Question

As per the UNFC mineral resources classification system, the highest category of resource is indicated by

• A. 111
• B. 122
• C. 333
• D. 334

Hint:

Remember that in UNFC, a lower digit on each of the three axes (economic, feasibility, geological) means a stronger, more certain resource.

Answer 1

The Correct Option is A

Step 1: Understanding the Question.
The United Nations Framework Classification (UNFC) for mineral resources sorts every deposit using a three digit code. Each digit stands for one axis of confidence: economic viability (E), the stage of the project (F), and how well the geology is known (G). The question asks which three digit code marks the highest, most certain category of resource.

Step 2: Key Formula or Approach.
In UNFC-2009, a lower digit on every axis always means a stronger, better known deposit. E1 means the deposit is economically viable right now. F1 means a feasibility study or mining is already confirmed and in progress. G1 means the geology has been explored in detail with high confidence, close to what used to be called "proved reserves." So the strongest possible category is the one where every digit is 1.

Step 3: Detailed Explanation.
Option (A) 111 combines E1, F1 and G1: economically viable, a confirmed feasibility or mining stage, and detailed geological knowledge. This is the top class, equal to a proved and mineable reserve.
Option (B) 122 mixes E1 with F2 and G2, a lower stage of project development and less detailed geology, so it ranks below 111.
Option (C) 333 has E3, F3 and G3, which marks a resource not yet shown to be economic and known only at a preliminary level, far from the top class.
Option (D) 334 is even weaker on the geological axis (G4), the least explored category in the system.

Step 4: Final Answer.
The code with the lowest, strongest digit on every axis is 111, so that marks the highest category of mineral resource under UNFC.
\[ \boxed{111} \]