Blackgold is another name for oil
oil is blackgold and used in every essential machinery
May refer to coal, oil, coffee, African slaves, songs by Rock Bands, Literature, Films and even the name of a race horse
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By weight, a gem-stone quality diamond is more valuable than oil.
Venezuela's most valuable resource is oil.
Oil and natural gas.
Oil has many uses.
oil
Their oil!
oil.
Of the fossil fuels (coal, oil and natural gas).