The greatest contributors to the increase in value were: nickel, up 155.8%; zinc, up 40.0%; and copper, up 20.5%. While the value of gold production increased marginally, by 0.5%, gold continued to account for more than $2.2 bi llion of the total value of metallic production.
The value of output in 1988 for nonmetallic minerals, which include asbestos, potash and sulphur, increased by 12.6% to $2.7 billion from $2.4 billion. Structural materials such as sand and gravel, stone, cement and lime, increased by 1.6% to $2.8 billion.
The top commodities in terms of value of output for the non-fuel sector of the mineral industry in 1988 were nickel ($3.3 billion), copper ($2.3 billion), gold ($2.2 billion), zinc ($2.1 billion), iron ore ($1.4 billion), uranium ($1.1 billion), and potash ($1.1 billion).
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