AP Environmental Science 5.K: Mining Extraction

1 point of grams of gold that could be extracted from the deposit. Show your work.
One point for the correct setup to calculate the number of grams of gold that could be extracted from the gold deposit:
Accept one of the following:

- 260 million metric tons $\times \frac{5 \text { grams }}{1 \text { metric ton }}$

- $260 \times 10^{6}$ metric tons $\times 5$ grams

- 5 × 260,000,000

One point for the correct calculation of the number of grams of gold that could be extracted 1 point from the gold deposit:
Accept one of the following:

- 1,300,000,000

- $1.3 \times 10^{9}$

Total for part (e)

2 points

One point for the correct setup to calculate the value of the gold that could be recovered:

Accept one of the following:

- $\frac{\$ 62.56}{1 \text { gram }} \times 1,000$ metric tons $\times \frac{5 \text { grams }}{1 \text { metric ton }}$

- $62.56 × 1,000 metric tons × 5 grams

- $\frac{\$ 62.56}{\mathrm{~g}} \times \frac{5 \mathrm{~g}}{\text { metric ton }} \times 1,000$

- $1,000 \times 5 \times \$ 62.56$

1 point

One point for the correct calculation of the value of gold that could be recovered:

Accept one of the following:

- $312,800

- 312,800 dollars

1 point

Total for part (f)

2 points

One point for the correct setup to calculate the number of metric tons of gold ore that would need to be mined to manufacture 100,000 cell phones:
Accept one of the following:

- $\frac{0.034 \text { grams }}{1 \text { cell phone }} \times \frac{1 \text { metric ton }}{5 \text { grams }} \times 100,000$ cell phones

- $\frac{0.034 \text { grams }}{1 \text { cell phone }} \times \frac{1 \text { metric ton }}{5 \text { grams }} \times 100,000$

- 0.034 grams $\times \frac{1 \text { metric ton }}{5 \text { grams }} \times 100,000$

- $\frac{0.034 \times 100,000}{5}$

One point for the correct calculation of the number of metric tons of gold ore that would 1 point need to be mined to manufacture 100,000 cell phones:

- 680

Total for part (g)

for question 3

10 points