In other instances, the silver-bearing minerals are intergrown on a sub-micron scale. In some samples the Ag minerals are at the grain boundaries of other minerals. The silver-bearing minerals are extremely fine-grained, and are commonly semi-encapsulated in quartz or calcite. Márquez-Zavalía et al., 2008, report Se content from 2.03 to 8.42% from Se-bearing polybasite-Tac from the Martha mine, Macizo del Deseado, Santa Cruz, Argentina.ĭescription of the Pipilita-Selenian Polybasite minerals at Guanajuato:įor the most part Guanajuato´s ore minerals are microscopic. Harris et al., (1965) considered that mineral as a seleniferous variety of the pearceite-polybasite series.įigure 2.- Regional Geological map of Guanajuato Mining District. This mineral still is an important component of the ore that is mined today.Įarley (1950) reported a “brittle metallic mineral” associated with aguilarite from Guanajuato. The silver sulphosalt aguilarite (Ag4SeS) was first identified in the ores of the Guanajuato Mining District (Genth, 1891, 1892). However, the most significant contributions to the knowledge of the geological mapping and the paragenesis of Guanajuato ores have been made in recent years Figure 2. The name Pipilita is from El Pípila, a hero of Mexican Indepencence.Īt the turn of the XIX th century began the mineralogical study of the silver vein ores of the famous Guanajuato District, (Genth, 1891, 1892) Figure 1. The temperatures of fluid inclusions associated with the Selenian Polybasite minerals have a range from 230.6 to 253.4 ☌. With a decrease of 0.86-1.3 % of Se in Selenian Polybasite every 10 meters of depth, at San Nicolas and Bolañitos mines. The Selenian content of Pipilita (Selenian Polybasite) ranges from 0.17 to 12.69 %. Pipilita (Selenian Polybasite) a new mineral from the Guanajuato Silver-Gold Mining District,MéxicoĪ study of Ag-Au ores from the Guanajuato Mining District (México) has led to the discovery of a new mineral, a variation of Polybasite, which occurs associated with other silver-Selenian bearing minerals.
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