The purest lead ore and with the largest crystals of galena. Hess
Derb. The place where ore is stored for smelting.
A silver-bearing variety of tennantite.
A determination of the concentration of a substance in biological fluids
and tissue by analysis of urine, feces, blood, bone, tissue, etc.
ANSI
A precipitated deposit resulting directly or indirectly from vital
activities of an organism, such as bacterial iron ore or coralline
limestone.
a. See:biogeochemical prospecting
b. Prospecting by means of vegetation. The root systems of trees are
actually powerful sampling mechanisms that represent samples of solutions
from a large volume of earth. Much of the mineral content from these
solutions is found in the leaves. Analysis of leaves may serve as a guide
to prospectors. Lewis
Said of rocks consisting of fragmental organic remains.
Said of a rock resulting from the physiological activities of organisms,
e.g., a coral reef.
An area where the vegetation contains an abnormally high concentration of
metals. Hawkes, 2
Geochemical exploration based on the chemical analysis of systematically
sampled plants in a region, to detect biological concentrations of
elements that might reflect hidden orebodies. The trace-element content of
one or more plant organs is most often measured.
Syn:biochemical prospecting
AGI
A branch of geochemistry that deals with the effects of life processes on
the distribution and fixation of chemical elements in the biosphere.
AGI
A moundlike or circumscribed mass of rock built up by sedentary organisms
such as corals, mollusks, and algae. CF:biostrome
The catalytic action of bacteria, such as Thiobacillus ferroxidans and
Thiobacillus thiooxidans to accelerate chemical oxidation reactions by as
much as 106 times those of chemical reactions alone; esp. useful
in leaching copper and uranium systems. SME, 1
a. A group name for minerals formed by biologic action. AGI
b. See:biolith
c. An old term for a concretion formed through the action of living
organisms. AGI
A rock of organic origin; a biogenic rock.
The emission of visible light by living organisms. Hy
A deposit due to the detrital accumulation of organic material, as in the
cases of limestones and coal. AGI
See:ecology
See:black shale
a. An element that is required by or found in the bodies of living
organisms. The list of such elements includes carbon, hydrogen, oxygen,
nitrogen, phosphorus, sulfur, chlorine, iodine, bromine, calcium,
magnesium, potassium, sodium, vanadium, iron, manganese, and copper. All
may belong also to the chalcophile or lithophile groups. Hess
b. Said of those elements that are the most typical in organisms and
organic material. AGI
c. Said of those elements that are concentrated in and by living plants
and animals. AGI
A tank equipped for temperature, pH, and reagent control used to employ
bacteria to oxidize or reduce ores of gold and other metals and render
them amenable for metal extraction by leaching.