look at the chunkloader from peripherals++, it should be able to be combined with a turtle to make a chunky turtle. (alternatively, search in NEI for chunky turtle and you can see how to make one)
As for mining scripts, a turtle is HORRIBLE at mining like a quarry due to its slow moving and turning speed and very limited inventory. Sure, its cheap but there are more effective ways to make a turtle mine, especially when you have access to chunky turtles and enderchests from the enderchest mod.
So, what is this better way of mining you may ask, well let me explain. This script uses a chunky turtle that will send all its items back to base and will forever and ever mine into 1 direction. The result? A mining machine that will mine forever. This means it won't waste time turning and it will *always be able to mine 3 blocks per time it moved. Because any moving action takes time being able to dig 3 times for each block is very important if you want your resources sooner rather then later.
However, this script comes at an cost as it will need some setup back at base. First off, you will need 3 enderchests. One will be used for the turtle to get fuel. Another one will be used to send items, the turtle will only deposit items into this chest if its empty and thus will only mine further if the chest is empty. The third enderchest is placed inside the turtle itself and the turtle will automatically switch to the correct color combination (it should be relative easy to reconfigure the set color codes if you want).
Note however that because you are still using a turtle resource collection will still be relative slow. However, if you are on a server DO NOT under any circumstance underestimate the amount of resources this thing can get you while you are sleeping and dreaming about the next thing to do on said server. So, without further delay,
here is the script (along with some details about how I set it up on that server)
*1: the random generation may make it so that it mines a bit less if no blocks are generated where this turtle wants to mine. Blame Notch for that one