A reddish metal, symbol, Cu
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Category: <span>C</span>
An ore containing more than one mineral of economic value
Blast patterns or sequences used to influence the path of the blast
Shares in a company with voting right but no fixed or assured dividend other than the performance of the stock price
A gradual decrease between geologic horizons
An ore of niobium, FeNb2O6
A refractory cupola used to melt minerals or smelt ore
A main support pillar designed to withstand the bulk of overhead weight
Timbers laid at right angles to each other to create a vertical or horizontal support structure
A wide crack, fissure or opening in rock