The metasediments of Arkari Formation at Garam Chashma host the tungsten mineralisation in Chitral, Northern Pakistan, within the Hindu Kush terrane. These metasediments are composed of garnet mica schist, phyllite, marble psammite, calc-silicate rocks, quartzites and tourmalinites. The analysed rocks are intruded by leucogranites emplaced after the culmination of amphibolite facies metamorphism. These leucogranites are exposed 400 m away from the scheelite mineralisation. The trace elements data of the background metasediments at Garam Chashma and surrounding areas indicate that these rocks have undergone a hydrothermal alteration. The higher levels of F, Li, Cs, and to a lesser extent Be, W, Pb, Th, Zr, Y, Hf and Nb are compatible to the metasomatic activity in the area. The source of the hydrothermal fluids appears to be related to the near by exposed leucogranite.