Question

Define how are minerals formed in veins and lodes?

Answer 1

Mode of Occurrence of Minerals
Minerals are generally found in " ores " ,
which is actually an accumulation of
any mineral mixed with other elements.
To obtain a pure mineral, the it has to
be separated from its ore .
This process of separating the mineral
from its ore is called smelting
Smelting of iron ore
Minerals generally occur in many forms ,
they are :
1. Veins and Lodes
Minerals generally occur in the cracks ,
crevices , faults and joints of the igneous
and metamorphic rocks . Smaller
occurrence of such type is called a vein
and a larger occurrence is called a lode .
Gold being extracted from a vein
2. Beds or Layers
The minerals which are formed as a
result of deposition , accumulation and
concentration generally occur in
horizontal layers.
Mineral deposits in layersCoal deposits
3. Residual mass of weathered particles
When the decomposed rocks are
washed away by water, the soluble
constituents are removed leaving a mass
containing ores . Such occurrences are
called residual mass. Bauxite occurs in
such a mode .
.
Bauxite deposits left out after being
washed out
4. Alluvial deposits or Placer deposits
These are the deposits found in the
sands of valley floor and at the foot hill .
These deposits consist of the minerals
which cannot be corroded by water .
Mining in placer deposits
Gold in pla

Answer 2

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