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Butane

A flammable hydrocarbon gas used as fuel, C4H10

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Bullion

Precious metal poured into bars, and assigned value based on weight, then stamped

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Bulk sample

A representative geological sample of a large mass of mineral, 50kg to thousand tonnes, used to establish an average economic grade

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Bulldozer

Tractor with front mounted, curved steel shovel held by pivoted arms used to move material

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Bulkhead

A large stable and purpose built wall to protect against fire, water, explosion etc.