Abstract
Copper deposits in Khetri copper belt are hosted in the proterozoic sequence of rocks belonging to Ajabgarh group of Delhi supergroup situated in foot hill zone of Aravalli mountain range North-West, India. Khetri copper belt is about 100 km long NE-SW trending metallogenic province, starting from Singhana in the north to Sangarava in the south. The study area is the northern Khetri copper belt 190 km SW of Delhi, the capital city of India. In the present work an attempt has been made to determine the mode of occurrence and nature of mineralization with special emphasis on mineragraphic study of copper ores. The ore bodies are found in the form of multiple lodes regionally but locally in the forms of veins, stringers, dissemination, sporadic, cavity filling and replacement. Enriched mineralized zones are localized along the contact of Alwar and Ajabgarh group. Copper, the main entity in the belt occurs dominantly as sulphides, oxides, carbonates and sulphosalts mineral hosted in pelitic and psammitic rocks. Pyrrhotite, pyrite, magnetite and sphalerite are the other ore mineral associated with the copper ore in a considerable amount. From the textural, structural and multigenerational minerals, mineral assemblage studies, it is assumed that deposit has undergone metamorphism and multi-stage mineralization. Replacement has a profound influence on mineralization in the northern Khetri copper deposits.
Highlights
Copper deposits in Khetri copper belt are hosted in the proterozoic sequence of rocks belonging to Ajabgarh group of Delhi supergroup situated in foot hill zone of Aravalli mountain range North-West, India
Khetri copper belt is a 100 km long NE-SW trending located in North Delhi Fold Belt (NDFB) of Aravalli Mountains
Mineralization in the khetri copper deposits occurs as multiple lodes of varying shapes and dimensions are localized in medium grade metamorphosed pelitic and psamitic rock units [2] and [7]
Summary
It occurs in native form but mostly in association with sulphur, oxygen, carbonates and other transition metals as sulphosalts. Khetri copper belt is a 100 km long NE-SW trending located in NDFB of Aravalli Mountains. The important localities in the northern part of the area are Madhan-Kudhan (Khetri) (28 ̊4'15": 75 ̊47'25"), Kolihan (28 ̊: 75 ̊44'), Chandamari (27 ̊56': 75 ̊46') and many other described by [1]. At present Kholian and Madhan-kudhan (Khetri Mine) are the only two underground productive mines in the study area. The principal sulfide ore minerals in the northern Khetri copper deposits are chalcopyrite, pyrrhotite, and pyrite [2]-[9] and [10]. In the present work an attempt has been made to lay emphasis on the mode of occurrence and mineralogy of Mudan-Kudan (Khetri), Kolihan and Chandmari copper deposits
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