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Pacococha, Huarochiri Province, Lima Department, Peru

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Latitude & Longitude (WGS84): 11° 51' 18'' South , 76° 14' 31'' West
Latitude & Longitude (decimal): -11.85500,-76.24194
GeoHash:G#: 6mcu91f79
Köppen climate type:ET : Tundra

The Pacococha District is located four kilometers SW of Millotingo, on the banks of Pacococha lake, nearly due southwest of Casapalca about 20 km, and about 35 km SW of Yauli. Elevations range between 4,600 - 5,000 meters, and the district measures about 4 km by 6 km. Pacococha is situated among the mining districts of Viso-Aruri, Millotingo, Pucacorral, and Chanape (Fig. 18). Millotingo is considered as part of the Pacococha district by Ly and Arce (1965). Petersen (1962) and Ly and Arce (1965) briefly describe the district, and much of the data is abstracted from their reports.

Scattered workings suggest some mining was going on during the Colonial period in the country. Modern development began in 1950 with the building of a 27 km road from the Central Highway to the district. As of the mid-1970's, approximately 42,000 meters of drifts had been completed from 24 veins in the various mines.

The predominant rock types are Cenozoic andesitic volcanic flows with a composite thickness of 700-1000 meters. These flows are interlayered with tuffs and rhyolites. The volcanic rocks have been intruded by several fine-grained diabase or diorite porphyry stocks, which have pyritized, silicified, kaolinized, and otherwise altered the proximal volcanics surrounding them.

Mineralization is by fracture filling, with the larger veins having lengths of 500 to 1000 meters and thicknesses of 1 to 1.5 meters. Outcrops of these veins are composed of quartz with box-works from weathered-out sulfides. Veins are discontinuous and new reserves must be continuously sought.

Vein mineralization is dominantly chalcopyrite, galena, dark sphalerite, and quartz, with lesser pyrite. Tetrahedrite, silver sulfosalts, argentite, marcasite, fluorite, barite, calcite, and rhodochrosite are minor constituents. Pyrite is usually present as stringers in the veins and disseminated in the wall of the veins as small cubes. High grade veins have almost no quartz. Quartz is usually found in the sub-economic portions of the veins or as the veins narrow and pinch-out.

Some veins are located in the upper parts of the diabase stocks and have a more complex mineralogy than do the veins in the tuffs and andesites. Typical minerals in these stocks are pyrite, sphalerite, chalcopyrite, arsenopyrite, galena, bornite, pyrargyrite, tetrahedrite, trace gold, calcite, and quartz.

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Standard Detailed Strunz Dana Chemical Elements

Mineral List

Mineral list contains entries from the region specified including sub-localities

8 valid minerals.

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Group 4 - Oxides and Hydroxides
Group 9 - Silicates

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmXp, with m:p = 1:1
AmBnXp, with (m+n):p = 1:1
AmBnXp, with (m+n):p = 1:2
ø > 4
ø = 3
Group 65 - INOSILICATES Single-Width,Unbranched Chains,(W=1)
Single-Width Unbranched Chains, W=1 with chains P=5
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si

List of minerals for each chemical element

O QuartzSiO2
O RhodoniteMn2+SiO3
Si QuartzSiO2
Si RhodoniteMn2+SiO3
S ChalcopyriteCuFeS2
S Polybasite[(Ag,Cu)6(Sb,As)2S7][Ag9CuS4]
S PyrargyriteAg3SbS3
S PyriteFeS2
S PyrrhotiteFe7S8
S SphaleriteZnS
Mn RhodoniteMn2+SiO3
Fe ChalcopyriteCuFeS2
Fe PyriteFeS2
Fe PyrrhotiteFe7S8
Cu ChalcopyriteCuFeS2
Cu Polybasite[(Ag,Cu)6(Sb,As)2S7][Ag9CuS4]
Zn SphaleriteZnS
As Polybasite[(Ag,Cu)6(Sb,As)2S7][Ag9CuS4]
Ag Polybasite[(Ag,Cu)6(Sb,As)2S7][Ag9CuS4]
Ag PyrargyriteAg3SbS3
Sb Polybasite[(Ag,Cu)6(Sb,As)2S7][Ag9CuS4]
Sb PyrargyriteAg3SbS3

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on

23.03 - 66 Ma

ID: 3191170
Cenozoic sedimentary rocks

Age: Paleogene (23.03 - 66 Ma)

Lithology: Sedimentary rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Data and map coding provided by, used under Creative Commons Attribution 4.0 License


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Mineralogical Record (1997): 28 (July-August).

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