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| To this end, a systematic selection schlich samples mainly from the upper part of the alluvium is also carried out control testing of its deep horizons, unsealed pits or clearing. Depending on the composition of the rocks bedrock river valley and the degree of tectonic recycling, surface raft dramatically different. With massive homogeneous bedrock raft has a fairly flat terrain and heavy minerals are distributed evenly priplotikovyh horizons of alluvium. The initial volume (or mass) schlich sample depends on the content of clastic heavy minerals, which thus determine the representativeness of samples obtained during washing of the concentrate. Schlich initial volume of the sample should be such that after washing with a minimum yield of concentrate was 10-15 g; concentrates smaller mass unrepresentative and can not ensure the accuracy of exploration. The initial volume or weight of all selected schlich samples should be standard, which allows to obtain comparable results throughout the Territory for the quantitative content of the concentrate - forming minerals in the loose rocks. You can also determine the average weight of the washing tray filled with loose rock, through its weighting, and then consider the number of washed trays in one sample, counting out concentrate on its original mass. Consider a sampling of river systems in the final phases of the erosion cycle. River systems in the completed development cycle typical of medium-, low-mountain and lowland areas. By damping tectonic movements, erosion and denudation are giving way to a process of accumulation. The relief of these areas flattened, slightly disjointed, with calm forms. |