Both are indeed in tideswell dale on the left side as you descend down dale to miller's daleI'm sure I recognise the top one, but I can't remember exactly where it is. The bottom pic is Tideswell Dale Adit. A few tens of metres long to a short drop into a little chamber that might have been on a small scrin, but goes nowhere. I think they are both trials. I have been in both, but some years back now so memory hazy.
The top one is definitely Tideswell Dale Cave. Modified by miners it comes out in the side of a reasonably sized rift in a vein. A fair bit of water seems to sink in the bottom (on the right as you drop into the rift) - could repay digging. The bottom one is an un-named adit a few yards away, just a few feet long.Both are indeed in tideswell dale on the left side as you descend down dale to miller's dale