From eJahan Official Wiki

The other way to earn money, except work, is to explore mines. You need to search for this icon "explore mines" in “My places” section.

Click for more info on how to explore mines.

Before you reach 15 EP you can choose between two types of exploring. It is highly unprofitable to choose 2 hours option before you reach martial level 1 (35 EP), which allows you to recover your health in battles, due to the higher loss of wellness.

1 HOUR

2 HOURS

After you cross the boundary of 15 EP you have more types of exploring to choose. Up to 8 hours.

To earn tala for exploring you have to colled 1600/1600 in the section "Your advance in active sessions". The advance depends on the number of hours you spend on exploring your mine, the higher number the hours the higher is your advance, you also receive more EP (exp points) if you choose longer mining time. Section "Your total tries in active sessions" is very important for collecting "Lucky Miner" achievment, you need to collect 1600 explore points in less than 30 tries to obtain your lucky miner medal. "You will find xxx~xxx tala if you finish explore in this session" number of tala is random and depends only on the number of tries you perform before reaching the 1600 barrier.