Coal Ore is a mineral block that is a common sight on almost all maps. It is found at almost any elevation, from cliff faces, through underground caves and sea bottoms, down to bedrock. On average, there are about 134 coal ores per chunk. It is the only ore to appear well above sea level; coal ore comprises about 1% of all stone, regardless of altitude. Coal veins can vary greatly in size - mountaintop deposits are usually five blocks at most, but underground ones are generally at least ten blocks, and can range up to fifty or more. One can also acquire large amounts of experience by mining coal.