The Kumasi Metropolitan area is dominated by the Middle Precambrian Rock. The effect of this unique geological structure in the metropolis has both positive and negative impacts on the local economy. The very existence of the Precambrian Rock has led to the development of the construction industry in the metropolis.
There are a few small-scale mining activities and the proliferation of stone Quarrying and Sand Winning Industries. Even though these have created employment opportunities, the uncontrolled extraction of these resources poses environmental hazards.
Soils and Agricultural Land Use
The major soil type of the metropolis is the Forest Ochrosol. The detailed soil associations are the following: Kumasi - Offin Compound Association; Bomso – Offin Compound Association; Nhyanao - Tinkong Association; Bomso – Suko Simple Association; Bekwai – Oda Compound Association and Bekwai – Akumadan – Oda Compound Association. It is a very rich type of soil that has made it possible for a lot of foodstuff (vegetables, plantain, cassava etc) to be grown in the periphery.