The masters. or owners. of mining rights for the exploration of ores were prospectors and free or independent prospectors. Concession books and registers were kept about the proprietors of ore fields or mines. https://rtdtoysmggx9.bloginwi.com/68598345/design-and-performance-analysis-of-axial-flux-permanent-magnet-machines-with-double-stator-dislocation-using-a-combined-wye-delta-connection