在干旱和半干旱地区,由于缺乏常年流水,不易形成人们熟知的大型冲积物及砂金矿;而大量洪积、坡积、洪坡积物的形成则是干旱和半干旱地区的特点。这样的堆积区能否形成有工业价值的大中型砂金矿,是我国北方值得探讨并具有现实意义的课题。经我队几年来的工作,答案是肯定的。现将内蒙某地由坡积与洪积联合作用所造成的洪坡积型砂金矿的富集特征介绍如下。 In arid and semi-arid areas, large-scale alluvial and gold-gold deposits are not easy to form due to the lack of perennial water flow. However, the formation of a large number of alluvial, slope and flood accumulations is characteristic of arid and semi-arid areas. Whether such accumulation area can form large and medium-sized sand-gold deposits with industrial value is a topic worth exploring and having practical significance in the north of our country. My team’s work over the past few years, the answer is yes. The enrichment characteristics of the Hongpo-type placer gold deposit caused by the joint action of slope plot and alluvial plot in a certain place in Inner Mongolia are introduced as follows.