The Swallows, Amazons and Ds Mining Company is the owner of the Golden Gulch copper claim on High Topps. When they "stake" their claim in 1931 (PP21), Nancy writes "S.A.D. MINING COMPANY" until Roger asks "But why sad?". So the sign reads: S.A.D.M.C. / THIS GULCH IS CLAIMED / JUMPERS BEWARE / BY ORDER S.A.D.M.C. The idea of legally "Staking a Claim" comes from 19th century gold rushes in California, the Yukon, Australia and New Zealand; not from English law. The claim was later developed in to a mine by Jim Turner, Timothy Stedding and Slater Bob.