Step 1: Understanding the question.
The question is asking about the mineral related to the Guhmahesani mine. Guhmahesani is known for its bauxite deposits. Bauxite is the primary ore of aluminum.
Step 2: Analyzing the options.
(A) लोहा-अयस्क: This is incorrect, as the Guhmahesani mine is not known for iron ore.
(B) कोयला: This is incorrect, as Guhmahesani is not a coal mine.
(C) बॉक्साइट: Correct — Guhmahesani is known for bauxite mining, which is the ore from which aluminum is extracted.
(D) ताँबा: This is incorrect, as Guhmahesani does not have copper deposits.
Step 3: Conclusion.
The correct answer is (C) बॉक्साइट, as Guhmahesani is related to bauxite mining.