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Type of veins which are bodies of tubular shape in pre-existing fissures?

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Type of veins which are bodies of tubular shape in pre-existing fissures?

(a) Fissure-veins

(b) Ladder-veins

(c) Gash-veins

(d) Stock works

This question was posed to me in a national level competition.

I'd like to ask this question from Origin of Ore Deposits topic in portion Economic Mineral Deposits of Engineering Geology

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Right answer is (a) Fissure-veins

The best explanation: Fissure-veins may be defined as mineral bodies of elongated or tabular shape deposited in pre-existing fissures. The original fissures may be parallel or intersecting, radial or fan-shaped in pattern and that is also the shape of the resulting ore bodies.

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