Mazowe Mine is a merger of several formerly independent mines of which the old Jumbo mine was the single most important producer. Host rocks to the mineralization are the Jumbo granodiorite stock and the slightly earlier, comagmatic Jumbo quartz-feldspar porphyry, both intrusive into mainly metadacites and metasediments of the Passaford and Mount Hampden Formations. The ore bodies are found in subparallel, planar shear zones striking nearly E±W and dipping 25±45°N. The major ore bodies, formerly independent mines, are known (from S to N) as the Carn Brae, Birthday, Nucleus, Jumbo, Connaught, Bojum, Bucks, SOS, and Flowing Bowl reefs, which are separated on outcrop by between 100 and 300 m and can be followed for about 500 to 1500 m along strike (see Fig. 5 of Blenkinsop et al. this issue). The major sections of the E±W striking reefs are hosted in the Jumbo granodiorite stock, but also extend eastwards into the Jumbo porphyry and greenstones. The reefs are exposed by underground mining which presently extends down to the 28th level (about 900 m below the shaft collar). The reefs have average widths of 20 cm but commonly split into mineralized stringer zones some 30±60 cm wide which may join again or cross to adjoining reefs.

The ores are dominated by pyrite, which is often massive, quartz and rarer carbonate, which together form veins usually a few centimetres wide. Gold is mainly associated with the pyrite, and to a lesser degree with quartz. Contacts of the vein ........

The current hoisting capacity is 19ktpm. The average mined grade is 4.2g/t Au.

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