Dark, igneous, low-silica rocks
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Tag: <span>B</span>
The ceiling or roof of an adit or mine opening
Non-ferrous industrial metals excluding precious, rare earth or radioactive metals. Base metals include copper, aluminum, lead, nickel, tin and zinc
Similar to a ball mill, a dry ore mill in which steel balls rotate in a horizontal circle, ore is fed through for pulverization into finer grades
Dwellings or structures supportive to the efficient exploration, development or exploitation of a resource, usually assigned for proximity or feasibility
The oldest rocks in a formation
Material usually above bedrock and under soil
A volcanic, extrusive rock comprised of plagioclase, pyroxene with some olivine
A silvery-white, alkaline earth group element. Symbol, Ba
A banded formation of minerals containing a high percentage of iron