How is nickel mined and extracted from its ores?

What are the appropriate word and chemical equations for this process?


Nickel can be extracted directly from its ore by reduction by hydrogen or carbon monoxide at elevated temperature at $600\ \mathrm{^\circ C}$ to $650\ \mathrm{^\circ C}$:

$$\ce{NiO + H2 -> Ni + H2O}$$

$$\ce{NiO + CO -> Ni + CO2}$$

Also, it can be extracted by treatment with dilute sulfuric acid following by precipitation:

$$\ce{NiO + 2H+ -> Ni^2+ + H2O}$$

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