Changes

* Mind / [[Mind logic]]

* Soul / [[Soul strength]]

Different ore veins have different difficulties. The easiest is mining plain rock, followed by [[iron vein]]s and [[copper vein]]s. The hardest are silver and gold. As with most things in Wurm, too low difficulty leads to reduced skill gain, while too high difficulty results in high failure rate. A failure results in a 1.00 QL by-product.