Gleaned from the Internet to form my low expectations were the following locality descriptions: cleaned out; filled in; hard to collect; and strictly off-limits. I assumed that most of these descriptions had been posted subsequent to the April, 2003 date where Mindat noted the locality had been reopened. After spending about 90 minutes there, I found myself unable to either confirm or deny any of these contentions.
It was easy enough to locate. Route 27 descends a hill with road cuts on either side immediately north of the Halls Gap Motel. Where the road cut ends on the right is a pull-off where you can park. Everything that I collected came from within or the immediate vicinity of that parking area. Hereabouts was enough "geode material," to distract me for a half hour before venturing back to the road cut. Unless one counts the presence of snakes---I observed but one---there were no signs or obstructions to discourage me from collecting.
The cut is through shale. Nowhere in the road cut or amidst the talus beneath it did I observe any other kind of rock. Having since learned that the sulphide-bearing geodes were wedged into the shale in the road cut, it's possible I didn't look carefully enough. However, if the geodes were there, the work to dislodge them would have entailed more time than my schedule permitted.
Once again after the fact, word has reached me of other geode localities in the vicinity of Halls Gap. It has not include word regarding a presence of millerite or other sulphides.