Rosevale Mine is situated on the northern edge of the exposed Lands End granite mass. The principle under-ground workings consist of two horizontal tunnels driven along a tin lode, named Red Lode, within the granite. The lode courses in an approximate SW to NE direction, is inclined steeply down to the SE and varies in width between 1-2 metres. The lower tunnel, No.2 Level, is approximately 270 metres long and the upper tunnel, No.1 Level, which lies 27 metres above No.2 level, is approximately 200 metres long. The tunnels are connected by a stope within which is a ladderway (constructed of fixed ladders and platforms) to enable access between the two levels. A 30 metre ventilation raise (shaft) in a stope near the end of No.1 level connects with surface.

A caunter lode, coursing in a NNE to SSW direction merges with Red Lode near the end of the two tunnels. Deep Adit Level has been driven along the caunter lode at a depth of 8 metres below No.2 Level. We believe this Deep Adit Level may originally have served to drain the workings of an old mine named Wheal Chance situated on the hillside to the southwest of the Red Lode workings. The entrance to Deep Adit Level lies close to the stream, but is choked; access into the adit is via ladders down a 23 metre deep shaft. There is a flooded connection between the Deep Adit Level and No.2 level close to the junction of the two lodes, but access to it is blocked by a substantial collapse 150 metres along the Deep Adit Level.

The workings contain a variety of features [photos]. The layout of the mine allows walk-in access and means that the mine is self-draining and has natural ventilation throughout the year (temperature circa 11°C).