We explored Mulberry pit in the very early 70's and the tramming level/drain was full of water then as well, so no change in the last 40yrs. One or two short side levels and the under pass tunnel system through the main pit body were about it.

Mulberry is protected

County: Cornwall
Site Name: Mulberry Downs Quarry
District: North Cornwall
Status: Site of Special Scientific Interest (SSSI) notified under Section 28 of the Wildlife and
Countryside Act, 1981
Date Notified (Under 1949 Act): 1973
Date Notified (Under 1981 Act): 1985

This largest opencast working exposes the best example of a stockwork tin ore deposit in
Britain. The vein swarm trends generally in a north-north-east direction and the orebody is
described as ‘closely sheeted’. Individual veins in the killas are well seen in the sides and floor
of the deep working. They vary from minute cassiterite coated cracks up to veins 0.12 m in
width. The vein edges are greisenized and tourmaline replaces more argillaceous bands in the
killas for about 0.1 m from the vein walls. Cassiterite, arsenopyrite, wolframite and copper
minerals are present. The site is complementary to Cligga Head Mine in that it clearly shows
the effect of greisenisation on sediments rather than granite. This type of mineralisation cannot
be examined closely elsewhere except in the working tin mines. This high temperature
mineralisation is representative of the upper part of the tin zone and is of Hercynian age.