"Searching for Cosmic Matter" at:
http://www.mtaonline.net/~hheffner/CosmicSearch.pdf
has been very slightly updated.
The most significant update: "We might be manufacturing cosmic matter
ourselves, in particle colliders. A proton-anti-proton collider may
manufacture just as much mirror matter as matter. It simply is not
detectable. A very small quantity of either kind of matter is
manufactured to be sure, but possibly a detectable quantity. It may
be of interest to attempt concentration of mirror matter from
collider target area parts that have been in service for a long time.
However, there is probably a much better chance of a find just
looking around at crater sites and checking rock temperatures. A
thermal imaging device of the type used for home insulation
inspections might be of special use in prospecting for mirror matter.
Rocks containing mirror matter will be darker than normal rocks in
the vicinity."
Horace Heffner
http://www.mtaonline.net/~hheffner/