Investigator

S. Farooq  
Department of Geology
Aligarh Muslim University
 

email farooq.amu@gmail.com

Basemetal Resource Information System for Pithoragarh District, (Kumaon) Himalaya A Remote Sensing & GIS Approach

Basemetal Deposits in Pithoragarh:

Significant basemetal mineralization is known from 15 localities in Pithoragarh district.  Mineralization mainly occurs in the form of epigenetic sulfide emplacement through hydrothermal solutions, and appears to be controlled by lithology and structure of the host rocks.  Most deposits occur as disseminations and fracture fillings in rocks of the Pithoragarh Formation.  Only a few occurrences, and perhaps the most important ones, are found in the crystalline rocks.  This map depicts the spatial relationships of known mineral occurrences and their relationships with faults, thrusts and other lineaments.

Location map of Basemetal Deposits in Pithoragarh District, Kumaon Himalayas.

This is an interactive digital map in Scalable Vector Graphic (SVG) format.  For more information on navigating, click here.

Sulfide mineralization in Bora Agar and Rain Agar is associated with quartz veins in bands of talcose dolomite and phyllite. Around Bora Agar such talcose bands extend for about 300 m with a thickness of 20 m. Talcose dolomites with sulfide occurrences also occur in Dewalthal.  Westerly continuation of the talcose bands of Rain Agar-Bora Agar is found in the neighbouring district of Bageshwar.  Talc band are reported from Gairar, Masauli and Dayali in Bageshwar (Kothiyal et al, 2002). 

Polymetallic basemetal sulfide mineralization is also reported in association with barite deposits from at least three localities in the Tethys sediments north of and close to the Vaikrita Thrust by Sinha (1977):

1.  Barmatiya: Situated 70 km east of Badrinath (16 km from Malari in the Girthiganga valley) in Chamoli District.  The mineralized zone is developed along the northern wall of the strike slip fault which juxtaposes the Ralam conglomerate and quartzites with the younger dolomitic limestones and slate of the Garbyang Series.  The fault plays a significant role in channeling mineralizing fluids which are confined only to the northern wall.  Barite occurs in thick veins cutting across the dolomitic limestone, phyllite and siltstone of the Garbyang Series as well as in a concordant relationship with these.  The thickness of veins ranges from a few cm to more than a metre.  They sometimes persist for as much as 20 m.  The sulfide minerals are concentrated along the intersections of joints, reiterating a structural control of mineralization.  A large number of old workings are strewn on either side of the deep gorge for a length of about 8 km.  The identified sulfide minerals are: Chalcopyrite, chalcocite, covellite, bornite, cuprite, malachite, azurite, pyrite, pyrrhotite, galena, sphalerite and stibnite.  The chief gangue minerals are calcite and quartz.  Copper concentration varies from 2 to 3410 ppm.

2.  Milam:  Situated 37 km southeast of Malari and 2 km upstream from Milam village in the Gonkha Gad valley.  Mineralization is associated with quartz veins in Martoli phyllite at the contact of Ralam Conglomerate.  Identified sulfide minerals include chalcopyrite, bornite, malachite, pyrite and pyrrhotite among with some native copper.  The content of copper has been found to be as much as 1.62 %.

3.  Go: Situated 40 km southeast of Milam and 2 km upstream from the village Go on the left bank of the gorge of the Darmaganga River.  Mineralization occurs along the tectonic contact between Ralam Quartzites and Garbyang Series.  Copious amounts of barite occur with polymetallic sulfides.  The mineralized zone attains a width of 50 m and cuts across the host rocks in a NW-SE direction.

The geological setup of these three occurrences is the same - they are confined to sedimentary host rocks, are associated with wallrock alteration in the form of sericitization and dolomitization, and are therefore considered to be of hydrothermal origin.  Sinha (1977) estimates the temperature of formation of these deposits to range between 50-200o C.

Geology

Structure

Mineralization

Wallrock Alteration

Lineaments

   


This website is hosted by

S. Farooq

Department of Geology

Aligarh Muslim University, Aligarh - 202 002 (India)

Phone: 91-571-2721150

email: farooq.amu@gmail.com