Abstract
As a result of microscopic researches it has been determined that mineralogical composition of the ore field consists of hypogenic,vein and hypergen minerals. A number of factors in formation of ore texture types and structure, including morphological properties of ore minerals, characters of ore solutions, affect of tectonic processes after ore formation are not excluded. Due to the influence of the above mentioned factors stratum, massive, nested textures replace each other in sequence in Gosha ore field. Stratum texture consists of fine, medium and big grain pyrite, quartz, carbonate sequence. Mass texture consists mainly of hardenied pyrite which gradually passes into the granular ore. Nested texture is formed in initval stage of ore formation as a result of pyrite cry stallation and is commonly found in non-ore area. Breccia - like texture is usually found on the edges of ore. Such a texture type mainly consists of pyrite and it is formed by the incorporation of ore solutions into derivative quartz. In the article, along with the texture properties of ore, its structure has already been studied. The structures found in the ore of the field are as follows: rhythmic zoning, porphyry-shaped, residual, cataclysmic. Ore formation process in Gosha field begins from quartz-pyrite. Then it proceeded with quatrz-gold-telluride, quartz-semisulfide, quatrz-carbonate and quartz-goldhelite-hydrochetite stages. This, mineralogical composition, texture-structure properties, mineral formation sequence of Gosha¬pyrite field ore give reason to say that it did not undergo post-metamorphism after the ore formation, and that the field was formed at a low depth, where metacolloid processes were widespread. Keywords: mineralformation, texture, structure, metacolloid, pyrite.
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