Define Potential, Developed, Stock and Reserved resources?

Potential resources are those that have been identified at particular places but have not yet been utilised. Thus, these resources are potentially useful but not yet been developed.

Developed resources are those that have been surveyed and identified for their quality and quantity. Their development depends upon the availability of technology.

Stock are materials that can be utilised as resources but lack of adequate technology hampers their development.

Reserves are those materials that can be utilised with existing technology but their use has not yet been started.