Some questions about sampling point placement
The correct placement of the sampling points is the key to ensuring the representativeness of the ore samples. The sampling designer should comprehensively study the geological conditions of the deposit, according to the complexity of the ore nature, the spatial distribution of ore of different ore types and industrial grades, and the representativeness, number and granularity of the ore samples in mining and ore dressing tests. The specific requirements of the weight, and considering the sampling and construction conditions, etc., determine the number and location of the sampling points reasonably. Generally note the following:
1. The mining points should be distributed in various parts of the ore body and should not be too concentrated. Sampling points should be arranged at the two ends and the middle of the ore body, as well as in the shallow and deep directions along the inclined direction. At the same time, the main reserves should be taken care of, and the sampling points should be taken without affecting the representativeness of the ore samples. Arrangement can also focus on the mining area in the early stage of the deposit.
2. When selecting sampling points, it should consider the different ore types and industrial grades, and take into account the general characteristics of the material composition and ore properties of various types and industrial grade ores, and should also be based on the distribution of associated components. Features, taking care of the associated component content and mineral type.
3. The number of sampling points should be as much as possible. For deposits with complex grade changes, it is sometimes necessary to consider the number of spare sampling points.
4. The existing exploration engineering and mining engineering should be fully utilized, and the most complete engineering point for the ore type and industrial grade should be selected as the sampling engineering point. The surface sampling points should be placed in the exploration works such as natural outcrops and wells or shallow wells with well-preserved or restored workload. The deep sampling points should be placed in the exploration borehole with the core of the mine (rock) as much as possible. When the ore quality changes greatly, the sampling points in the existing projects are limited, and it is difficult to ensure the representativeness of the samples, or the tunnels are not constructed during the exploration stage. It is necessary to adopt a large number of extended continuous tests, semi-industrial tests and industries. When testing ore samples, special sampling points should be arranged in conjunction with prospecting or mining.
5. The surrounding rock sampling points of the top and bottom of the ore body should be placed within the range of the contact with the ore body and the thickness of the surrounding rock during mining.
6. When selecting sampling points, construction and transportation conditions should be considered. Under the premise of not affecting the representativeness of the ore sample, select the location with good construction and transportation conditions as the sampling point.
7. The remaining borehole cores and cores of the test samples during geological exploration are valuable geological exploration effects and should be fully and effectively utilized. However, in the calculation and sampling of the samples, it is not allowed to take all the saved cores and core samples, and only half of them can be taken as test samples. The remaining half should be properly preserved and kept for geological exploration, mineral processing tests, and mine samples for mine production.
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