Since 2015 the site of Mudhmar East (Adam, Ad-Dakhiliyah Governorate) has emerged as one of the major ritual complexes of the Early Iron Age (900-300 BCE) in Eastern Arabia. This paper presents the results of the latest excavations in 2019. Two areas were investigated. The excavation of Mudhmar East 3 on the jabal slope was completed and this area revealed three monumental walls associated with a complex stratigraphy. Numerous metal artifacts (weapons and snake figurines); and pottery, were recovered in secondary position. The campaign also focused on the grave sitting on the top of the hill, an area distinguished as Mudhmar East 6. This grave, which was badly preserved and had likely been reused, delivered little archaeological material. The 2019 excavation enabled a more thorough investigation of these two essential areas, greatly improving our understanding of this major Iron Age site in the history of Oman.