The mine produced a small amount of copper between 1908 and 1917. Moreton's Harbour mine Volcanic rocks at Moreton's Harbour include pillow lava, ash and breccia formed when pillows exploded as they were quenched on the sea floor. All of the volcanic rock types are intruded by diabase dykes that acted as feeders to the volcanoes. Drive to Moreton's Harbour, and take the road that circles the east side of the harbour. Turn left off this road onto a gravel road that continues around the harbour, and park where a picket fence encloses two satellite dishes.
Old paths continue around the coast for some distance, and the views are wonderful.
As you enter Little Harbour, note the rough flow texture of the lava on your right, and the smooth, glacially polished and fluted diabase outcrops on your left down by the shore. Beyond the fields on the shore, and best seen at low tide, are pillows, and splattered volcanic ash and lava fragments. The small holes in some of the rocks were once gas bubbles in the molten lava. These features indicate an explosive volcanic environment. Up behind the field, through an opening in the woods is an old antimony mine that was developed sporadically between 1892 and 1916, producing a total of 140 or so tons of ore.