The interior of Blombos Cave comprises a single main chamber, and the entire (accessible) interior cave floor is about 39m² behind the drip line.West of the cave's main chamber, anthropogenic deposit extends inwardly 3-5 meter.The Blombos Cave project has since then developed academically, economically and administratively; from being a local and small-scale test excavation to becoming an international, full scale, high-technological archaeological project.In 2010–2015 the cave site is the focus of the multi-disciplinary, pan-continental research program TRACSYMBOLS.On Heritage Western Cape formally protected the site as a provincial heritage site.
In the area north-east of the main chamber, deposit expands into a low laying ante-chamber of unknown extent due to the sand filling it.
The TRACSYMBOLS project is led by Professor Christopher S.
Henshilwood based at the Department of Archaeology, History, Cultural Studies and Religion at the University of Bergen and the University of the Witwatersrand, South Africa, together with Professor Francesco d’Errico from the University of Bordeaux 1, France.
Calcium carbonate (Ca CO3) rich ground water seeps in from the cave roof and percolates through the interior sediments, resulting in an alkaline environment with good preservation conditions.
The excavated Middle Stone Age deposit in Blombos Cave consists of aeolian (wind-borne) dune sand, blown in through the cave entrance, and roof spall from the cave ceiling.
By the end of the 2011 field season about 19.5m² of interior cave has been dug during the Blombos Cave excavations.