El departamento de Guachipas, Salta (Noroeste Argentino) se caracteriza por la concentración de sitios arqueológicos, algunos de ellos se destacan por sus representaciones rupestres. En esta presentación se describe el sitio Río Pirgua 1 y se comparan sus representaciones con las de otros sitios de la microrregión Las Juntas. El conjunto analizado se compone de 96 motivos pintados que incluyen escutiformes (característicos del área de estudio), figuras humanas y camélidos en diferentes actitudes. Los mismos serían producto de tres momentos de ejecución. El más reciente posiblemente coincidente con la presencia inca en la región (1450-1535 d.C.), otro momento atribuido al período Desarrollos Regionales (900-1450 d.C.) y uno más temprano correspondiente al primer milenio de la era cristiana (0-900 d.C.). Se discuten las razones de esta adscripción.

Abstract. Recent concerns regarding the rock pile stability of a mine in northern New Mexico have lead to the instigation of a multi-disciplinary research program to investigate the pile characteristics and behavior. Geophysical techniques and 7 trenches were used to assess the internal structure of the material for the Goathill North rock pile. Electromagnetic (EM) induction and ground penetrating radar (GPR) methods were used to measure the spatial variability in electrical conductivity and to image the internal structures of the rock pile, respectively. Seven trenches were excavated for analysis of the stratigraphy.The measurements show the characteristics of the top 5 to 8 meters of the rock pile. The electrical conductivities varied typically around 6 mS/m, but on the southwestern part of the rock pile anomalously high values up to 30 mS/m were found. These high values can be explained by a different texture, mineralogy or pore-water composition, or a higher water content. In this area the penetration depth of the GPR waves is significantly reduced and the reflection configuration is dominated by sub-horizontal reflections. In general, the GPR results have a character of reflectors whose dip directions and angles (maximum 30 degrees) reflect the rock-pile deposition. The trench data show excellent overlap with the GPR survey.

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