What sort of geological features would you look for to find copper?
Two types, low volume high concentrations, and vice versa. For high concentrations start with gravity mapping, and check out high Bouguer anomalies. Generally speaking basic and intermediate igneous, and metamorphic terraines are a better bet than sedimentary terrains - though circulating groundwaters and water-rock interaction can produce local copper shows almost anywhere. Regional mapping of surface water and sediment chemistry should highlight the areas worth exploring. Search for oxidized copper minerals like malachite, azurite, brochantite, etc.

In Australia one of the richest copper mining areas was famously discovered by a dog chasing a rabbit into its' hole. The dog owner found malachite in the excavated spoil of the rabbit warren.

On the big industrial scale, (high volume, low grade) look for copper porphyry of Andean type, which should be obvious from general geological mapping.

A crude but novel way of exploring is to dump bits of scrap iron in local streams, then check them out a few weeks/months later to see if iron-copper exchange has occurred.