Physical and chemical properties of ore-forming minerals

Physical and chemical properties of ore-forming minerals

A characteristic feature of the structure of pyrite ore deposits is the zonal distribution of their various types, established by a number of researchers. At the same time, a number of general patterns have been identified, of which the main ones are that most ore bodies are characterized by the same type of contrasting zonation in terms of power with regular enrichment of copper and zinc from the supine side to the hanging side. Since the pyrite deposits agree with the stratification of the host rocks, the zoning vector, as emphasized by V. I. Smirnov and D. V. Rundqvist, is perpendicular to the stratification. At the same time, the indicated orientation of the zoning vector remains constant in both flat-lying and steeply falling deposits that have changed their primary occurrence.

The physical and chemical properties of ore-forming minerals are identical in the corresponding elements of different rhythms within the same deposit, while there are significant differences between the minerals of the same name involved in the structure of different elements of the same rhythm. Using the example of the Gaysky deposit, it was found that pyrite from the pyrite parts of all rhythms, represented by fine-grained aggregates with ubiquitous relics of metacolloidal and framboidal structures, marcasite and melnikovite, has an increased content of arsenic and manganese and similar physical properties. It is constantly associated with a small amount of chalcopyrite, the ratios with which are characterized by the absence of corrosive boundaries. Pyrite, which is involved in the chalcopyrite-pyrite elements of rhythms, is depleted in arsenic, enriched in silver and especially copper, and differs from the first in physical properties.

The processing of the results of testing the ores composing the deposits, even more clearly than the mineralogical data, confirms their rhythmic structure with a general enrichment of copper and zinc when moving from the supine side to the hanging side and from the central parts adjacent to the ore supply channel to the flanks of the deposits, which is especially considered in detail on the example of the Ural deposits by A. I. Krivtsov and V. By B. Shishakov. They found that in power sections, both copper and zinc are characterized by a rhythmically striped distribution of concentrations with a general increase in their level from the supine side to the hanging side. The maxima of zinc concentrations are shifted from the maxima of copper towards the hanging side, with equal areas of elevated concentrations of both metals. The distribution of copper and zinc in directions parallel to the roof of the ore body and corresponding to the elementary components of the latter is symmetrical relative to the supply channel. In the strike and cross sections, the copper and zinc contents are distributed symmetrically relative to the axes of the largest capacities corresponding to the ore supply channels. With a gradual increase in concentrations from the channel, followed by a sharp drop, and the equality of the number of maxima of copper and zinc contents, they are located at different distances from the outlet pathways: less for copper and more for zinc.

Pyrite deposits formed at different stages of the long-term development of the ore process and located at different levels of the section of the ore-bearing strata are in many ways similar to each other. Their rhythmically striped structure is due to the alternation of rhythms composed by the same mineral associations. The physical and chemical properties of minerals forming associations of the same name in different ore bodies are the same, reflecting similar conditions of ore deposition at different stages of the ore process.

Along with this, there is a regular change in the amount of chalcopyrite and sphalerite in the ores of each subsequent substage and stage.

This situation, which is probably partly related to the natural evolution of ore-forming solutions, and partly to the extraction of zinc and copper from previously formed ore bodies washed by solutions of late stages of mineral formation, causes in some cases a clearly manifested vertical zonation of ore fields. It lies in the fact that deposits located at 4 different levels of the productive section, in most cases differ in the content of useful components. The general pattern is expressed in the relative enrichment of chalcopyrite and pyrite (respectively copper and zinc) ores from deposits of higher portions of solutions with ore deposition products of previous rhythms (removal of copper and zinc, combination of ore deposition products of different rhythms, recrystallization of pyrite, etc.); 5 — the direction of migration of ore—forming solutions; 6 - the boundaries of ore types of early rhythms above the ore supply channel. 1xBet is one of the top betting platforms renowned for its vast betting options and caters to both sports and casino. The official 1xbet promo code pakistan for registration form and claim exclusive bonuses for casino and sports betting. Players in Pakistan can use this code when opening your account to get a bonus of up to 36,000 PKR or $/€130. Used when registering a new account at 1xBet.com to get the biggest available welcome bonus today.