Section 17 in The Minerals (Evidence of Mineral Contents) Rules, 2015
17. Intrinsically Economic (E3) Quantities, reported in tonnes or volume with grade/ quality, estimated by means of a Geological Study to be of intrinsic economic interest. Since the Geological Study includes only a preliminary evaluation of Economic Viability, no distinction can be made between economic and potentially economic. These Resources are therefore said to lie in the range of economic to potentially economic.
