Royalties on production discriminate against ageing mines, with high extraction costs.
ECONOMIST: The political dangers of taxing carbon and mining
Suncor has run into an extra rich piece of ore with a high coal component, he said, which caused problems in the extraction process.
FORBES: Magazine Article
Fracking is a technique of shale gas extraction that involves pumping water and chemicals into shale rock at high pressure to extract gas.
BBC: Lancashire shale gas 'could be worth billions'
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