If there are 70 million tons of ore, and that gonna produce about 7 metric million

If there are 70 million tons of ore, and that gonna produce about 7 metric million tons of zinc metal over a country in 24 years.
sphalerite is a mineral that is the chief ore of zinc. it consists largely of zinc sulfide in crystalline form but almost always contains variable iron.
if cadmium (cd) content of four sphalerite samples at the country averaged about 110,000 ppm.
if cd can cause kidney damage to human, and the drinking water stander for cd in drinking water is under 0.005 (mg/l)2
answer the following questions:
a. what's the amount (in metric tons) of sphalerite gonna be mined to obtain that 6.96 metric million tons of zinc metal?
b. what's the amount (in metric tons) of refined cd metal were produced over the years at the country?
c. does the drinking water standard apply?
d. what's the max contaminant level allowed?