1. Mineral Resources
  2. Online Spatial Data
  3. Mineral Resource Data System (MRDS)

Quilca District

Past Producer in Arequipa, Peru with commodity Mica
Map
XML
JSON
KML
D
Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Commodities
  6. Alteration
  7. Nearby scientific data
  8. Geologic structures
  9. Controls for ore emplacement
  10. Economic information about the deposit and operations
  11. Mining district
  12. Bibliographic references

Geologic information

Identification information

Deposit ID 60001614
MRDS ID W002270
Record type District
Current site name Quilca District

Geographic coordinates

Geographic coordinates: -72.34132, -16.6394 (WGS84)
Relative position NO. 49, 50, 51, 52, 53, 54 ON METALLOGENIC MAP OF PERU, 1969. LOCATION GIVEN ABOVE IS FOR THE NICHO DEPOSIT, NO. 50

Site location context

Political divisions (FIPS codes)

Arequipa(province)

Peru(country)

South America(continent)

Land(continent)

Geographic areas

Country State
Peru Arequipa

Commodities

Commodity Importance
Mica Primary

Alteration

  • (Local) WALL ROCK ALTERATION IS STRONG NEAR THE PEGMATITES BUT DIMINISHES RAPIDLY IN INTENSITY AWAY FROM THEM. ALTERATION IS STRONGEST AT THE FOOTWALL. THE GNEISS APPEARS TO HAVE BEEN RATHER SUSCEPTIBLE TO ALTERATION, WHERE AS THE DIABASE DIKES WERE RESISTANT. ALTERATION PRODUCTS INCLUDE BIOTITE, MUSCOVITE, QUARTZ, AND CALCITE.

Nearby scientific data

(1) -72.34132, -16.6394
ListMap

Economic information

Geologic structures

Type of structure Local
Structure description ENTIRE REGION UNDERLAIN BY REDDISH OR PINK PREDOMINANTLY MASSIVE SYENITIC GNEISS OF POSSIBLE PRECAMBRIAN AGE. IT CONSISTS MAINLY OF PINK POTASH FELDSPAR, WITH MINOR HORNBLENDE, BIOTITE, AND A LITTLE QUARTZ THAT IS THOUGHT TO BE SECONDARY. INCLUDED IN THE GNEISS ARE NUMEROUS STREAKS OR LENSES OF DARKER MATERIAL, POSSIBLE METAMORPHOSED DIKES, AS WELL AS OF HIGHLY FELSIC ROCK MADE UP ALMOST ENTIRELY OF FELDSPAR WITH A LITTLE QUARTZ. CUTTING THE GNEISS ARE DIABASE DIKES OF AT LEAST TWO AGES. PEGMATITES ARE FOUND THROUGHOUT THE REGION BUT SEEM TO BE MORE ABUNDANT IN AREAS WHERE OLDER DIABASE DIKES ALSO ARE ABUNDANT.

Controls for ore emplacement

  • THE PEGMATITES RANGE IN SHAPE FROM EVEN TABULAR BODIES TO PRACTICALLY EQUIDIMENSIONAL MASSES, BUT ARE GENERALLY IRREGULAR LENSES THAT COMMONLY ARE ONLY 25-30 M LONG. THE MOST ABUNDANT MINERALS OF THE PEGMATITES ARE QUARTZ, POTASH FELDSPAR, AND MUSCOVITE, AND THE MOST COMMON ACCESSORY MINERALS ARE TOURMALINE, ILMENITE, BIOTITE, AND GARNET. BERYL IS ASSOCIATED WITH TOURMALINE IN ONE PEGMATITE. GRAPHIC INTERGROWTHS OF QUARTZ AND FELDSPAR ARE FAIRLY COMMON. THE PEGMATITES COMMONLY SHOW A ROUGH MINERAL LAYERING OR ZONING. A CENTRAL CORE OF MASSIVE QUARTZ, WITH OR WITHOUT SCATTERED CRYSTALS OF FELDSPAR OR MUSCOVITE, COMMONLY GRADES OUTWARD INTO A ZONE WITH MORE ABUNDANT FELDSPAR AND MUSCOVITE AND AT THE WALLS TO A FINER-GRAINED ASSEMBLAGE. A FAIRLY WELL DEFINED LAYER OF FINE- TO MEDIUM-GRAINED MICA AND QUARTZ OFTEN MARKS THE FOOTWALL.

Economic information about the deposit and operations

Development status Past Producer
Commodity type Non-metallic
Year of first production 1905

Mining district

District name QUILCA DISTRICT

Reference information

Bibliographic references

  • Deposit

    SIMONS, FRANK, 1960, UNPUBLISHED REPORT, P. 1701

  • Deposit

    PERU-MAPA METALOGENETICO, 1969, AND, GUIA PARA EL MAPA METALOGENETICO DEL PERU, SOCIEDAD NACIONAL DE MINERIA Y PETROLEO, LIMA, PERU, NOV. 1969

  • Deposit

    CAMMINATI, LUIS, 1944, INFORME SOBRE EL RECONOCIMIENTO PRACTICADO A LA ZONA MICACEA DE LOS DEPARTAMENTOS DEL SUR DEL PERU: CUERPO DE ING. DE MINAS DEL PERU BOL., NO. 130, P. 97-118

Beyond USGS

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

Maps centered on this site