The Property is underlain by Neoproterozoic upper green schist to lower amphibolite facies volcanics and sedimentary units of the Augaro Adobha Belt. The stratigraphy comprises a lower sedimentary sequence of carbonates and fine grained siliciclastic rocks, including siliceous iron formation; an overlying volcanic sequence of mafic to felsic lapilli and ash crystal lapilli tuffs with intercalated minor mafic flows and hyaloclastite; and an uppermost sequence of fine grained volcaniclastic and siliciclastic rocks.

In the volcanic sequence, rhyolites are the predominant volcanic rock type. These are mostly tuffs, with minor blocky flows and agglomerates. Dacites comprise approximately 5% of the volcanic strata. Other volcanic rocks include tholeiitic basalts. The strata are cut by Neoproterozoic granite-syenite intrusions and minor mafic dykes/sills, and by Cenozoic felsic and mafic dykes. One suite of quartz and feldspar phyric rhyolite/granite dykes is texturally and chemically distinct from the other felsic strata. They occur as rhyolite porphyry, or as granitic rocks.

The Bisha Gabbroic Complex is a large, partly layered, tholeiitic gabbro–gabbro–norite intrusion that forms high hills in the central and southern part of the Property. The complex extends in a north–northeast to south–southwest orientation for 25 km, and has a maximum width of approximately 12 km. The complex is probably coeval or nearly coeval with the strata.

The Bisha Main and Harena deposits are mined as a conventional open pit operation. At
Bisha Main, most of the in-pit haulage for waste will be carried out using 65-tonne haulage trucks and 10 m3 excavators, in 5 m benches. To control mining dilution and to increase selectivity smaller excavators will be utilised for ore mining. Harena pit will be mined using the same mining fleet and also in 5 m benches.

Waste rock will be moved and hauled to multiple rock storage facilities based on their geochemical characteristics and period of operation. Some of the mineralised waste will be stockpiled near the pit so that it can be recovered if commodity prices increase from current levels.

The 2.4 Mtpa BMSC process plant Phase III expansion was commissioned in mid-2016 to process Primary material from the Bisha Main and Harena pits. The Phase III expansion now includes separate copper and zinc flotation circuits, concentrate dewatering/handling and tailings thickening prior to pumping and disposal in the tailings management facility.

Flowsheet modifications have been recently introduced, including the redirection of the concentrate from the first two copper and zinc rougher flotation cells to final concentrate. Recent production results show the production of a saleable copper concentrate, displacing the bulk concentrate generated in 2016 as well as steadily improving recoveries.