Residual slope heavy sand method is a simple gold prospecting method with low cost, high speed and good effect. It is based on the mechanical dispersion halo (flow) formed by eluvial gold minerals and heavy sand minerals, and then further search for primary gold deposits. The enrichment of heavy sand in residual slope deposits is mainly influenced by topography, and the heavy sand in residual slope deposits is generally selected at the valley bottom, valley mouth or depression.
The sampling point is arranged in the slope layer of mountain depression, and the residual heavy sand is usually sampled on the uneven bedrock surface. Multi-purpose grid method for sampling residual slope heavy sand. Net density usually used for fruit measurement.
The sampling depth of residual slope sand is generally 20-50 C below the humus layer.
M, the maximum weight of the sample is about 20kg. Wash the sample in the field with a pan until it is gray and heavy sand (the weight of gray sand should not be less than 15g), then put it into a numbered small white cloth bag and dry it. Finally, the lime-sand samples will be registered in a unified way, and the sample submission form will be filled out and sent to the laboratory for identification.
The extended data soil survey method, also known as soil metal quantity measurement method, is to find primary gold deposits by looking for abnormal metal quantity (or secondary halo) in residual slope soil. Soil survey requires that the survey line should be perpendicular to the regional tectonic line, and the sampling interval depends on different scales. So far, there is no uniform standard. Generally, various scales of soil survey grids are used. The sampling objects of soil investigation are soil layer and eluvial layer. It is best to do sampling depth test before construction, and select the depth sampling with the most appropriate effect. If sampling test is not carried out, it is usually necessary to pass through the upper layer (humus layer) and take samples in the middle layer (leaching). The sampling depth is about 2.
0-30 c m, the weight is not less than 200 g g, the processing granularity of field samples is generally below 60 mesh, and the samples should be sieved with nylon. The weight of the treated sample should be greater than 30g, and the sample should be sent to the laboratory for analysis.
The sample sending and analysis items of soil measurement should be determined according to the working area and possible sediment types. But gold and silver are the best indicator elements, which have universal significance. Generally speaking, the gold content in soil exceeds. 0.0 1pp
If the content of M and Ag exceeds 0.7ppm, it is called abnormal area, and it is possible to find gold deposits. In addition, according to the prospecting experience in many areas at home and abroad, besides gold and silver, the best indicator elements are mainly arsenic, antimony, bismuth, copper, lead and zirconium. , and co.