Fig. 1 shows the basic technological scheme of sample processing. As can be seen, the technology provides, first of all, crushing and crushing of the core. Crushing is carried out in a standard SHCHD-10 jaw crusher, which is well-established in Russia. The -2 mm coarse material obtained by crushing in a closed cycle with a screen is completely crushed in the MPP-2-1 planetary mill. The entire product obtained after grinding in a planetary mill is sent for air classification to a specially developed pneumatic classifier.

As is known, in the samples of some deposits, especially its upper horizons, there is a high content (up to 90%) of the clay fraction. If the crushing and wet grinding processes are more or less favorable, then the subsequent classification on the vibrating screen becomes a stumbling block and significantly reduces productivity. The same is observed when screening a dry clay product. An attempt to increase or decrease the amplitude, speed of vibration, etc. does not give the desired results.

However, if a significant part of the micron-sized material is removed before screening, screening is extremely favorable, with high productivity and high quality (efficiency) of screening. The aerial classifier is used to identify subtle classes. Its capabilities make it possible to isolate a product of less than 10 (12) microns, which immediately enters a standard paper bag, the so-called filter collector. A fan is used to disperse the material in the air classifier, as well as to collect all other products when cleaning the mill.

The product of the air classification with a grain size of +10 (+12) microns is sent to a standard vibrating screen. Screening on a vibrating screen allows you to select a class of +100 or +74 microns in the required amount, more often it is 70-100 g, which is sent for assay analysis. The size class -100 (-74 microns) is also collected in the filter collector. The product collected in this way is sent for quartering in a Jones divider, where a sample of 70-100 g is taken for assay. This completes the processing cycle.

Sometimes, for the most durable ores, the technology uses an additional MPP-1-2 planetary mill with two drums for grinding small (up to 200 g) volumes.