Well I have read all the threads on here about the thesaurus issues, I know you need to install the following packages:
mythes-en-us
openoffice.org-thesaurus-en-us
because they aren't installed with Libreoffice.
However once installed this did not do anything for me, still no thesaurus. I tried a lot of the fixes on the internet to no avail. I think my problem was my environmental settings which are British. For some reason Libreoffice wouldn't use the US thesaurus (apparently GB and US are subsumed into the same package). And as you know British isn't an English option for Libreoffice, despite English being from Britain...
Anyway the solution I found is this:
Open up a terminal and type and go to mythes directory:
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cd /usr/share/mythes
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sudo ln -s th_en_US_v2.dat th_en_GB_v2.dat && sudo ln -s th_en_US_v2.idx th_en_GB_v2.idx
Obviously if you want an actual British thesaurus and not one that just points to the US thesaurus then this may be an option for you: http://community.linuxmint.com/tutorial/view/579 though the package hasn't been updated in a while.
Its not perfect buts its better than what I had.
Hope this helps some people.
dao