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Lamprophyre

An igneous sedimentary rock, composed of altered mafic and ultramafic minerals

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Lamellar

A term used to describe the arrangement of leaves or sheets in a structure, sometimes bound on a side

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Lagging

Planks, rods, beams or timbers used to between steel ribbing of an underground structure to fortify support and prevent the picture or rupture of a roof and overlying rocks

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Lactic acid

A chemical agent sometimes used in the process flotation to depress iron minerals

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Low-grade

Ore containing a small but detectable grade of mineralization, favourable only if the extent of mineralization is enormous, consistent, and accessible

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Long tom

A trough usually 2 meters long, used for washing gold-bearing earth utilizing moving water and a series of riffles for trapping heavy particles. It is longer than a rocker or sluice

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Lens

A rock body thick in the middle and tapered out at its ends

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Long ton

2,240 lbs. avoirdupois, compared to a short ton, which is 2,000 lbs.