From Runescape.com

Due to popular demand, it is now possible to mine and fish for longer without getting tired!

There are now two sort of rocks you can mine:

Soft rocks - These rocks spawn quite slowly, but they are easy to mine so you get very little fatigue from them. Mining these rocks is much like mining was originally before we changed it. You can easily get a full load of ore before you become too tired to mine.

Hard rocks - These use our new mining system for less repeat clicking. You can get the ore out of the rocks very quickly, and you can see it spawn so you aren't clicking blindly. However you will need to rest quite often when mining these rocks. For people who don't like clicking the same spot on the screen over and over you may find this way more fun.

We've also adjusted the fishing system. We considered introducing deep and shallow fish, but it doesn't work too well so instead we've just made the fish give a lot less fatigue than before, and spawn close to the original rate. This was what most players indicated they wanted.

One final note: We are aware that the numbers of soft and hard rocks may need balancing slightly. We will be keeping a close eye on this to make sure there are enough rocks of each type available. Depending on which rock type is most popular we may need to adjust the numbers slightly, so there is no need to ask us about this.