| http://www.w3.org/ns/prov#value | - The decrease is mainly due to an $8 million decline in revenue from the Voisey???s Bay mine, offset by royalty revenue from the Skyline thermal coal mine of $192,000, the Johnson Camp copper mine of $175,000, the Gwalia Deeps gold mine of $411,000 and the recently commissioned Las Cruces copper mine of $125,000.
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