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L
labile - (4) rocks and minerals that easily decompose.
lacustrine materials - (4) sediments that have settled from
suspension and underwater gravity flows, such as turbidity currents,
in bodies of standing fresh water, or sediments that have accumulated
at their margins through the action of waves.
leachability - (4) a quantitative or qualitative term used
to describe the degree of reaction with a leaching agent. Leachability
can be reported for the whole or a portion of a sample or mine component
and is determined by the solubility of the reactant and the type,
relative volume and percolation rate of solvent.
leachate - (3) the liquid that has percolated through and
dissolved minerals out of ore. (4) solution obtained from a leaching
process.
leaching - (1)(2) (a) the removal of the more soluble minerals
by percolating water, (b) extracting a soluble metallic compound
from an ore by selectively dissolving it in a suitable solvent such
as water, sulfuric acid, hydrochloric acid, cyanide, etc. (4) the
extraction of soluble constituents by percolating a solvent through
it. Natural or induced process. See also solubility.
leach pad - (1) a specially prepared area covered by an
impervious liner on which ore is placed for leaching.
legal description - (2) the Township, Range, Section and
typically quarter/quarter section location.
leasable minerals - (3) minerals whose extraction from federal
land requires a lease and the payment of royalties. Leasable minerals
include coal, oil and gas, oil shale and tar sands, potash, phosphate,
sodium, and geothermal steam.
legal land description - (3) the method of locating or describing
the land in relationship to the public land survey.
lek - (3) an assembly area where birds, especially sage
grouse, carry on display and courtship behavior.
liability - (4) all outstanding work requirements or equivalent
monetary requirements.
lime - a generic term used to describe neutralizing minerals
or chemicals such as limestone, quick lime or hydrated
lime.
lignin - (3) the major noncellulose constituent of wood.
limestone - (4) a sedimentary rock consisting largely of
calcite (CaCO3). Dolomite, chert and clay are common impurities.
lithify - (4) to make into rock.
litter - (3) the uppermost layer of organic debris on the
soil surface, essentially the freshly fallen or slightly decomposed
vegetal material.
locatable minerals - (3) minerals that may be acquired under
the Mining Law of 1872, as amended.
lode - (1) aggregations of mineral matter containing ores
in fissures. (3) a mineral deposit in solid rock.
lode mining - (3) mining of a mineral deposit in solid rock.
losing (influent) stream - (3) a stream or reach of a stream
that contributes water to the zone of saturation and develops bank
storage; it's channel lies above the water table. See also gaining
stream
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