In a mineralized staurolite-garnet-biotite schist, the estimated metasomatic sulfide mineralization is 4%, with ore mineral proportions of 30% chalcopyrite, 20% pyrite, and the rest being magnetite. The maximum grade of Cu will be _ __ _ g/ton (Round off to the nearest integer)
In a mineralized staurolite-garnet-biotite schist, the estimated metasomatic sulfide mineralization is 4%, with ore mineral proportions of 30% chalcopyrite, 20% pyrite, and the rest being magnetite. The maximum grade of Cu will be _ __ _ g/ton (Round off to the nearest integer)
Show Hint
Correct Answer: 12
Solution and Explanation
Step 1: Given: The sulfide mineralization is 4\% of the total mineralization. Therefore, the total quantity of sulfide minerals is:
\[ \text{Sulfide minerals} = 4\% \, \text{of total} \]
Step 2: The ore mineral proportions are given as:
- Chalcopyrite: 30%
- Pyrite: 20%
- Magnetite: The rest of the minerals, i.e., 50% (100% - 30% - 20%).
Step 3:
The maximum grade of Cu will be determined by the chalcopyrite content, as chalcopyrite contains copper. The fraction of chalcopyrite in the total sulfide mineralization is 30% of 4%. Therefore, the percentage of Cu content is:
\[ \text{Cu content fraction} = \frac{30}{100} \times 4 = 1.2% \, \text{Cu} \]
Step 4: Now, convert the percentage of Cu to g/ton by considering the total mineralization:
\[ \text{Grade of Cu} = 1.2% \, \text{of 1000 kg} = 12 \, \text{g/ton} \]
Step 5: Thus, the maximum grade of Cu is 12 g/ton.
\[ \boxed{12 \, \text{g/ton}} \]
Top IIT JAM GG Geology Questions
- The mineral assemblage found in a granulite facies metabasalt is
- Glossopteris is found in which of the following formations?
- In a sequence of undeformed sedimentary rocks, younger rocks overlie older rocks. This conforms to the principle of
- Dropstones are found in
- The sedimentary structure formed by unidirectional current is
Top IIT JAM GG Geochronology Questions
The given section with uniform lithology and sedimentation rate records two ash layers dated at 77 Ma and 76 Ma, respectively. An index fossil species present in the lower part of the section becomes extinct at a horizon 7 m above the base. The estimated age of the extinction event is _________ Ma. (Answer in integer.)
- If the activity of a radioactive mineral falls from 800 counts/s to 500 counts/s in 80 minutes, the half-life of the mineral is ________ minutes. (Round off to two decimal places.)
- The number of alpha (\(\alpha\)) particles emitted to produce a daughter isotope of \(^{206}\text{Pb}\) from a parent isotope of \(^{238}\text{U}\) by radioactive decay is ........
- Choose the material on which \(^{14}C\) dating technique can be correctly applied.
- In the \(^{87}Rb-^{87}Sr\) isotopic systematics applied to terrestrial rocks, the slope of the isochron \( (e^{\lambda t} - 1) \) can be approximated as \( \lambda t \), where \( \lambda \) is the decay constant and \( t \) is time. Choose the correct option that justifies this approximation.
Top IIT JAM GG Questions
- The mineral assemblage found in a granulite facies metabasalt is
- Glossopteris is found in which of the following formations?
- In a sequence of undeformed sedimentary rocks, younger rocks overlie older rocks. This conforms to the principle of
- Dropstones are found in
- The sedimentary structure formed by unidirectional current is