There were mine pits (as in Mine Pits Shaw, Mine Pits Field, Mine Pits Bottom, etc) and hammer ponds and pond bays.

There are quite a few springs and natural ponds/ boggy areas that may well be iron-stained too....I walked past several yesterday near Groombridge, Ashurst, Penshurst and Fordcombe (it was a fair old walk!).

Near Jarvis Brook I know of a couple of drying-out ponds (one a natural but erratic spring and one man-made which had been "puddled" to make it watertight but which had later deteriorated and mainly leaked away/ silted up)...but they're more over Town Row way than Jarvis Brook itself.