http://www.spaceman.ca/blog/?p=235
http://blog.nwoolls.com/2013/04/24/bitcoin-mining-on-mac-os-x-cgminer-bfgminer/
At the moment working for Lion i have found is : Bitminter Java Client, GuiMiner using OpenCL miner, CPUminer using a Minerd.sh shell script to launch, and MacMiner but only the CPUminer option. I cannot get CGminer, BGminer, Diablo or Reaper to work for some odd errors like segmentation fault 11's,yadda yadda. I have a Radeon 5770 working and a older Radeon XT1900 I installed which shows in system profiler but unable to show up on any working Miners I have. Hoping to get Cgminer or BGminer up and running which may help recognize the XT1900 so please do let us know if you find a solution for 10.7 Lion. Been at it for a week with constant trial and error with going back and forth between Macports and Homebrew. All the guides for mining seems to be for Mountain Lion or 10.6 so us lion kids are left a little unsupported. Finally ended up uninstalling Macports and stuck with homebrew which seems to be the way to go. I was pulling some files out of system /usr folders to fix errors I was getting but ended up crashing the OS and having to rebuild it via OSX system restore disk. So just be careful in what you end up throwing down in the terminal but with much trial, error and dedication we will make it happen
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