From 2009 to 2011 the agricultural, economic and environmental effects of the production and use of mineral concentrates, produced from animal slurry, were studied. Part of the study was the monitoring of the 8 participating full-scale (pilot) plants to assess the chemical composition of the half products and the end products of the process. In 2012 - 2014 the monitoring programme was continued with 9 pilot plants. In this programme additional data from the pilot plants were collected on the chemical composition of the raw slurry and the end products. Samples from these process streams were analysed on dry matter, volatile solids and the main nutrients N, P and K. The raw material of 8 pilot plants was pig slurry only. One plant used effluent from a biogas plant mixed with pig slurry as a feedstock.