I am near the end of the game, Johnson is waiting for me but I'm still short of nanoxanite and Verna's card. I've been thru the s/e caverns, helped the miner, got the sledgehammer and so forth. I've explored the s/e caverns thoroughly, tried to make a map that makes sense but still can't seem to find what I need. I've done the trick with jumping back on the mine cart when you originally go southeast multiple times, and from the posts I believe I have to jump off again when I am heading south towards the narrow tunnel (which I have done) but I cannot work out where to jump on again (if that is indeed what I have to do) I've tried heading for the high ledge but that doesn't seem to work. I know there is a lot of posts about this but can anyone help me please?