You aren't close to Homer , but -
The coal that washes up on Homer beaches comes from veins in the bluffs that line Cook Inlet and overlook town. Boulder-size sections of coal break off the cliffs, are churned up in the ocean and wash onto area beaches in smaller pieces. And Hamm needs about 9,000 pounds of coal to heat her home every winter. They said - The coal does contain a lot of sulphur, this is what smells when it burns. The sulphur combined with water can make sulphuric acid, and this will corrode regular steel over time.