Figure 4. Surface geology of the Faraday Mine. The samples here came from a granite pegmatite dike which cuts a gabbro, which in turn cust metasedimentary rock units including marble in which stromatolites have been reported just to the south of this mine. The system of dykes was mined for its uranium. (After Hewitt, Map 1957-1, 1957 and Masson, Map p.2523, 1982, reproduce by permission.)