Maybe Cornwall Records Office can help you. I searched their Catalogue and this seems to be the beast:
http://crocat.cornwall.gov.uk/DServe/dserve.exe?dsqIni=Dserve.ini&dsqApp=Archive&dsqCmd=Show.tcl&dsqDb=Catalog&dsqPos=35&dsqSearch=%28%28text%29%3D%27heamoor%27%29 Their document ref number: FS/3/1634
They seem to have a facsimile .... so they might know who has the CD you're on about. They mention in there Peter Doe, who seems to have done all the visiting/checking/updating in 2005.
"Title Registry book, Penzance Cemetery, Wesley Rock, Heamoor, Madron
Date 1845-1907
Format Manuscript
Extent 2 pieces
Description Transcription of the Penzance Cemetery Proprietors' Registry book; cemetery by Wesley Rock Chapel, Heamoor, Madron, with plan of the burial ground, 1845-1907.
Admin History
Transcription of DC/PEN/190 with newly prepared plan of the cemetery, made in 2005, by Peter Doe prepared from a combination of the register and visits to the cemetery and examination of the headstones and layout. NB This Cemetery was opened by a private company in 1845 and is distinct from the much larger Penzance General Cemetery which was opened later and whose records are with Penwith District Council at the St Clare Council offices, Penzance and at the Cemetery itself."
