Possible Clues:

• Massive failure in fossil fuel
• In coal one may lose an enormous amount
• In fossil fuel there's no gain, to a very great extent
• Mammoth found death among the black stuff
• No very great profit to be made in fuel
• So locals may be huge
• Huge reason for red ink in fossil fuel
• Very big deficiency in product of mine
• Really huge
• Great catcher rising after pass