Applied Math Flashcards
1
Q
- A Copper Mining operation produces 10, 000 dry short tones per day of 1% copper grade which it sends to a concentrator, which in turn produces a 30% copper concentrate at a recovery of 90%. What is the concentration ratio?
a. 37.5:1
b. 33.3:1
c. 27.5:1
d. 27.0:1
e. None of these
A
B
2
Q
- A copper mine delivers 1, 800 dry short tons of ore with a grade of 1% to the concentrator which in turn mills and processes it at a concentration ratio of 30 to 1 producing concentrate at a grade of 25%. What is the mill recovery?
a. 80%
b. 83.3%
c. 90%
d. 85%
e. None of these
A
B
3
Q
- The chromite ore feed to the mill of Heritage Resources was assayed to contain 48% chromite. What is the chromium content of the ore?
a. 22.84
b. 12.84
c. 42.84
d. 32.84
e. None of these
A
E
4
Q
- If the feed to an ore dressing plant assayed 12% galena, how much lead is in the concentrate if the feed is 1, 000 DMT and the recovery is 80%
a. 83.14 MT
b. 103.14 MT
c. 63.13 MT
d. 73.14 MT
e. 93.14 MT
A
A
5
Q
- The iron sulfide concentrates of Philippine Pyrite Corp. are known to assay 27% pyrite. What is the % sulfur content of the concentrates assuming it contains no other sulfide minerals?
a. 15.43
b. 14.43
c. 13.43
d. 12.43
e. 11.43
A
B
6
Q
- If the feed to a copper mill assays 10% chalcopyrite, what is the sulfur content if the specific gravity of the ore is 2.5?
a. 1.49%
b. 5.49%
c. 4.49%
d. 2.49%
e. 3.49%
A
E
7
Q
- The feed to the copper mill is assayed to contain 15% chalcopyrite. What is the % Fe content of the ore?
a. 1.56
b. 5.56
c. 4.56
d. 3.56
e. 2.56
A
C
8
Q
- The feed to the copper mill is assayed to contain 15% chalcopyrite. What is the % Fe content of the ore?
a. 1.56
b. 5.56
c. 4.56
d. 3.56
e. 2.56
A
D
9
Q
- The mine delivery of Padcal’s block cave mine assayed 12% chalcopyrite, 16% chalcocite, 10% bornite, and 6% pyrite. What is the total % copper content of the mill feed?
a. 33.27%
b. 53.27%
c. 43.27%
d. 3.27%
e. 23.27%
A
E
10
Q
- The recent export of chromite concentrates to Turkey by Heritage Resources was surveyed by SGS Philippines and known to contained 15, 600 WMT with 12.2% moisture and assaying 48% Cr203, 12% Al2O3, 6% MgO, 0.55% SiO2, and 25% Feo. What is the resulting Cr : Fe ratio of the shipment?
a. 1.89:1
b. 1.49:1
c. 1.79:1
d. 1.69:1
e. 1.59:1
A
D
11
Q
- The chromite concentrate exports of Heritage Resources were assayed to contain 48% chromite and 25% magnetite. What is the calculated Cr: Fe ratio of the concentrate?
a. 5.23:1
b. 4.23:1
c. 2.23:1
d. 1.23:1
e. 3.23:1
A
D
12
Q
- A huge copper deposit with considerable gold and silver contents has a copper grade of 0.50% total Cu. The deposit also contains large amount of leachable copper oxides. If the acid soluble copper content on the ore is 0.03%, what is the recoverable copper content of the ore if conventional flotation is used with sulfidization?
a. 0.47% Cu
b. 16.67% Cu
c. 0.053% Cu
d. 17.67% Cu
e. 0.015% Cu
A
A
13
Q
- The kingking copper deposit of Benguet Corp. in Maco, Compostella Valley is known to contain mostly oxide copper minerals, hence most beneficial for leaching processes. If the total copper content is 0.80% Cu while recoverable by conventional flotation and assuming no sulfidization is applied to the ore?
a. 0.50%
b. 0.40%
c. 0..60%
d. 0.70%
e. 0.30%
A
A
14
Q
- What is the ratio of concentration for a treated copper ore with the following assays: feed=0.30% Cu, concentrate=25% Cu, tails= 0.040$ Cu
a. 95:1
b. 96:1
c. 95.4:1
d. 97:1
e. None of these
A
B
15
Q
- A copper mine delivers 1, 800 dry short tons of ore with a grade of 1% to the concentrator which in turn mills and processes it at a concentration ratio of 30 to 1 producing concentrate at a grade of 25%. What is the mill recovery?
a. 80%
b. 83.3%
c. 90%
d. 85%
e. None of these
A
B
