Brass  : Brass was used in Lothal and Atranjikhera in the 3rd and 2nd millennium BCE.

             Brass and probably zinc was also found at Taxila in 4th to 3rd century BCE contexts.

Copper:  Copper technology may date back to the 2nd millennium BCE in the Himalaya region.

Copper and its alloys were also used to create copper-bronze images such as Buddhas or Hindu/Mahayana Buddhist deities.[39] Hiuen Tsang also noted that there were copper-bronze Buddha images in Magadha. In Varanasi, each stage of the image manufacturing process is handled by a specialist.

See also, Copper: History and Etymology http://www.vanderkrogt.net/elements/ elem/cu.html

Gold  :  The deepest gold mines of the Ancient world were found in the Maski region in Karnataka.

Silver:   Ancient Silver mines in northwest India

Iron  : 5th Century B.C.

See also, Iron: History and Etymology http://www.vanderkrogt.net/elements/elem/ fe.html

Wootz and steel

Zinc  :    Extracted in India during 4th to 3th century BCE

          - The distillation technique was developed around 1200 CE at Zawar in Rajasthan

          - China exported Zinc to Europe under the name of totamu or tutenag during 17th Century

See also, Lead, Tin, Bronze & Mercury

Lead: History and Etymology http://www.vanderkrogt.net/elements/elem/pb.html

Tin: History and Etymology http://www.vanderkrogt.net/elements/elem/sn.html

See also, Metals Historical Timeline  

Image Source: http://matse1.mse.unuc.edu/ metals/tme.html