PRELIMINARY INVESTIGATION FOR
THE SEARCH OF GOLD IN BERWAR FORMATION,
The study area lies 84 km SW of Lalitpur district in Survey of India toposheet no. 54L/15. The rocks of Berwar Formation belong to Mahakoshal (Bijawar) Group, are intensely deformed, sheared, and metamorphosed. The basal member of this formation is comprised of QPC and quartzite containing fuchsite and tourmaline. Quartzite-carbonate-shale shows the presence of strong hydrothermal alteration. The hydrothermal alteration zone and basal conglomerates in the Berwar Formation are zone of interest for Gold mineralisation. The parallel lenses of tourmaline and fuchsite quartzite characterize these zones with sporadic occurrence of pyrophyllite-sericite showing parallel swelling boudinage. Gold associated with tourmaline follow relict bedding. The fuchsite itself forms the cross cutting stringers almost invariably associated with brick red limonitic stains of gossan.
Placer gold has also been encountered in quartz pebble conglomerates of Berwar Formation. Placers ore bodies were developed during the deposition of sediments in braded river environment of Bandai-Dhasan drainage system around the margin of Sonrai Basin. Heavy detrital particles of gold and gold associated sulfides were concentrated.
QUARTZ PEBBLE CONGLOMERATE
(GOLD BEARING ROCK)
* The mentioned host rock viz. Granite-gneisses, quartz pebble conglomerate, ferrugeneous quartzite
and banded iron formation show encouraging average values of gold 1.0 g/t.
* Gold grains associated with sulfides are visible in pan concentrates, in which gold value ranges upto
* Gold value ranges from 0.2 to 0.5 g/t in surface samples of fuchsite quartzite
* In electronic products and equipments such as computers, TVs, Cellphones etc.,
* In jewellary and decoration of ornaments,
* In industrial and medical lasers to focus light,
* In restorative dentistry and eye surgery,
* White gold (alloy of Au with platinum, palladium, nickel, and/or zinc) as substitute for platinum,
* Gold threads in embroidary,
* Green gold (a gold/silver alloy) in specialized jewclary,
* Gold chlorides for making gold compounds,
* Gold isotope (Au-198) in cancer treatment,
* In treatment of rheumatoid arthritis,
* Colloidal gold in medical and biological applications,
* In photography for toning silver images.