Production so far in 1987 was at 25,708,000 tons, down 12 percent.
The potential annual catch from the area has been estimated at 4.5 million tons.
"To be able to do that at five tons means you have a very understanding animal."
By 1952 the mine was operating at 10,000 tons per day.
Production peaked at more than 35 million tons in 1953.
At 35,000 tons, they would be large ships for their day.
She was 78 feet long and rated at 49 tons.
Coal production was at 9.254 million short tons as of 2007.
The total capture of fish was at 3,191,068 tons in 2005.
The potential catch is estimated at 500,000 tons of fish.