Viszla Silver and First Majestic Silver presented drilling results during the week from properties in Mexico. The two are very good examples of how good low sulfidation epithermal systems in Mexico can be, with good to bonanza grades over mineable widths in structures that can run for kilometers along strike and a few hundred meters downdip.

The following is an excerpt of geology and mineralization at San Dimas (also know as Tayoltita) as is on First Majestic’s website: “Locally, precious metal ore is contained in over 120 epithermal veins characterized by low sulphidation and adularia-sericitic alteration, and formed prior to deposition of the UVG. Veins pinch and swell and commonly exhibit bifurcation, horse-tailing, and cymoidal structures. Vein widths vary from less than one centimetre to over 15 metres, but average approximately 2 metres. Veins have been followed underground from a few metres in strike-length to more than 2 kilometres….. Mineralization is typical of epithermal vein structures with banded and drussy textures. Three major stages of veining have been recognized in the district, each containing variable amounts of mineralization. The second stage produced the majority of the ore deposits, which itself included three sub-stages characterized by distinct mineral assemblages, quartz-chlorite-adularia, quartz-rhodonite and quartz-calcite. Sulphide minerals include pyrite, sphalerite, chalcopyrite and galena as well as lesser amounts of argentite, polybasite, stromeyerite, native silver and electrum.”

Here a picture from a vein on the 2021 San Dimas Technical report: