$SUBB The resource, which sits on the harbor bottom, is there as a result of 145 years of dumping and spillage, in transit, of coal that was mined during the life of the nearby Lota coal mining operations, which were exhausted and shut down in the 1990’s. The initial reserve calculations in zone 1 of the concession are 275,000 proven, and 90,000 probable, tonnes of recoverable bituminous thermal coal having the following characteristics: 6700 Kcal/Kg, has less than 1% sulfur, and contains 14% ash.