This book summarises the results of numerous research experiments on the biomineralization of rocks and minerals carried out with the participation of the fungus Aspergillus niger. This compilation reviews recent advances in biocompounds and products with the most relevant biological and biocatalytic activities produced by Aspergillus niger. The challenges and future perspectives of biotechnological process extensions using Aspergillus niger will also be discussed. The closing study focuses on how Aspergillus niger may be utilized as a bioadsorbent for the detoxification and decolorizing of wastewater. In industrial and pharmaceutical applications, it can similarly be utilized in the creation of some costly and helpful biopolymers, such as chitin, chitosan, and nourishment enhancements like chitin-glucan and glucosamine.