The crystal forms and thermoelectricity of pyrite from the Shuangwang gold deposit, Shaanxi Province and their applications to metallogenic prognosis

Abstract：Pyrite is one of the most important gold-bearing minerals, and its crystal forms and thermoelectricity have important implications to the prospecting and evaluation of gold deposits. Based on systematic sampling from drill holes ZK18, ZK30 and ZK40 in the Shuangwang breccias-type gold deposit, the authors mainly studied the crystal forms and thermoelectricity of pyrite, and have reached the following conclusions. The crystal forms of pyrite are fairly simple, comprising cube, octahedron, pentagonal dodecahedron and their composite combination, with the main crystal habit being {hk0}. Overall, the number of crystal forms is in decreasing order of {hk0}, {100}, {111}. The thermoelectric conductive type of pyrite is mainly N-P type, with the thermoelectric coefficients of N-type pyrite ranging from -322.0 to-1.7μV·℃-1 and those of P-type pyrite ranging from 1.7 to 346.7μV·℃-1; the thermoelectric parameters of pyrite vary greatly; the degree of denudation varies from 53.67% to 60.12%. All of the above data indicate a better exploration prospect at the depth of drill holes ZK18, ZK30 and ZK40 in No. 9 and No. 8 ore bodies.