1. Qinhuangdao Mineral ��esource and Hydrogeology Brigade��Hebei Geological Prospecting Bureau�� Qinhuangdao 066001��Hebei��China; 2. College of Earth Sciences��Jilin University��Changchun 130061��China

Laterite nickel ore is produced by basic and ultrabasic rocks after weathering- leaching- deposition and enrichment in tropical and subtropical areas with high temperatures and rainy weather throughout the year�� Bas- ic and ultrabasic rocks are considered to be mineraliing mother rocks for rocks of this type�� Therefore��looking for basic and ultrabasic rocks is the primary task to explore for laterite nickel ore in the past time�� A new type of later- ite nickel ore was discovered recently in Kolaka County of Sulawesi province��Indonesia�� The ore- forming mother rocks are not basic or ultrabasic rocks��but a set of conglomerates consisting of dominated ultrabasic gravel�� Gravel lateritic nickel deposit was named to distinguish from traditional laterite nickel ore resulted from basic and ultrabasic rocks after weathering and leaching�� The structure of the deposit can be divided��in descending order��into humus layer��laterite layer��strongly weathered conglomerate layer��semi- weathered conglomerates��and conglomerates�� The nickel ore body is mainly distributed in the semi- weathered conglomerate layer�� It is preliminarily considered that the ore deposit was made from conglomerate after weathering- hydrolysis- leaching- sedimentary and enrichment��