The Dios Padre Mine lies in the Sierra Madre Occidental, in a Cretaceous Volcanic Suite which is regionally grouped as the ‘Lower Volcanic Sequence’.  These rocks are overlain (and completely covered to the East by a Tertiary sequence of  Rhyolite tuffs and basalts regionally grouped as the Upper Volcanic Sequence.  The interface between these sequences, and in particular the upper parts of the Lower Volanic Sequence, is the host environment for significant Gold and Silver districts including the nearby Sahuaripa, Mulatos, Dolores and Ocampo Districts and further south the El Sauzal Discovery.  The setting of these deposits varies but they all occur within this highly prospective interval.

Mill site from above pit. Note Ore stockpile

The Dios Padre property is underlain by Cretaceous Dacite and andesite, locally intruded by the mineralized Dios Padre Porphyry (a brecciated rhyodacitic dacitic porphyry which may be partly intrusive or subvolcanic) and coeval barren dikes of similar composition.

The Dios Padre Porphyry hosts the known high grade silver mineralization within the property.  It  has been strongly modified by two phases of brecciation and moderate to intense argillic alteration, locally strong sericitic alteration, and infilling of leached voids by silica, barite and calcite.   Silver occurs with pyrite, galena, tetrahedrite, Freibergite, sphalerite, traces of pyrargyrite and native silver.   Traces of chalcopyrite are also present.  Gold values range from local highs of 1+ ppm in the uppermost part of the zone to less than 100 ppb in the lower portions.  Copper appears to increase with depth.