asbogstudy6

Any change in the mineral compositoin of a rock caused by pohyscial or chemical means, espcially by hydrothermal fluids

An analysis of the proportions of metal in an ore. Composition, purity, weight, or other properties of economic interested are tested

The average quantity or percentage of ore minearl content in an ore body

• G_avg = Sums (width of ore vein x assay)
• Sums (widths of ore veins)

a common and chemically acitve metal - lead or copper for example

The mass or weight of a substance per volume that it occupies

The process by which limestone is converted to dolomite by the replacement of calcium carbonate by magnesium carbonate

Oxidation potential; the potential of a half-cell, measured against the standard hydrogen half-cell

An ore deposit that originates later that the enclosing host rocks

The chemical product of exhalation; a deposit formed by the interaction of volcanically derived water and sea water with subjacent rocks

Valuless rock or mineral aggregates in an ore; economically undesirable

A peroleum field containing 500 million barrels or more of recoverable oil; a nautral gas field which has a minimum of 3.5 trillion ft³ of recoverable gas

An iron-bearing weathered product overlying a sulfide deposit

Pertaining to hot water, the action of hot water, or the products of hot water

The process of practically simultaneous solution and deposition of a new mineral in an old mineral by means of interstitial fluids

The negative log₁₀ of the hydrogen-ion activity in a solution, a measure of the acidity or basicity of a solution

An igneous rock that contains phenocrysts in a fine grained matrix

Introduction of, or replacement by, pyrite, a common process of hydrothermal alteration

The degree of progressive meatmorphism of peat (coalification)

Silicate rocks of complex metamorphic-metasomatic mineralogy formed in carbonate rocks in a contact metamorphic aureole

Extraction of ore in an underground mine by working laterally in a series of levels in the plane of the vein

A near-surface process of mineral deposition in which metals are leached by acidic solutions, carried downward, and repreciptated, enriching the sulfide minerals already present

A mineral deposit formed contemporaneously wit, and by the same processes as, the enclosing rocks