by Granger » Thu Oct 05, 2017 5:51 am
It may be cheaper to begin with mapping the local caves and to prospect the areas you can reach easily through them from above ground to locate any ore veins. Prospecting always queries one level below, cave entrances and surface mineholes lead you to the same level - being unable to mine (when the rock is to hard) starting in a cave is less frustrating than building a minehole into a such an hardness node.
Just make sure to be at full health so a cave-in (they increase in damage the deeper you go) will, while it can hurt you, not kill you. While breaking cave walls is a gamble without metal for supports, the minesweeper minigame enables you to figure out the unstable tiles to avoid...
⁎ Mon Mar 22, 2010 ✝ Thu Jan 23, 2020