so what about placing a mineral field on a geysier :D
the mineral field should still be able to be mined, but the geysier an only be used when those mineral field is completly mined.
so with this u can make a min-only to an gas expo after some time :D
might bring some interesting features, because zerg mine minerals far less fast than t/p, but gas IS the most important thing for z :D
or u can use low-value minerals on the geysier (f.e. on the gas in the main) so the tech will be slowed down a bit (or a lot, however^^)
Well, you can't build on geysirs either, but when it's a refinery, you suddenly can. It could be that you can always build on a geysir no matter what else is stacked on it. But I guess you are right ;)
Well, there have been a few maps where the geysir was boxed in behind a bunch of minerals, but those were not stacked on it. So your idea simply allows to place the CC/Nex/Hatch at a normal distance to the gas, and no walls on the other side of the geysir are required. Apart from that, the idea is not really new.
here, I made a lil map, where u have the mineralfield on geysier. I have uplaoded some rep aswell, and it shows, as Protoss, u can build an assimilator on both geysirs.