EDIT: At current prices you're looking more at 400k an hour at best.
Hello there! Here's a simple script for gathering Saltpetre from the salt mines at Great Kourend. There are no requirements for this except having a spade.
You can do this on a level 3, but your profits scale with your agility level as well as your mining level as you have a higher chance to get 2 blocks of salt.
Why do this? Because as of right now, saltpetre prices are high due to demand for Hosidius favor.
This is after 2 and a half hours of mining salt at 60 mining:
As you can see, it's not bad.
The script can be downloaded here:
https://www.dropbox.com/s/6xl2a8xfr2ak90x/PJSalt.jar?dl=0 (Updated for Deadman seasonal world changes, 6/28/2016).
And the source can be viewed here:
https://github.com/davidgao93/rs-loops/tree/master/PJSalt/src
It uses a simple node framework with very little anti-ban implemented (variable banking).
Don't run for extended amounts of time or run on throwaway accounts, level them up a bit to avoid detection please.
Expect profits to decrease as more people do this.
To start the script, go to the continent of Zeah, either via Port Sarim using Veos, or a Xeric's Amulet.
Start the script near this region:
Minimal testing was conducted - I don't use this script personally.
World hopping and stamina is supported, just check the box in the GUI if you wish to use them.
Happy digging. Feel free to ask any questions.