There are many minerals that you can get from mining. There are gold, metals and other minerals that are valuable. If you sell them then you would make lots of money. That is why, you see lots of mining company opening their business. Needless to say that this is one of the most profitable business wherever you are in the world. Sure, you would need lots of equipment and that is why those who have lots of money are the ones that like to engage in this kind of business. They know that they would not only double, but triple their money if they are going to invest on the industry. Sure, it won't be easy, but nothing in this world is easy.
Fortunately, you won't need to dig up all those minerals since you just need to transport them to the manufacturing plant. Your duty is to get the minerals to the manufacturing plant. Each mineral that you transported has a money equivalent. You can use the money to buy some upgrade for your truck. The game gets more exciting and harder as you make some progress. Remember that you don't need to go at full speed just to deliver the minerals.