Why not spend money to upgrade warehouses in farms and mines?

Get SPAR-Buy Dwarves-Upgrade your own mines.

At first, each player will be given 1200 spar, so 100 spar will be mined first.

In this way, 1300 spar can recruit a dwarf.

With the green dwarf, the efficiency is doubled, and there are 2×3 mining opportunities. You will get a reward for mining your own mine once, and find someone else to mine high-grade mines for the other five times. Generally, you can mine more than 30 mines (you only have 20 mines at first).

Then recruit a dwarf when you have 1400 spar. Of course, there is a faster way to raise a few small ones, starting with two big ones. The big one can get 10% integral income.

At first, I went to other people's high-grade mining and recruited dwarves. When you have three dwarves, you can upgrade your mine and continue to recruit a fourth dwarf.