Find the integral. 
Definitions:
Coal
A flammable black or dark brown sedimentary rock primarily utilized for energy production.
Iron Ore
A naturally occurring mineral from which iron (Fe) is extracted to make steel and various other products.
Wildlife
Wild animals collectively; the native flora and fauna in a particular region not domesticated or cultivated by humans.
Mining Firm's Output
The total amount of minerals or resources produced by a mining company within a specific time period.
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