Question

How many pounds of gold ore would need to be processed to obtain 5 grams of gold (Au) if the ore is 0.1% gold by mass?

Answer 1

Pounds of gold ore : 11,02311

Further explanation

Given

5 g of gold

0.1% gold by mass

Required

Pounds of gold ore

Solution

`\tt \%mass~gold=(mass~gold)/(mass~ore)* 100\%`

For percent mass = 0.1%, than mass of gold ore :

`\tt 0.1\%=(5~g)/(mass~ore)* 100\%\\\\mass~ore=(5* 100)/(0.1)\\\\mass~ore=5000~g`

Conversion factor :

1 g = 0,00220462 pound, than for 5000 g = 11,02311 pounds