All in all there are ten known copper mines and two iron mines on the Ølve peninsula. Geologically, the nine mines on Varaldsøy Island also should be figured in. The industry began at Lilledal in 1642 wth the mining of iron ore. From Jernsmauget by Dyråsen, the iron ore was sent to the iron works in eastern Norway.
Road cuts and blast areas are a joy to rock collectors, even if the disturbance to nature is ever so disfiguring. These are the best kinds of places to hunt for crystals, which otherwise are removed by weather and wind. In the Ågotnes area there are especially many beautiful crystals to be found.
Large quantities of nickel ore have been mined from Litlandsvatnet, between Lonevågen and Hosanger. The discovery was made in 1875. During the period of operation from 1882 to 1945, 4170 tonnes of pure nickel were extracted from 462 000 tonnes of ore, a large production by Norwegian standards.
On Vågenes, on one of the prominences out toward Eitrevågen, one finds garnets in anorthosite. The garnets are both older, and not least bigger, than average.
During the summer of 1979 a rock was found at Lykling in Bømlo that contained 450 grams of gold, and at the end of the 1980s a great many gold samples were laid out for sale. In the old mining area there are still gold miners hunting for the precious metal. But, the big adventure stories are a thing of the past.