A typical copper ore in Canada contains about 2% of the metal. If the annual production of mined copper is about 700000 t, how much ore must be mined annually?

Money,time,

2% = 700000
THEREFORE 100% = ?

100/2 X 700000 = 35000000t

To determine the amount of ore that needs to be mined annually, we can use the information that a typical copper ore in Canada contains about 2% of the metal.

We are given that the annual production of mined copper is 700,000 t. This represents 2% of the total metal content.

By using proportion, we can calculate the amount of ore needed to produce 100% of the copper:
2/100 = 700,000/X

To solve for X (the total amount of ore needed), cross-multiply and solve for X:
2X = 100 * 700,000
2X = 70,000,000
X = 70,000,000 / 2
X = 35,000,000 t

Therefore, annually, approximately 35,000,000 tons of ore must be mined to produce 700,000 tons of copper at a 2% metal content.