Two drilling technologies in the world

Before the fifth drill, you should add the equipment +4 and several pieces together. Sometimes even if you lose a few pieces, you will still make a profit. I have 12 blocks of 5 diamonds, and the daily drilling cost is about 200. Do you think you can make a profit? According to the price in my area, I spend 60% less on10.5 diamonds. It seems like a general character, because it won't be added in front, but it will be added with one or two or three pieces of equipment. As a result, I added about 40 yuan instead of 5 diamonds-! Twenty-four diamonds, one or two diamonds, and later excellent personality, 10 piece on three pieces.

As for the No.9 diamond, I agree with the second floor.