCTED IN 1959. NO PRODUCTION.

Comment (Deposit): LA SECRETARIA DE MINERIA DE LA NACION INICIO LAS TAREAS DE PROSPECCION EN EL VALLE DEL CURA EN NOVIEMBRE DE 1980, DESARROLLANDOSE INICIALMENTE TAREAS DE PROSPRCCION REGIONAL EN ESCALA 1:200.000, SOBRE UNA SUPERFICIE DE APROXIMADAMENTE 3500 KM2, DESARROLLANDO TAREAS DE MUESTREO GEOQUIMICO, SEDIMENTOS DE CORRIENTE, ESTUDIOS PETROGRAFICOS, CALCOGRAFICOS Y ALTERACIONES. SOBRE UNAS 700 MUESTRAS GEOQUIMICAS, LOS VALORES DE ORO DETERMINADOS POR ABSORCION ATOMICA VARIARON ENTRE 0.2 Y 22.4 PPM, CON ANOMALIAS DE AG DE MAS DE 500 PPM. DURANTE 1982/83 SE INICIARON TAREAS DE PROSPECCION ESTRATEGICA EN LAS ZONAS JAGUELITO, VELADERO Y LOS AMARILLOS DELIMITANDO AREAS DE ALTERACION INTERESANTES. EN EL ANO 1987 SE REALIZO UN LEVANTAMIENTO TOPOGRAFICO GEOLOGICO ESCALA 1:3000 DE UNA SUPERFICIE DE APROX. 4 KM2, CON MUESTREO DE ESQUIRLAS Y CALICATAS SOBRE 58 MUESTRAS LITOQUIMICAS Y 38 PARA ESTUDIOS PETROGRAFICOS Y DE ALTERACION, LA RESPUESTA FUE QUE TRES MUESTRAS ESTAN POR ENCIMA DE 0.5 PPM DE AU, Y UNA DE

Comment (Workings): 14 DIAMOND DRILL HOLES TOTALLING 5,400 FT., AND 300 FT. OF OPEN CUTS.

Comment (Geology): LARGE ISOCLINAL ANTICLINE HAS SMALLER DRAG FOLDS ON LIMBS; SMALLER FOLDS OVERTURNED TO SW. BOUNDED BY HORNBLENDE SCHIST AND AMPHIBOLITE ON WEST, FOLIATED TONALITE ON EAST.

Comment (Deposit): DRILL DATA INDICATES THAT MINERALIZATION IS PROBABLY CONTINUOUS UNDER SUMDUM GLACIER BETWEEN NORTHERN DEPOSIT (SD-13) AND SOUTHERN DEPOSIT (SD-14). ; INFO.SRC : 1 PUB LIT

Comment (Deposit): PLATA REVELO 414 PPM. CON ESTOS DATOS SE CONCLUYO QUE LA MINERALIZACION AURIFERA DEBERIA UBICARSE A NIVELES MAS PROFUNDOS. EN LA ZONA DE VELADERO SE DETERMINARON ESTRUCTURAS TIPO STOCKWORKS CON GRAN DENSIDAD DE VENILLAS ENTRECRUZADAS RELLENAS DE LIMONITA, YESO, ARCILLA Y MANGANESO. SE HAN RECONOCIDO VETAS DE CUARZO CON ESPESORES DE 0.8 A 3 M Y DE 70 A 200 M DE CORRIDA. EN GENERAL LA MINERALIZACION ESTA EN VETAS, FORMANDO CLAVOS EN LA INTERSECCION DE LAS FALLAS Y FRACTURAS. ; INFO.SRC : 2 UNPUB REPT

Comment (Location): ACCESO POR HUELLA MINERA, AGUA ES ABUNDANTE Y DIFIERE EN SU CALIDAD PARA USO HUMANO POR LA CONTAMINACION QUE PRODUCEN LOS SURGENTES TERMALES, EL CLIMA ES CONTINENTAL SECO DE ALTA MONTANA, CON VIENTOS PREDOMINANTES DEL SECTOR NW-SE INCREMENTANDOSE A COMIENZOS DE LA PRIMAVERA , ABUNDANTES NEVADAS EN INVIERNO. (EL AREA ESTA LIMITADA POR LOS PARELELOS 2910' Y 30 07' Y LOS MERIDIANOS 6930' Y 7000'W)

Comment (Reserve-Resource): LA ZONA MAS EXPLORADA, ZANCARRON, RESERVAS DE 2.000.000 TON CON 4 G/T AU.

Comment (Commodity): ORO NATIVO CON PARTICULAS TAMANO 34 MICRONES

Comment (Production): LA ZONA DE ZANCARRON HA SIDO EXPLOTADA EN FORMA SEMIMECANIZADA CON EL FIN DE REALIZAR ENSAYOS A ESCALA INDUSTRIAL CON RECUPERACION DE AU MEDIATE CIANURACION Y LIXIVIACION EN PILAS.

Comment (Deposit): MINERALIZED ZONES 1-50 FT. WIDE ALONG CREST AND FLANKS OF LARGE NW-STRIKING, GENTLY SE PLUNGING, ISOCLINAL, ANTICLINAL FOLD IN INTERLAYERED BIOTITE-PLAGIOCLASE AND HORNBLENDE-PLAGIOCLASE GNEISS. POTENTIAL ORE BODIES ON MINOR FOLDS ON LARGER FOLD LIMBS, PARALLEL TO AXIS OF LARGE ANTICLINE. SOME ORE ZONES FOLLOW BRECCIATED FAULT ZONES. DISSEMINATED AND LOCALLY MASSIVE PYRRHOTITE AND PYRITE BODIES CONTAINING CHALCOPYRITE AND SPHALERITE WITH SMALL AMOUNTS OF BORNITE, CHALCOCITE, MALACHITE, AZURITE, AND GALENA ARE PARALLEL TO FOLIATION OF GNEISS, STRIKING N 25 DEGREES-50 DEGREES W. QUARTZ IS DOMINANT GANGUE MINERAL, AND FORMS VEINS AND LENSES. MASSIVE SULFIDE BODIES ARE UP TO 50 FT. LONG AND 15 FT. THICK. IF MINERALIZATION BETWEEN AREA 3 NORTH OF SUMDUM GLACIER AND AREAS 4 AND 5 SOUTH OF THE GLACIER IS CONTINUOUS, THE DEPOSIT WOULD HAVE A STRIKE LENGTH OF 10,000 FT., WITH 1,000 FT. OF DOWN-DIP MINERALIZATION EXPOSED.

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References

Reference (Deposit): USGS B 1525, P. 180-85, FIG. 69, TABLE 29 (1984)

Reference (Deposit): USGS B 1108-E (1964)

Reference (Deposit): USGS OF 78-698, P. 28-29 (1978)

Reference (Deposit): USGS MF-425, LOC. 5 (1972)

Reference (Other Database): BAG-B-1525-FIG-69-4K235

Reference (Reserve-Resource): USGS B 1525, P. 185

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