[en] The Mahadek Basin of Meghalaya is well known for sandstone type uranium mineralization hosted by Upper Cretaceous Lower Mahadek Sandstone. The Mahadek Basin is elongated in east-west direction and covers an area of 1800 sq km. It is 180 km long from Jayantia in the east and Balphakram in the west and 5 to 20 km wide. Over five decade of extensive exploration effort in the basin, AMD has established more than 20000 te of uranium oxide from this belt which contribute about 11% of total Indian reserves. So far two major deposit, Domiasiat and Wahkyn-Wahkut and five satellite deposit at Umthongkut, Gomaghat, Tyrnai, Lostoin and Phallangdilon have been identified in this basin. The average grade of uranium mineralization is around 0.10% eU₃O₈