I'd just keep the mule in 1 place, such as Draynor Bank.
Then, whenever you gathering account has above a specified amount "100 Gold ore" it goes to the bank, checks the gold ore quanitty, and if above 100 ores, withdrawls as note, and trades to "Muleusername" which is standing nearby.
Pretty simple.
If >100 ores
Withdrawl as note
Trade to "Username"
Dont need any clan chat keyword recognition lol.
And you mule is simple too, it just akfs at the bank, and deposits any items it gets traded.
Its important to be sure the mule only trades the exact username you specify.
So if your mule is
RuneKing7
Make sure it only trade RuneKing7.
Be sure it doesnt trade partial matches, such as 'RuneQueen7'