Step 1: Reading the question:
Three facts are given about the mineral deposit: it is already known, it is not being used today, and the reason is lack of technology.
Step 2: Matching the facts with the types of resources by stage of use:
Developed resources are in use now, so the second fact rules them out.
Reserves can be used with present technology. The third fact says the technology is missing, so this is ruled out too.
A renewable resource is a type based on replenishment, not on whether it is in use, so it is not the answer we want.
Step 3: What is left:
Resources that exist in an area but are not yet used are called potential resources. For example, the wind and solar energy of Rajasthan and Gujarat is available but is not yet developed fully.
Our mineral deposit behaves in the same way. It is there, but it waits for technology.
Once the technology becomes available, the deposit can move from the potential group to the developed group. Until then it stays potential.
Step 4: Conclusion:
Only option C matches all three facts.
Final Answer:
The correct category is potential resource, option C.
\[ \boxed{\text{C. Potential resource}} \]