Geology GGM is hosted in the Geita Greenstone Belt (GGB), which is a northern segment of the Sukumaland Greenstone Belt, located in the northwestern part of the Tanzania Craton and south of Lake Victoria. This Archaean sequence strikes almost east-west, extending for about 80km and is up to 20km wide. The GGB sits dominantly within the Nyanzian Supergroup stratigraphy that is subdivided into the Lower Nyanzian and the Upper Nyanzian Groups. Deposit type A simplified stratigraphy of the main igneous rocks in the Geita area is summarised as: Archaean gabbro, basalts, intermediate to acid volcanoclastic sediments, diorites, tonalites-granodiorites, granites and Proterozoic gabbro dykes. Across the Archaean-Proterozoic rocks there is a property-wide paleo-drainage system, which likely flowed towards Lake Victoria. These late sediments likely represent the remnants of a much thicker package that might have covered all the hills exposed today. Both the Archaean-Proterozoic rocks and paleo-alluvials are covered by ferricrete at different levels of induration and evolution, up to 15m thick. The Geita gold deposits are shear-hosted, Archaean orogenic gold deposits. Within the GGML leases, the GGB is subdivided into three major mineralised trends: - Geita Central Trend, hosting the Nyankanga, Geita Hill and Lone Cone deposits. - Nyamulilima Trend in the west, hosting the Star and Comet, Ridge 8 and Nyamulilima deposits. - Matandani-Kukuluma Trend to the northeast, hosting the Matanda ........

Mining at Geita is by both open pit and underground mining methods. Open pit mining at Nyankanga Cut 8 was completed in 2020. The Nyamulilima open pit commenced production in April 2021 and is scheduled to reach full production during 2022. This mining is done utilising a truck and shovel system operated by Geita with a contractor providing drill and blast support. Underground mining commenced at Star and Comet in 2016 and subsequently at Nyankanga in 2017 and most recently Geita Hill in 2020. Star and Comet underground has successfully transitioned to owner mining and the mining contractor African Underground Mining Services (AUMS) is used at Nyankanga and Geita Hill for underground development and stoping. The underground mining method is a combination of longitudinal and transverse open stoping. Cement Aggregate Fill (CAF) is used at Nyankanga to fill the primary stopes and allows for mining of secondary stopes. Ore is hauled from the Star and Comet and Nyankanga underground operations to the central run of mine (ROM) pad located at the Geita processing plant.

Open Pit
For the open pit operations at Geita, a conventional drill, blast, load and haul shovel and truck open pit mining method is used. This is the same mine method that was used at completed open pits for Nyankanga, Geita Hill, Lone Cone, Matandani, Kukuluma and Star and Comet.

Currently open pit operations are located at the Nyamulilima open pit deposit. The Nyamulilima open pit is com ........

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