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 shape of resulting ore bodies.

Deluvial placers is term used when gravity is agency involved; such placers would be found along foot hills and talus slopes.

Magmatic ore deposits commonly occur in following forms: segregations, disseminations and injections.

Syngenetic deposits are such deposits that have formed simultaneously with enclosing rock. These are eir of igneous or of sedimentary types.

Ladder-veins are commonly found in igneous rocks such as dykes and similar bodies and consist of transverse, roughly regularly spaced fractures that are filled with deposits of economic minerals.

Ore mineral is defined as a mineral which contains a metallic element in a quantity that can be exploited and extracted for use at an economical cost.

A few non-metallic minerals are often found associated with an ore-mineral. These have be separated from ore before same is processed for extraction of metal. These associated minerals are called gangue minerals.

The three essential conditions for formation of hydrormal deposits are: highly active and enriched fluids, suitable pathways for ir migration through rocks, and suitable physic-chemical environment for ir deposition to take place.

Natural concentration of an ore mineral in a massive rock body is defined as an ore deposit. Hence definition of an ore deposit is also size dependent.

On basis of ir time of formation relative to host rock, ore deposits are divided into two groups: syngenetic and epigenetic.