Alluvial gold placers directly related to primary sources: An important forecast criterion

Two extreme groups of alluvial gold placers (lost and preserved “live” relation to the primary sources) are distinguished by the character of this relation and mineralogical-geochemical peculiarities. The content of the invisible gold in the first ones is close to the regional background (first mg/t) in contrast to its anomalous (exceeding the local background for several orders of magnitude) amount in placers of the second type. The invisible gold composes the geochemical dispersion flows combined with the placer. The placers of this type are important forecast criterion of the assessment of the nearby areas for the primary gold.