Alluvial placers prospecting on plains of the North using reconstruction of the «edoma» surface

Abstract

Many buried placers at the plain are proved to coincide with recent streams. The phenomenon cannot be explained by «inheritance» of .bedrock topography as the explanation contradicts to drilling data. The author suggests that the loess-ice complex (so called «edoma» complex) closely repeat the valley pattern of intermediate topography (existed before the edema complex formation) or primordial valleys dissecting rock basement. The primary placers were formed in these valleys, later .on they were re-deposited and projected on present-day s o l e of the plain, irrelatively to its erosional sculpture.